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Literatura académica sobre el tema "PAEK Polymers"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 1 de febrero de 2022

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Artículos de revistas sobre el tema "PAEK Polymers"

Liu, Bei, Zheng Chen, Liming Lin, Yuntao Han, Jinhui Pang y Zhenhua Jiang. "Synthesis and characterization of poly(arylene ether ketone)s with 3,6-diphenyl-9H-carbazole pendants using C–N coupling reaction". High Performance Polymers 29, n.º 5 (29 de junio de 2016): 575–84. http://dx.doi.org/10.1177/0954008316655592.

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3,6-Diphenyl-9 H-carbazole pendants are grafted herein to poly(arylene ether ketone)s (PAEKs) via the Ullmann C–N coupling reaction. To the best of our knowledge, this is the first time that PAEKs containing a carbazole pendant (Cz) have been synthesized through the Ullmann C–N coupling reaction. The high molecular weights of PAEK-Cz (PAEKs with 3,6-diphenyl-9 H-carbazole pendants) are inherited from their precursors, owing to the high reactivity of their monomers. The obtained PAEK-Cz- x polymers exhibit good solubility in most common organic solvents and excellent thermal stabilities, with the 5% weight loss temperatures for all products being above 598°C under a nitrogen atmosphere. The glass transition temperatures are all above 199°C and can be controlled by adjusting the feed ratio of monomers. The polymer membranes obtained by the casting method are tough and thus have strong potential for practical applications.

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Alentiev, Alexandre, Sergey Chirkov, Roman Nikiforov, Mikhail Buzin, Oleg Miloserdov, Victoria Ryzhikh, Nikolay Belov, Vera Shaposhnikova y Sergey Salazkin. "Structure-Property Relationship on the Example of Gas Separation Characteristics of Poly(Arylene Ether Ketone)s and Poly(Diphenylene Phtalide)". Membranes 11, n.º 9 (31 de agosto de 2021): 677. http://dx.doi.org/10.3390/membranes11090677.

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Three poly(arylene ether ketone)s (PAEKs) with propylidene (C1, C2) and phtalide (C3) fragments, and one phtalide-containing polyarylene (C4), were synthesized. Their chemical structures were confirmed via 1H NMR, 13C NMR and 19F NMR spectroscopy. The polymers have shown a high glass transition temperature (>155 °C), excellent film-forming properties, and a high free volume for this polymer type. The influence of various functional groups in the structure of PAEKs on gas transport parameters was evaluated. Expectedly, due to the higher free volume, the introduction of the hexafluoropropylidene group to PAEK resulted in a higher increase of gas permeability in comparison with the propylidene group. The substitution of the fluorine-containing group on a rigid phtalide moiety (C3) significantly increases the glass transition temperature of the polymer, while the gas permeation slightly decreases. Finally, the removal of two ether groups from the PAEK structure (C4) leads to a rigid polymer chain that is characterized by the highest free volume, gas permeability, and diffusion coefficients among the PAEKs under investigation. Also, theoretically predicted transport parameters were investigated, to further study the structure–properties relationship for the PAEKs. Methods of modified atomic (MAC) and bond (BC) contributions were applied for this purpose (estimation of gas permeation and diffusion). Gas solubility coefficients for PAEKs were forecasted by the “Short polymer chain surface based prediction” (SPCSBP) method. Both the MAC and BC techniques showed reasonable predicted parameters for three polymers, while a significant underestimation of gas transport parameters was observed for C4. The results for all three prediction methods were compared with the experimental data obtained in this work. The predicted parameters were in good agreement with the experimental data for phtalide-containing polymers (C3 and C4), while for propylidene-containing poly(arylene ether ketone)s they were overestimated, due to a possible influence of the propylidene fragment on the indices of the oligomeric chains. MAC and BC methods demonstrated a better prediction power than the SPCSBP method.

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Jiang, Junqiao, Erli Qu, Min Xiao, Dongmei Han, Shuanjin Wang y Yuezhong Meng. "3D Network Structural Poly (Aryl Ether Ketone)-Polybenzimidazole Polymer for High-Temperature Proton Exchange Membrane Fuel Cells". Advances in Polymer Technology 2020 (14 de agosto de 2020): 1–13. http://dx.doi.org/10.1155/2020/4563860.

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Poor mechanical property is a critical problem for phosphoric acid-doped high-temperature proton exchange membranes (HT-PEMs). In order to address this concern, in this work, a 3D network structural poly (aryl ether ketone)-polybenzimidazole (PAEK-cr-PBI) polymer electrolyte membrane was successfully synthesized through crosslinking reaction between poly (aryl ether ketone) with the pendant carboxyl group (PAEK-COOH) and amino-terminated polybenzimidazole (PBI-4NH2). PAEK-COOH with a poly (aryl ether ketone) backbone endows superior thermal, mechanical, and chemical stability, while PBI-4NH2 serves as both a proton conductor and a crosslinker with basic imidazole groups to absorb phosphoric acid. Moreover, the composite membrane of PAEK-cr-PBI blended with linear PBI (PAEK-cr-PBI@PBI) was also prepared. Both membranes with a proper phosphoric acid (PA) uptake exhibit an excellent proton conductivity of around 50 mS cm-1 at 170°C, which is comparable to that of the well-documented PA-doped PBI membrane. Furthermore, the PA-doped PAEK-cr-PBI membrane shows superior mechanical properties of 17 MPa compared with common PA-doped PBI. Based upon these encouraging results, the as-synthesized PAEK-cr-PBI gives a highly practical promise for its application in high-temperature proton exchange membrane fuel cells (HT-PEMFCs).

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Sorokin, Anton E., Alexander P. Krasnov, Vera V. Shaposhnikova, Sergey N. Salazkin, Mikhail V. Gorshkov y Alexander V. Naumkin. "INTERACTION IN POLYARYLATE – POLY(ARYLENE ETHER KETONE) MIXTURE AT HIGH-TEMPERATURE PROCESSING". IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 62, n.º 8 (20 de agosto de 2019): 147–54. http://dx.doi.org/10.6060/ivkkt.20196208.5890.

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Methods of modifying polyarylate based on bisphenol A and mixture of iso- and terephthalic acids by a representative of a promising class of polymers — polyarylene ether ketone have been discussed in this article. Comparative thermomechanical and thermofriction tests of two grades of poly(arylene ether ketone)based on bisphenol A and 4,4'-difluorobenzophenone (PAEK-32 and PAEK-34) have been carried out. It has been established that PAEK-34 is the most suitable for modifying polyarylate, which is confirmed by its higher softening temperature and stable friction coefficient at elevated temperatures. The thermomechanical properties and molecular mass distribution of amorphous polyarylene ether ketone before and after pressing have been studied. It has been established that during processing of poly(arylene ether ketone) PAEK-34 it’s molecular weight increases from 123 to 178 thousand a.m.u. with simultaneous change in the character of the molecular mass distribution from bimodal to unimodal. At the same time, there is a sharp decrease in the content of the low molecular weight fraction from 23.32 to 7.2%. Theoretical compatibility of polyarethylene ether ketone PAEK-34 and polyarylate DV based on the theory of solubility of substances has been studied. It was established that mixtures of these polymers are compatible for any components’ ratio according to the calculation results. The thermomechanical characteristics of the mixtures obtained on the basis of polyarylate and polyarylene ether ketone have been evaluated. It has been established that the growth of heat resistance of the mixture during processing is caused by intermolecular interaction of components with the formation of new chemical compounds having a block-type copolymer structure. This was confirmed by the change in the nature of the molecular-mass distribution of the polymer mixture upon the transition of the pressing temperature from 260 °C to 300 °C. It was established that the optimal conditions for the realization of block-copolymer formation reaction are created at 300 °C.

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Salamov, Ali Kh, Abdulakh K. Mikitaev, Aues A. Beev, Julietti A. Beeva, Mukhamed Kh Ligidov y Sergey I. Pakhomov. "POLYARYLENEETHERKETONES OBTAINING WITH REACTION OF NUCLEOPHILIC SUBSTITUTION". IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 59, n.º 7 (17 de julio de 2018): 4. http://dx.doi.org/10.6060/tcct.20165907.5389.

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The article deals with the study of influence of the synthesis conditions on the molecular weight of polyaryleneetherketones (PAEK), received with nucleophilic substitution reaction of activated aryl halide. The synthesis of PAEK with the nucleophilic substitution reaction carried out as partially hydrolyzed homopolycondensation of phenolates and aromatic dihalides containing a carbonyl group in the molecule and derivatives of polycondensation of aromatic bisphenols with activated aromatic dihalides, and aromatic nitro compounds. The nucleophilic substitution of halogen in aryldihalogens proceeds through formation of Meisenheimer complex, where the negative charge of the electron-electron ring stabilizes the group. The high efficiency of the synthesis of PAEK with nucleophilic substitution reaction is mainly determined with several factors, the main of which are: 1) the structure of the starting monomers; 2) the nature of the solvent; 3) the nature of phenolate; 4) side reactions. For these materials it was revealed that the ratio of nucleophilic and electrophilic reagents has pronounced effect on the molecular weight of the obtained polymer, without affecting the poly dispersion. PAEK synthesis processes are optimized by controlling the replacement of some of the monomers, the temperature and concentration of reactants change. It was shown that the polyarylene ether ketones and copolymers have a high thermal heat resistance, mechanical properties. They show considerable heat resistance in air, capable of forming a transparent film and melts. Thus, data of literature review show that the nucleophilic substitution reaction is promising for PAEK synthesis of various chemical structures and produces polymers having valuable properties.

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Remanan, Manu, Rebbapragada Subba Rao, Shantanu Bhowmik, Lalit Varshney, Mathew Abraham y Karingamanna Jayanarayanan. "Hybrid nanocomposites based on poly aryl ether ketone, boron carbide and multi walled carbon nanotubes: evaluation of tensile, dynamic mechanical and thermal degradation properties". e-Polymers 16, n.º 6 (1 de noviembre de 2016): 493–503. http://dx.doi.org/10.1515/epoly-2016-0162.

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AbstractIn this study an attempt has been made to incorporate a radiation resistant filler like boron carbide (B4C) nanopowder along with multi walled carbon nanotubes (MWCNT) in a high performance polymer namely poly aryl ether ketone (PAEK) for potential applications in the nuclear industry. The dispersion of nanofillers in PAEK was established by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Infra red (IR) spectroscopy indicated the interaction between functionalized MWCNT (F-MWCNT) and PAEK. The optimum combination of B4C and F-MWCNT was obtained from the tensile property analysis. It was found from the dynamic mechanical analysis that the storage modulus of the composite at elevated temperature was enhanced by B4C inclusions. Mechanical damping factor spectra showed the shift of PAEK glass transition temperature to higher values due to the presence of B4C and F-MWCNT. Thermogravimetric analysis (TGA) presented the resistance offered by B4C to the degradation of PAEK especially at elevated temperatures.

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Zhang, Xingdi, Gang Liu, Guodong Dang, Weidong Li, Jindong Zhang, Hongwei Zhou, Chunhai Chen y Jianwen Bao. "Properties of carbon fibre/bismaleimide composites ex situ toughened with phosphorous-containing poly(arylene ether ketone) film". High Performance Polymers 29, n.º 5 (10 de junio de 2016): 533–43. http://dx.doi.org/10.1177/0954008316652464.

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To control the dissolution process of a phosphorous-containing poly(arylene ether ketone) (P-PAEK)/bismaleimide (BMI) resin diphase system, a series of P-PAEKs were synthesized by changing the molar ratio of the reactants through nucleophilic substitution. The U3160/BMI composites toughened with P-PAEK film were manufactured by resin transfer moulding based on the concept of ex situ toughening. In addition, the interlaminar properties of the composites were characterized by applying modes I and II fracture toughness tests. The mode I fracture toughness of the composite was shown to be less improved, whereas the mode II fracture toughness was increased by about 74%. Furthermore, the interlaminar microstructure, which was observed by using a scanning electron microscope (SEM), revealed that reaction-induced phase decomposition and inversion occurred in the interlaminar region. The improvement in fracture toughness was attributed to plastic rupture of the continuous P-PAEK phase and debonding or cavitations of the BMI particle phases. Through the application of ex situ toughening, the compression-after-impact properties of the composite were significantly improved, whereas the thermodynamic properties were well maintained. Besides, optical microscopy images showed more space in the interlayer of the toughened specimens, which contributed to the improvement of damage tolerance.

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Wang, Yongpeng, Mengzhu Liu, Dayong Lu y Haibo Zhang. "Electrospun porous hybrid CuO/CdO nanofibers using carboxylic-functionalized poly(arylene ether ketone)s as a template for glucose determination". High Performance Polymers 31, n.º 5 (12 de noviembre de 2018): 570–79. http://dx.doi.org/10.1177/0954008318811471.

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As a high performance polymer, PCA-poly(arylene ether ketone) (PAEK) was first used as a template to fabricate hybrid copper oxide (CuO)/cadmium oxide (CdO) nanofibers (NFs) via electrospinning and subsequent calcination. Porous NFs with a mean diameter of 463 nm were obtained. The formation of morphology was decided by the ion exchange reaction between the functional groups on polymer template and metal ions, which was proved by Fourier transform infrared spectra. Energy-dispersive X-ray spectrometer and X-ray powder diffractometry spectra demonstrated the obtained substance was CuO/CdO compound. The products were then investigated in detail for direct electrocatalytic oxidation of glucose, which was evaluated by cyclic voltammetry and chronoamperometry. Results revealed a similar anti-interference, higher sensitive, and faster response of glucose than the fibers produced from traditional template at +0.40 V. The improved performances were ascribed to the porous morphology which increased the surface-to-volume ratio. The porous morphology was found to be decided by the immobilization of metal ions onto PCA-PAEK. In conclusion, the functional group on PCA-PAEK side chain was the decisive factor to prepare CuO/CdO NFs with special morphology and good electrooxidation performances.

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Wang, Yongpeng, Pengtao Yan, Xintong Huo, Mengzhu Liu, Haibo Zhang y Zhenhua Jiang. "3D network super-hydrophobic hexafluorbisphenol A poly(aryl ether ketone) membrane prepared by one-step electrospraying". High Performance Polymers 32, n.º 10 (22 de junio de 2020): 1094–101. http://dx.doi.org/10.1177/0954008320930064.

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Novel super-hydrophobic poly(aryl ether ketone) (PAEK) membranes have been firstly prepared by modifying ordinary PAEK into hexafluorbisphenol A-PAEK through traditional nucleophilic condensation polymerization and subsequently simple electrospraying technique. With the solution concentration increased, the micromorphology exhibited nanofibers, nanofiber with spindles, 3D network with microspheres embedded, microspheres and dense films, successively. The static water contact angle increased from 99° to 155°, while the sliding angle from 1.3° to 6.8° (±1°), in which the 3D network presented the strongest super-hydrophobicity. After 200 h of water flushing, the rough surface structure and super-hydrophobicity of the membranes were well retained. Moreover, the membrane exhibited wonderful self-cleaning property, oil/water separation property, and stability due to the hierarchical micro/nanostructures. This work provides a new route for the creation of super-hydrophobic high performance engineering plastic fabrics with the potential values in large-scale application of filtration, oil/water separation, and antifouling.

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Dong, Bo, Shiyang Zhu, Ying Song, Shaowei Guan, Jinhui Pang y Zhenghua Jiang. "Synthesis of poly(arylene ether ketone) containing phenylsulfonic acid pendant for proton exchange membrane". High Performance Polymers 29, n.º 10 (26 de octubre de 2016): 1232–40. http://dx.doi.org/10.1177/0954008316674343.

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A series of phenylsulfonic acid–containing poly(arylene ether ketone) (psa-PAEK) were synthesized via polycondensation from 2-(4-methoxy)phenylhydroquinone and other commercial monomers, followed by postsulfonation approach under mild reaction conditions. Controlled substituted sites and the degree of sulfonation were realized using quantities of 2-(4-methoxy)phenylhydroquinone. Giving the psa-PAEK can be soluble in common organic solvents such as Dimethylsulfoxide, purity ≥99.5% (DMSO, Sinopharm Chemical Reagent Co., Ltd, Shanghai, China), NMP, 1-Methyl-2-pyrrolidinone purity ≥99.0% (NMP, Sinopharm Chemical Reagent Co., Lted, Shanghai, China), and N,N-dimethylacetamide, purity ≥99.0% (DMAc, Sinopharm Chemical Reagent Co., Lted, Shanghai, China). The tough and transparent polymer membrane was prepared by the solution casting method, which exhibited excellent mechanical properties and high proton conductivities. The tensile stress at maximum load and elongation at break of these membranes are 28.3–34.1 MPa and 101–126% in dry state, respectively. The proton conductivities of these membranes were higher than 10−2 S cm−1 at room temperature in water. Especially, the psa-PAEK-90 with ion exchange capacity of 1.62 mequiv. g−1 exhibited the proton conductivity of 176 mS cm−1 at 80°C in water. The clear microphase separation morphology was observed by small-angle X-ray scattering, which is a powerful evidence to explain their high conductive behaviors. These results suggest that the psa-PAEK membranes have great potential as a candidate membrane for proton exchange membrane fuel cell applications.

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Tesis sobre el tema "PAEK Polymers"

Rojo, Duran Sergio. "Synthèse d’ionomères par polycondensation directe de monomères fonctionnels". Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1294/document.

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Ce manuscrit de thèse décrit la synthèse et la caractérisation d'ionomères conducteurs protoniques pour une application en tant que membrane pour pile à combustible. La stratégie adoptée pour la synthèse de ces polymères repose sur la polycondensation directe de monomères fonctionnels. Pour ce faire, et dans le cadre d'un travail important de chimie organique, la synthèse de trois monomères sulfonés ainsi que de trois monomères phosphonés a été réalisée. Différents polymères perfluorés (polyperfluorocyclobutane (PFCB) et polyaryléthers (PAE) (Polyétheréther cétone (PEEK) et Polysulfone (PS), ont été obtenus par polycondensation directe de ces monomères fonctionnalisés. Il a été possible de synthétiser des copolymères séquencés (à blocs) et comportant un ou deux types de fonctions conductrices protoniques. Afin d'établir d'éventuelles relations structure-propriété pour ces polymères et l'influence du solvant dans la morphologie de la membrane, une étude de la morphologie a été réalisée à partir de plusieurs séries de polymères PAE et leurs analogues « statistiques ». Les valeurs de conductivité des polymères à blocs sont, en général, supérieures à celles de leurs analogues « statistiques ». Un PAE obtenu est particulièrement intéressant, il possède à la fois une conductivité (216 mS.cm 1) nettement supérieure au Nafion® et un gonflement plus faible. Le polymère perfluoré (PFCB) obtenu est également très prometteur : la conductivité enregistrée pour ce ionomères est de 138 mS/cm. Ce travail de thèse est, à notre connaissance, le premier exemple de synthèse d'un PFCB sulfoné par polymérisation directe d'un monomère fonctionnel mais il constitue également le premier exemple de synthèse de poly(aryléther)s à blocs sulfonés / phosphonés par copolymérisation directe de deux types de monomères fonctionnels
This thesis describes the synthesis and characterization of proton conducting polymers for application as membrane for fuel cells (PEMFC). The approach for the synthesis of polymers consists in creating polymers from direct polycondensation of functional monomers, in order to better control their final IEC. Three sulphonated monomers and three phosphonated monomers have been first synthetized. Different types of polyarylethers (one of them is both sulphonated and phosphonated) and one perfluorinated polymer (PFCB) have been synthetised by direct polycondensation of functional monomers. In order to explain the influence of the solvent in the final morphology of the membrane, and the relation between its structure and properties, one morphological study has been realized to the obtained polymers but also to their analogues “statistical” polymers. In general, the blocks polymers obtained the highest values of conductivity. One polyarylether seems particularly interesting, because its conductivity value is much higher than Nafion®’s, and has a smaller swelling value. The perfluorinated polymer has also an interesting conductivity value (138 mS/cm). This thesis work is, to the best of our knowledge, the first example of the synthesis of a sulphonated PFCB obtained by direct polycondensation but also the first example of synthesis of a both sulfonated/phosphonated polyarylethers by direct copolymerisation of to types of functional monomers

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Herblot, Martin. "Synthèse et caractérisation de monomères téléchéliques précurseurs de polymères thermostables de type PEKK". Thesis, Rouen, INSA, 2014. http://www.theses.fr/2014ISAM0009.

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Le développement d'une nouvelle voie de synthèse de poly(éther cétone cétone),polymères thermostables, a été étudiée pour des matériaux composites à matrice thermoplastique obtenus par le procédé de moulage par injection de résine RTM. Pour cela,nous nous sommes orientés vers une polymérisation par couplage réactif entre des monomères difonctionnels et des agents de couplage. Neuf monomères X-EKKE-X avec différentes extrémités réactives ont été synthétisés par acylation de Friedel-Crafts ou substitution nucléophile aromatique puis caractérisés structurellement et thermiquement.Des essais de couplage à partir de monomères à extrémités COOH sur des bisoxazoline sont permis la synthèse en masse de quatre polymères, semi-cristallins ou amorphes, de faibles masses molaires. A travers l'étude du comportement thermique de molécules modèles, une fragilité thermique à partir de 250°C a été mise en évidence pour ces polymères et attribuée au pont ester-amide entre deux unités EKKE
A new synthetic route to poly(ether ketone ketone), thermostable and semi-crystalline polymers, has been studied towards composite materials with a thermoplastic matrix obtained by a resin transfer molding process (RTM). This original synthesis was conducted by coupling reactions between difunctionals monomers and coupling agents. Nine X-EKKE-X monomers with different reactive extremities have been synthesized by Friedel-Crafts acylation or nucleophilic aromatic substitution. Thermal and structural properties were thoroughly investigated. Four polymers with semi-crystalline or amorphous morphologies and low molecular weights were obtained by coupling reactions between monomers with COOH functional extremities and bisoxazolines. Through the study of the thermal behavior of models molecules, a thermal fragility was highlighted for these polymers from 250°C and assigned to the amide-ester bridge between two EKKE units

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Ortega, Martínez Jorge. "Aplicación de las estructuras de PEEK para la confección de prótesis CAD-CAM implanto-soportadas. Estudio in-vitro". Doctoral thesis, Universitat Internacional de Catalunya, 2018. http://hdl.handle.net/10803/599760.

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El éxito de los implantes dentales a largo plazo ya es una realidad, pero seguimos teniendo complicaciones estéticas, biológicas y mecánicas. Por estos motivos la investigación avanza para descubrir nuevos materiales y aditamentos que nos permitan minimizar estas complicaciones. De las complicaciones más habituales que suceden posteriormente a la osteointegración de los implantes se encuentran: la microfiltración bacteriana y la fractura o aflojamiento de alguno de los componentes protésicos. En las prótesis cementadas se consideran como desventajas: la difícil retirada en caso necesario así como la inflamación periimplantaria por exceso de cemento subgingival. Los pilares protésicos de PEEK (Polieteretercetona) se utilizan en Implantología como pilares temporales. Están compuestos de un polímero del grupo polietercetona que en medicina ha sustituido en muchos casos, las prótesis ortopédicas de Titanio, como prótesis definitivas, por el módulo de elasticidad tanto parecido con el hueso humano. Los pilares PEEK son biocompatibles y pueden ser personalizados fácilmente en boca con el material rotatorio de clínica. Pueden presentar una translucidez y color similar a los dientes naturales. El propósito de este estudio es demostrar que los componentes protésicos y estructuras protésicas fabricadas CAD-CAM con PEEK pueden ser utilizadas como pilares directos definitivos sobre implantes, y así evitar las desventajas que presentan los pilares de titanio, considerados como el 'Gold Standard'. Dado que este material presenta ciertas limitaciones tales como la estética (en casos de biotipos gingivales delgados o recesiones), la adhesión de cementos o la personalización de los aditamentos en clínica.
L’èxit dels implants dentals a llarg termini ja és una realitat, però continuem tenint complicacions estètiques, biològiques i mecàniques. Per aquests motius la recerca avança per descobrir nous materials i aditaments que ens permetin minimitzar aquestes complicacions. De les complicacions més habituals que succeeixen posteriorment a la osteointegració dels implants es troben: la microfiltració bacteriana i la fractura o afluixament d´algun dels components protètics. En les pròtesi cimentades es consideren com a desavantatges: la difícil retirada en cas que sigui necessari així com la inflamació periimplantaria per excés de ciment subgingival. Els pilars protètics de PEEK (Polieteretercetona) s’utilitzen en Implantologia com a pilars temporals. Estan compostos d’un polímer del grup polietercetona que en medicina ha substituït en molts casos, les pròtesi ortopèdiques de Titani, com a pròtesi definitives, pel mòdul d’elasticitat tant semblant amb l’òs humà. Els pilars PEEK son biocompatibles i poden ser personalitzats fàcilment en boca amb el material rotatori de clínica. Poden presentar una translucidesa i color semblant a les dents naturals. El propòsit del nostre estudi es demostrar que els components protètics i estructures protètiques fabricades CAD-CAM amb PEEK poden ser utilitzades com pilars directes definitius a implants, i així evitar les desavantatges que presenten els pilars de titani, considerats com el ‘Gold Standard’. Donat que aquest material presenta certes limitacions tals com la estètica (en casos de biotips gingivals prims o recessions), la adhesió de ciments o la personalització dels aditaments en clínica.

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Mitton, Renata. "Tuning the Physical Properties of Poly(arylene ether)s Prepared from 3,5-Difluorobenzene Sulfonamides". Wright State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=wright1436957462.

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Park, Hyunji [Verfasser], Alexander [Akademischer Betreuer] Böker y Lothar [Akademischer Betreuer] Elling. "Glycopolymers with diverse applications : from common polymer brushes to novel lab-on-a-chip devices / Hyunji Park ; Alexander Böker, Lothar Elling". Aachen : Universitätsbibliothek der RWTH Aachen, 2015. http://d-nb.info/1129365298/34.

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Waweru, James Kanyoko. "Thermal Properties of Poly(arylene ether)s Prepared from N,N-Dialkyl-2,4-Difluorobenzenesulfonamides". Wright State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=wright1471687027.

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Andrejevic, Marina. "Functionalized Sulfone and Sulfonamide Based Poly(arylene ether)s". Wright State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=wright1402073837.

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Osegueda, Juan. "Synthèse et caractérisation de poly(aryl éther cétone amide)s". Thesis, Rouen, INSA, 2016. http://www.theses.fr/2016ISAM0022/document.

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Certaines applications (notamment dans l'aéronautique) demandent des polymères thermostables semi-cristallins avec des résistances et des températures de fonctionnement de plus en plus élevées (Tg supérieures à 170°C) tout en conservant de bonnes propriétés de mise en œuvre (Tf ne dépassant pas 350°C) aptes aux procédés industriels. Ce projet de thèse porte sur la synthèse et la caractérisation de nouveaux polymères hautes performances de type poly(aryl éther cétone amide)s à partir d'un monomère de type EKKE aux extrémités acide carboxylique. Ainsi, trois voies de synthèse des amides par condensation ont été étudiées : entre les acides carboxyliques et les isocyanates, entre les chlorures d'acyle et les amines, et entre les acides carboxyliques et les amines par phosphorylation. La comparaison des propriétés thermiques et leurs corrélations avec les structures chimiques des poly(aryl éther cétone amide)s aromatiques et semi-aromatiques obtenus sont particulièrement détaillées
Some demanding applications (especially in aerospace) require more and more semi-crystalline thermostable polymers with high temperature resistance and durability (Tg above 170 °C) while maintaining good processing properties (Tm not exceeding 350°C) suitable for industrial manufacturing.This work deals with the synthesis and characterization of new high performance poly(aryl ether ketone amide)s polymers from an EKKE monomer with carboxylic acid extremities. Thus, three amide condensation synthetic routes were studied: between carboxylic acids and isocyanates, between acyl chlorides and amines, and between carboxylic acids and amines by phosphorylation. The thermal properties and their correlation with the chemical structures of the obtained aromatic and semi-aromatic poly(aryl ether ketone amide)s are compared and especially detailed

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Zaake-Hertling, Haldor. "Poröse Koordinationspolymere mit Linkern auf Basis Polycyclischer Aromatischer Kohlenwasserstoffe". Doctoral thesis, Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-210415.

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Zusammenfassung In der vorliegenden Promotionsschrift werden Strategien zur Erzeugung von Linkermolekülen beschrieben, die geeignet sind, um als Bauelemente für sogenannte \"Metal-Organic rameworks\" (MOF) eingesetzt zu werden. Diese Stoffe bestehen aus einem organischen \"Linker\"-Teil, welcher die Metalleinheiten (\"Sekundäre Baueinheit\", SBU) miteinander verbindet, und dadurch die Entstehung von dreidimensionalen porösen Netzwerken ermöglicht. Dieses Projekt wurde an der Universität Leipzig in der Arbeitsgruppe von Prof. Dr. rer. nat. Dr. h.c. Evamarie Hey-Hawkins am Institut für Anorganische Chemie durchgeführt. Seit den frühen neunziger Jahren genießen MOFs großes Interesse aufgrund ihrer besonderen Eigenschaften als Festkörper mit wohldefinierter und permanenter Porosität. In der Einleitung dieser Promotionsschrift werden das Anwendungspotential oder bereits existierende Anwendungen für MOFs und verwandte poröse Feststoffe näher beschrieben. Mögliche Anwendungsgebiete sind unter anderem Gasspeicherung, Trennverfahren, zur Katalyse, in der Medizin und für Detektoren in der analytischen Chemie. Die Auswahl der organischen Baueinheiten für die Synthese von MOFs richtet sich nach Kriterien wie z.B. thermischer Stabilität, Geometrie der koordinierenden Einheiten, Rigidität des Linkermoleküls. Weiterhin können potentielle sekundäre Effekte berücksichtigt werden, z.B. Eignung für katalytische Prozesse, Ladungspufferung oder Lichtsammelvermögen. Alle Linker enthalten aromatische Einheiten; es werden Anthracen, Binaphthyl (verkörpert durch chirale BINAPO-Einheiten), Biphenyl, Pyren und Perylen als Mittelstück des Linkers eingesetzt. Die Promotionsschrift beleuchtet auch in einem Streifblick die Geschichte, das Vorkommen, mögliche Anwendungen und Giftigkeit von Molekülen mit polycyclischen aromatischen Kohlenwasserstoffgruppen. Die Synthese der Linker wurde mittels der folgenden Route realisiert: Bromierung der aromatischen Bestandteile und Anfügen von Endstücken (\"capper\") - welche die koordinierenden Einheiten enthalten - durch die Suzuki-Miyaura-Kupplung. Die Syntheserouten für den bromierten aromatischen Mittelteil des Linkers, die Boronsäuren und die vollständigen Linker, werden im experimentellen Teil beschrieben, und die erhaltenen Linker werden charakterisiert. Für den anorganischen Teil des MOF wurden außerdem ausgewählte komplexe Einheiten erzeugt, die als Startmaterialien für den sogenannten \"controlled SBU approach\" (CSA) dienen. Bei dieser Methode wird eine Baueinheit erzeugt, die der gewünschten eigentlichen Baueinheit im fertiggestellten MOF ähnlich ist und dann als Präkursor in der Synthese eingesetzt wird. Verschiedene Ansätze zur Erzeugung von MOFs wurden ausgeführt: Langsame Diffusion in Flüssigkeiten oder Gelen und vor allem Tempern der organischen und anorganischen Baueinheiten oder Startmaterialien in einem Lösungsmittel, teilweise unter solvothermalen Bedingungen. Mehrere Polymere wurden in einer zur Röntgenstrukturbestimmung geeigneten kristallinen Form erhalten. Die Strukturen werden in der vorliegenden Arbeit präsentiert und diskutiert. Ein Ausblick auf weiterführende Untersuchungen an diesen Verbindungen wird ebenfalls gegeben
Abstract This thesis describes approaches to obtain linker molecules that are suitable to build a so-called \"metal-organic framework\", MOF (or porous coordination polymer, PCP). These materials consist of an organic linker part that connects the metal units, \"secondary building units\" (SBU), with each other to form threedimensional, hollow networks. This project was performed at the University of Leipzig in the multinational workgroup of Prof. Dr. rer. nat. Dr. h.c. Evamarie Hey-Hawkins, at the Faculty for Inorganic Chemistry. These MOF materials have gained a lot of interest since the early 1990s for their special properties as solid materials with a well-defined, permanent porosity. The introductory part of this thesis elaborates potential or already current usage of MOF materials and related porous solids, such as gas storage, separation processes, catalysis, medical use and use in analytic detection. The choice of organic building blocks for the synthesis of MOFs followed certain criteria, such as thermal stability, geometry of coordinating units, rigidity of the linker molecule, and potential secondary effects such as suitability for catalytic purposes, charge buffering or light harvesting. All linkers feature aromatic units, and among the cores are moieties like anthracene, binaphthyl (represented by the chiral BINAP), biphenyl, pyrene and perylene. A glance is thrown on the history, occurrence, possible use and potential toxicity of molecules with polycyclic aromatic hydrocarbon moieties. Synthesis of the linkers is implemented by use of brominations of the aromatic core units and attaching capper units - carrying the coordinating units - by means of Suzuki-Miyaura-coupling. The synthesis routes to these molecules, brominated aromatic core, boronic acids and finished linkers, are described in the experimental part. The obtained linkers are characterised and described. Furthermore, selected complex units for the inorganic part of a potential MOF were created as starting materials for a so-called \"controlled SBU approach\" (CSA); wherein a building block, very similar to the desired unit in the final framework, is prepared and then used as a precursor in the synthesis. Various attempts at the generation of MOFs were conducted: Slow diffusion in liquids or gels, and, especially, reactions by tempering the organic and inorganic building blocks or starting materials in a solvent - partially also under solvothermal conditions. Several polymers were obtained in crystalline form, suitable for structure determination by X-ray crystallography. These structures are presented and discussed in this work, as well as the further research on these solids and the results being achieved

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Guenther, Johannes 1983. "Tridentate Phosphine Linkers for Immobilized Catalysts: Development and Characterization of Immobilized Rhodium Complexes and Solid-State NMR Studies of Polymers". Thesis, 2012. http://hdl.handle.net/1969.1/148059.

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The major directions of this thesis involve (1) the synthesis, immobilization, and characterization of tridentate phosphine linkers on silica, (2) the study of unprecedented Si2C bond cleavage in Rh and Ir phosphine complexes, and (3) the study of performance polymers with solid2state NMR techniques. First a brief overview of solid2state NMR and its relevance to the various areas of chemistry covered in this thesis is given. Following the synthesis, immobilization, and characterization of tridentate phosphine ligands, EtOSi[(CH2)nPPh2]3 (n = 4, 7, 11) and [MeP((CH2)nPPh2)3]+I? (n = 4, 7, 11) on silica is detailed. Both, immobilization by electrostatic interactions and by a covalent siloxane bond to the support, is studied and compared. Ligand exchange with Wilkinson?s catalyst affords immobilized Rh complexes. These materials are applied to catalytic olefin hydrogenation. In either case active hydrogenation catalysts are obtained that can easily and efficiently be recycled up to 30 times. Detailed investigations reveal that irrespective of the linkage to the support the catalysts consist initially of well2defined molecular species that form supported Rh nanoparticles with a narrow size distribution in the course of the catalytic reaction. The nanoparticles are active hydrogenation catalysts as well, and no metal leaching into solution is detected. The reaction of the tridentate phosphine ligands EtOSi[(CH2)2PPh2]3 and MeSi[(CH2)2PPh2]3 with Rh and Ir complexes is investigated. This reaction does not lead to the anticipated Wilkinson2type complexes with the metal in the +I oxidation state, but instead to oxidative addition of the C(sp3)2Si bond to Rh or Ir centers to yield octahedral complexes with the metal in the +III oxidation state. These complexes are fully characterized by multinuclear NMR in solution and in the solid state. Preliminary density functional theory (DFT) calculations corroborate the preference for oxidative addition. Subsequently the study of performance thermoplastics which are important materials for the oil and gas industry is presented. The polymer morphology is studied by solid2state NMR techniques. Special attention is devoted to potential decomposition pathways at elevated temperatures for polyetheretherketone (PEEK) and polyphenylene sulfide (PPS) polymers. 13C CP/MAS (cross polarization with magic angle spinning) NMR and IR spectroscopy reveal that PEEK polymers show no detectable chemical change on the molecular level, while PPS polymers display signs of oxidation of the thioether group and branching via formation of ether, thioether, and biphenyl linkages. Furthermore, the water absorption of polybenzimidazole (PBI), polyetherketoneketone (PEKK), and their blend PEKK2PBI is studied. It is demonstrated that steam2treatment even at high temperatures and pressures does not cause chemical decomposition and that the changes, which are morphological in nature, are fully reversible.

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Libros sobre el tema "PAEK Polymers"

Robb, Tom. Pack up and paint with oils. New York: A.A. Knopf, 1987.

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Pack up and paint with oils. London: Collins, 1986.

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Polymer Processing, Automation'86 (Conference) (Esher). Polymer Processing, Automation '86: The Plastics and Rubber Institute second international conference and exhibition on competitive manufacturing systems, Sandown Park, Esher, Surrey, Wednesday 25 and Thursday26 June 1986. London: The Institute, 1986.

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(conference), Competitive manufacturing systems. Polymer processing: Automation '86 : second international conference and exhibition on competitive manufacturing systems, 25-26 June 1986, Sandown Park, Esher, Surrey. London: Plastics and Rubber Institute, 1986.

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Non-Fiction. Pack Up & Paint Oils Acrylics. HarperCollins Publishers, 1986.

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Institute, Plastics and Rubber, ed. Polymer Processing, Automation '86: The Plastics and Rubber Institute second international conference and exhibition on competitive manufacturing systems, Sandown Park, Esher, Surrey, Wednesday 25 and Thursday 26 June 1986. London: The Institute, 1986.

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Capítulos de libros sobre el tema "PAEK Polymers"

Gooch, Jan W. "Pack". En Encyclopedic Dictionary of Polymers, 515. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_8354.

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Gooch, Jan W. "Screen Pack". En Encyclopedic Dictionary of Polymers, 649. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_10358.

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Gooch, Jan W. "Pack Life". En Encyclopedic Dictionary of Polymers, 515. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_8359.

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Gooch, Jan W. "PAK". En Encyclopedic Dictionary of Polymers, 516. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_8379.

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Gooch, Jan W. "Extruder Screen Pack". En Encyclopedic Dictionary of Polymers, 288. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_4711.

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Steiner, G. y C. Zimmerer. "Poly(aryl ether sulfone) (PAES)". En Polymer Solids and Polymer Melts – Definitions and Physical Properties I, 953–60. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-32072-9_107.

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Wypych, George. "PAEK polyaryletherketone". En Handbook of Polymers, 260–61. Elsevier, 2016. http://dx.doi.org/10.1016/b978-1-895198-92-8.50081-1.

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Wypych, George. "PAEK acrylonitrile-butadiene-acrylate copolymer". En Handbook of Polymers, 253–54. Elsevier, 2012. http://dx.doi.org/10.1016/b978-1-895198-47-8.50080-1.

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"Pack". En Encyclopedic Dictionary of Polymers, 691. New York, NY: Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-30160-0_8213.

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"Pack life". En Encyclopedic Dictionary of Polymers, 691. New York, NY: Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-30160-0_8218.

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Actas de conferencias sobre el tema "PAEK Polymers"

Geslin, Alexis, Clément Paul, Philippe Bussi, Robert Barsotti, Jonathon Hollahan y Mary Calvin. "PEKK Poly Ether Ketone Ketone for High Temperature High Pressure Oil & Gas Conditions". En Offshore Technology Conference. OTC, 2021. http://dx.doi.org/10.4043/30987-ms.

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Abstract Poly Aryl Ether Ketones (PAEK), and in particular Poly Ether Ether Ketone (PEEK), have established themselves as polymers of choice for extreme environments. This is especially true in the Oil & Gas industry, with its very harsh conditions (high temperatures, high pressures and corrosive fluids). Within the PAEK family, Poly Ether Ketone (PEK) and Poly Ether Ketone Ether Ketone Ketone (PEKEKK) were later introduced to address the need for higher mechanical and thermal properties than PEEK; unfortunately, their chemical resistance has been reported as not matching that of PEEK. In this paper, we report on novel, high viscosity, Poly Ether Ketone Ketone (PEKK) polymers that combine PEEK-like processing, high mechanical performances, barrier properties and very good chemical resistance in the NORSOK M710 test, positioning PEKK as a strong candidate for demanding Oil & Gas applications, such as O-rings, seals or electrical connectors.

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Underdown, D. R., A. L. Calvert y D. P. Newhouse. "Comparison of HEC and XC Polymer Gravel Pack Fluids". En SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers, 1989. http://dx.doi.org/10.2118/19751-ms.

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Bach, T., K. E. Wennberg, A. Mebratu, W. P. Hendriks, J. M. Warren y T. Rolfsvaag. "Polymer Sealant for Unwanted Gas in Openhole Gravel-Pack Completion". En SPE European Formation Damage Conference. Society of Petroleum Engineers, 2001. http://dx.doi.org/10.2118/68975-ms.

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Angstadt, David C., John P. Coulter y Ryan Hydro. "Strength Enhancement of Styrene Acrylonitrile Co-Polymer via Delay Pack Injection Molding". En ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-81615.

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This study investigates the effects of processing of styrene acrylonitrile (SAN) by injection molding using a delayed packing stage. The concept of Delay Pack Injection Molding (DPIM) evolved from an in-situ study of vibration-assisted injection molding (VAIM) which indicated that the beneficial effects of VAIM came not from the vibration itself, but rather from the delay in the onset of packing resulting from the application of the vibration. Conceptually, DPIM involves normal filling of the mold immediately followed by a slight retraction of the injection screw for a specified time period before the final packing pressure is applied. Application of DPIM results in increased birefringence in the molded parts and increases in the ultimate tensile strength of molded parts very similar to the effects seen using VAIM. A parametric study using a design of experiments framework was carried out to determine the delay pack parameters affecting SAN and resulted in a maximum increase in UTS of 11.6%. Observation of birefringence patterns in Delay Pack processed samples shows a significant impact on molecular orientation while observation of failed specimens and their fracture surfaces shows distinctly different modes of crack growth and failure. Growth of craze cracks resulting from tensile loading appeared to be arrested by oriented areas surrounding the part core allowing the specimen to sustain higher loads relative to conventionally molded parts. All of the above observations are consistent with the observed effects of vibration-assisted injection molding.

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Mack, David J. "Effects of Proppant Pack Concentration and Polymer Residue on Appalachian Stimulations". En SPE Eastern Regional Meeting. Society of Petroleum Engineers, 2000. http://dx.doi.org/10.2118/65626-ms.

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Choi, Chi-Hoon, Jeong-Min Cho, Yongkil Kil y Yonghoon Yoon. "Development of Polymer Composite Battery Pack Case for an Electric Vehicle". En SAE 2013 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2013. http://dx.doi.org/10.4271/2013-01-1177.

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Harmona, John, Hongyi Li, Shujun Tang, Celina Mikolajczak y Ming Wu. "Pre-manufacture safety analysis: Battery cell responses to simulated pack and system impact loading". En 2008 IEEE Interdisciplinary Conf on Portable Info Devices (PORTABLE) - Polytronic 2008 IEEE Conf on Polymers and Adhesives in Microelectronics and Photonics. IEEE, 2008. http://dx.doi.org/10.1109/portable-polytronic.2008.4681263.

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Condro, Peter Jacob, Robert Prins y Curtis Hendrick. "Design and construction of a modular 155V 40Ah lithium polymer tractive battery pack". En 2018 Systems and Information Engineering Design Symposium (SIEDS). IEEE, 2018. http://dx.doi.org/10.1109/sieds.2018.8374755.

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Liu, Yiqun, Y. Gene Liao y Ming-Chia Lai. "Temperature Distribution on Lithium-ion Polymer Battery: From 12V Module to 48V Pack". En 2020 IEEE Transportation Electrification Conference & Expo (ITEC). IEEE, 2020. http://dx.doi.org/10.1109/itec48692.2020.9161651.

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Pankonien, Alexander M. y Zoubeida Ounaies. "Piezoelectric Artificial Kelp for Energy Harvesting". En ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2010. http://dx.doi.org/10.1115/smasis2010-3881.

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This study focuses on a hydrokinetic energy harvesting system concept using piezoelectric materials. The Piezoelectric Active Kelp (PAK) system will consist of chemically inert piezoelectric polymers or piezoelectric ceramics manufactured into long flexible ribbons. The PAK system will convert the natural mechanical motions seen in kelp forests due to oceanic wave action, into electricity. As the periodic ocean currents, resulting from waves, pass over the PAK system, they cause the structure to oscillate back and forth. The piezoelectric materials will convert this mechanical motion directly into electrical power via the inverse piezoelectric effect. Large numbers of piezo-kelp ribbons would be mounted like forests on the ocean floor, producing a constant stream of smart grid power. PAK forest systems would also provide an artificial marine habitat while meeting the world’s demand for inexpensive and sustainable energy. Contrary to most forms of hydrokinetic energy harvesting system, the PAK system has no fast-moving parts or turbines and will be made of environmentally inert materials. The amount of power harvested by the PAK system depends upon the flow conditions, device configuration and size, and its piezoelectric material properties. Assuming specific flow conditions and fluid-structure interaction, this study will determine the optimal piezoelectric material to use, along with physical dimensions and layup configuration, to maximize the volumetric power density of the PAK system. The power generated by three common piezoelectric energy harvesting configurations: the unimorph, a homogeneous bimorph and a heterogeneous bimorph, will be compared for both a piezopolymer and a piezoceramic. Additionally, an appropriate figure-of-merit is also identified, based on the piezoelectric coefficient product (d31· g31) to compare the power production capabilities across materials.

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