Relevant bibliographies by topics / Polycondensation catalist

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Academic literature on the topic 'Polycondensation catalist'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 June 2024

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Journal articles on the topic "Polycondensation catalist"

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Guan, Zhenyu, Jialong Zhang, Wenle Zhou, et al. "Mechanistic Details of the Titanium-Mediated Polycondensation Reaction of Polyesters: A DFT Study." Catalysts 13, no. 10 (2023): 1388. http://dx.doi.org/10.3390/catal13101388.

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In this work, the mechanism of polyester polycondensation catalysed by titanium catalysts was investigated using density functional theory (DFT). Three polyester polycondensation reaction mechanisms, including the Lewis acid mechanism (M1), the coordination of the ester alkoxy oxygen mechanism (M2) and the coordination of the carboxy oxygen mechanism (M3), were investigated. Three reaction mechanisms for the polycondensation reaction of diethyl terephthalate (DET) were investigated using Ti(OEt)4 and cationic Ti(OEt)3+ as the catalyst. The results show that the polycondensation reaction of the
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Pospiech, Doris, Renata Choińska, Daniel Flugrat, et al. "Enzymatic Synthesis of Poly(alkylene succinate)s: Influence of Reaction Conditions." Processes 9, no. 3 (2021): 411. http://dx.doi.org/10.3390/pr9030411.

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Application of lipases (preferentially Candida antarctica Lipase B, CALB) for melt polycondensation of aliphatic polyesters by transesterification of activated dicarboxylic acids with diols allows to displace toxic metal and metal oxide catalysts. Immobilization of the enzyme enhances the activity and the temperature range of use. The possibility to use enzyme-catalyzed polycondensation in melt is studied and compared to results of polycondensations in solution. The experiments show that CALB successfully catalyzes polycondensation of both, divinyladipate and dimethylsuccinate, respectively, w
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Hwang, Sung Yeon, Dong Yeop X. Oh, and Je Young Park. "Synthesis of High Molecular Weight Poly(L-Lactic Acid)s by Direct Polycondensation with Organic Acids as Catalyst." Key Engineering Materials 773 (July 2018): 25–29. http://dx.doi.org/10.4028/www.scientific.net/kem.773.25.

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In this study, high molecular weight (HMW) poly (l-lactic acid)s (PLLAs) were synthesized by direct polycondensation using organic acid catalysts alone in a nitrogen-controlled environment. The melting point and enthalpy of the pre-polymer produced by melt polycondensation increased as molecular weight grew during solid-state polycondensation. It was observed that the nitrogen-controlled external environment had lower molecular weight than air, but the low molecular weight tail was significantly reduced, as indicated by gel permeation chromatography. This is because it inhibited the reverse re
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Ochiai, Bungo, and Yuriko Kobayashi. "Non-Isocyanate Synthesis of Aliphatic Polyurethane by BiCl3-Catalyzed Transurethanization Polycondensation." Polymers 16, no. 8 (2024): 1136. http://dx.doi.org/10.3390/polym16081136.

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Non-isocyanate polyurethane synthesis by non-Sn catalysis is an essential challenge toward green polyurethane synthesis. Bismuth compounds are attractive candidates due to their low cost, low toxicity, and availability to urethane chemistry. This work applied various Bi catalysts to the self-polycondensation of a bishydroxyurethane monomer and found BiCl3 to be an excellent catalyst through optimization. The catalytic activity and price of BiCl3 are comparable to those of Bu2SnO, while its toxicity is significantly low. BiCl3 is, therefore, a promising alternative to Sn-based catalysts in non-
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Zou, Wenqi, Hongli Bian, Jinjing Guo, Jun Xu, and Baohua Guo. "Preparation of Titania–Silica Composite Aerogel at Atmospheric Pressure and Its Catalytic Performance in the Synthesis of Poly (Butylene Succinate)." Materials 16, no. 9 (2023): 3296. http://dx.doi.org/10.3390/ma16093296.

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Titanates are widely used in the synthesis of polyesters, such as Poly (butylene succinate) (PBS), due to their excellent catalytic activity for polycondensation. However, the hydrolysis sensitivity of titanate and side reactions at high temperatures restrict the further improvement of the molecular weight of polyesters and lead to the high content of end carboxyl group content in the products. In this work, we prepared titania–silica composite aerogels with resistance to hydrolysis and large specific surface area, which were further explored as an efficient catalyst for polycondensation react
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Sui, Aiguo, Xincui Shi, Yongxia Wang, Yanhou Geng, and Fosong Wang. "Kumada catalyst transfer polycondensation for controlled synthesis of polyfluorenes using 1,3-bis(diarylphosphino)propanes as ligands." Polymer Chemistry 6, no. 26 (2015): 4819–27. http://dx.doi.org/10.1039/c5py00610d.

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Duan, Haonan, Zanyao Niu, and Xiaoqi Yang. "Physical Properties of Cyclic Esters and its Application in Heterogeneous Electrocatalysis." Journal of Physics: Conference Series 2083, no. 2 (2021): 022083. http://dx.doi.org/10.1088/1742-6596/2083/2/022083.

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Abstract Oxygen reduction is a key reaction in many energy conversion devices. Phosphorus-containing porous organic polymers not only have developed pores and surface structure, but also have strong adjustable modification and modification, so they have a wide application prospect in heterogeneous catalysis. At present, the preparation of phosphorus-containing porous organic polymers and their applications in heterogeneous catalysis have not been reviewed. in this paper, the research progress in this field in the past decade is summarized and reviewed. The synthetic methods of phosphorus-conta
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El Fray, Miroslawa, Michal Rybko, and Agnieszka Piegat. "Silica-Polyester Nanocomposites Prepared by Polycondensation In Situ: Synthesis and Mechanical Properties." Materials Science Forum 714 (March 2012): 277–82. http://dx.doi.org/10.4028/www.scientific.net/msf.714.277.

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New multiblock polymer-matrix nanocomposites were prepared by the in situ polycondensation. Polymers containing 30% hard segments of poly (butylene terephthalate) (PBT) and 70% soft segments built up from dimerized fatty acid (DLA), were modified with silica nanopowder. The nanocomposite materials were prepared by polycondensation in situ with the use of two different catalysts. Two types of nanosilica (Evonic Aerosil R 972 hydrophobic, and Aerosil 130 - hydrophilic) in amount of 0.1, 0.2 and 0.3 wt. % were used. Physical and mechanical properties were examined. The results indicate a strong i
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Hong, Chae Hwan, Si Hwan Kim, Ji-Yeon Seo, and Do Suck Han. "Development of Four Unit Processes for Biobased PLA Manufacturing." ISRN Polymer Science 2012 (March 15, 2012): 1–6. http://dx.doi.org/10.5402/2012/938261.

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Polylactide (PLA), which is one of the most important biocompatible polyesters that are derived from annually renewable biomass such as corn and sugar beets, has attracted much attention for automotive parts application. The manufacturing method of PLA is the ring-opening polymerization of the dimeric cyclic ester of lactic acid, lactide. For the stereocomplex PLA, we developed the four unit processes, fermentation, separation, lactide conversion, and polymerization. Fermentation of sugars to D-lactic acid is little studied, and its microbial productivity is not well known. Therefore, we inves
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Babić, B., Velimir Radmilović, N. Krstajić, and B. Kaludjerović. "Electrooxidation of Hydrogen on Nanostructured Pt/C Catalysts for Polymer Electrolyte Fuel Cells." Materials Science Forum 518 (July 2006): 283–88. http://dx.doi.org/10.4028/www.scientific.net/msf.518.283.

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Mesoporous carbon cryogel synthesized by sol-gel polycondensation and freeze-drying with specific surface area (BET) of 517 m2 g-1 was used as a catalyst support. Pt/C catalysts were prepared by a modified ethylene glycol method (EG). Transmission electron microscopy (TEM) images show that the dispersion of the catalyst is very uniform with a mean particle size of about 2.65 nm. Hydrogen oxidation reaction (HOR) was studied on Pt/C catalyst in 0.5 mol dm-3 HClO4 acid solution. It has been found that HOR appears as a reversible two-electron direct discharged reaction (Tafel slope for this react
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Dissertations / Theses on the topic "Polycondensation catalist"

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Laubie, Baptiste. "Dégradation bio-physico-chimique des élastomères silicones : Influence du catalyseur de polycondensation et impacts environnementaux." Thesis, Lyon, INSA, 2012. http://www.theses.fr/2012ISAL0095/document.

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Le classement de la famille des dibutylétains par l’Union Européenne comme reprotoxique et mutagène conduit les fabricants d’élastomères silicones à développer des solutions de remplacement de ces composés, largement employés comme catalyseur de réticulation. L’augmentation grandissante de la consommation de ce type d’élastomères amène à s’interroger sur leurs impacts dans les filières de traitement des déchets et sur l’influence du changement de catalyseur sur leur comportement environnemental. Ce domaine de recherche, très peu exploré, demande la mise en place d’une méthodologie spécifique,
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Laubie, Baptiste. "Dégradation bio-physico-chimique des élastomères silicones : Influence du catalyseur de polycondensation et impacts environnementaux." Electronic Thesis or Diss., Lyon, INSA, 2012. http://www.theses.fr/2012ISAL0095.

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Le classement de la famille des dibutylétains par l’Union Européenne comme reprotoxique et mutagène conduit les fabricants d’élastomères silicones à développer des solutions de remplacement de ces composés, largement employés comme catalyseur de réticulation. L’augmentation grandissante de la consommation de ce type d’élastomères amène à s’interroger sur leurs impacts dans les filières de traitement des déchets et sur l’influence du changement de catalyseur sur leur comportement environnemental. Ce domaine de recherche, très peu exploré, demande la mise en place d’une méthodologie spécifique,
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Monakhova, Julia. "Valorisation du glycérol par polycondensation catalytique." Thesis, Montpellier, Ecole nationale supérieure de chimie, 2012. http://www.theses.fr/2012ENCM0012/document.

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Ce travail de thèse s'inscrit dans le cadre de la valorisation du glycérol par polycondensation catalytique. L'objectif est l'obtention de nouveaux catalyseurs basiques hétérogènes actifs et sélectifs pour effectuer la polycondensation directe du glycérol en polymères contenant plus de 5 unités monomères, tout en évitant les sous-produits toxiques (acroléine) et les polymères cycliques. Des précurseurs de catalyseurs associant le lanthane et les différents cations alcalino-terreux ont été obtenus par co-précipitation conventionnelle ou par une voie originale utilisant des ionogels bi-cationiqu
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Lusardi, Marcella R. (Marcella Rose). "Acid-base catalysts for polycondensation of acetaldehyde in flow." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/101563.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2015.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 71-74).<br>Acetaldehyde is used as a bio-oil model compound in a polycondensation reaction over two acid-base catalysts, pelletized Evonik P25 TiO₂ and an activated hydrotalcite-like compound (HTlc), to produce high molecular weight molecules in the transportation fuel range. The catalytic performance of these materials is evaluated in a gas phase, atmospheric flow system with a packed bed microreactor
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Vaugeois, Yann. "Synthèse et activité catalytique de nouveaux catalyseurs supportés à base de phosphazènes pour la polycondensation des silanols." Lille 1, 2000. https://pepite-depot.univ-lille.fr/RESTREINT/Th_Num/2000/50376-2000-500.pdf.

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L'objectif de ce travail était de préparer et d'étudier l'activité catalytique de nouveaux catalyseurs supportés à base de phosphazènes pour la polycondensation des silanols. Cette étude a été menée en deux étapes. La première a consisté à étudier l'activité catalytique de composes chlorophosphazenes (oligophosphazenes, cyclophosphazenes et polyphosphazenes) en phase homogène, dans les réactions de redistribution et de condensation des siloxanes. Ceci a permis de mieux comprendre les mécanismes réactionnels mis en jeu et de déterminer par la suite le meilleur composé susceptible d'être greffé
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Montagne, Fabienne. "Les sels de terres rares en catalyse hétérogène des réactions de Friedel-Crafts : applications en polycondensation." Dijon, 1997. http://www.theses.fr/1997DIJOS033.

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En chimie fine, le réactif universel des réactions d'alkylation et d'acylation de composés aromatiques selon Friedel-Crafts est le trichlorure d'aluminium mais l'emploi de cet acide de Lewis présente plusieurs inconvénients : la réaction est au mieux stoechiométrique, le réactif est d'un usage unique et les effluents sont nuisibles à l'environnement. Les sels de terres rares déposés sur un support minéral sont d'excellents catalyseurs des réactions de Friedel-Crafts ; leur activité catalytique est nettement plus élevée que celle des chlorures de terres rares et leurs analogues coordonnés non s
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Com, Dominique. "Contribution à l'étude de la réaction de polycondensation phénol-epoxy par catalyse par transfert de phase." Paris 6, 1986. http://www.theses.fr/1986PA066031.

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BEN, ROMDHANE HATEM. "Polythioethers de pyridine obtenus par polycondensation par catalyse par transfert de phase : precurseurs de reseaux thermostables." Paris 6, 1989. http://www.theses.fr/1989PA066045.

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La polycondensation de la dibromo-2,6 pyridine avec le sulfure de sodium et le sel dipotassique du dimercapto-2,5 thiadiazole-1,3,4 a ete effectuee dans des conditions de catalyse par transfert de phase solide-liquide. Des conditions operatoires permettant de preparer des polythioethers bien definis possedant des groupements brome a chaque extremite ont ete mises au point. La formation d'un trimere cyclique a ete mise en evidence dans certains cas. Ces composes ont ete caracterises par analyse elementaire, spectroscopie ir, rmn du proton et du carbone 13, chromatographie par exclusion sterique
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Com, Dominique. "Contribution à l'étude de la réaction de polycondensation phénol-époxy par catalyse par transfert de phase." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb37596797n.

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DE, LEUZE AGNES. "Oligomeres fonctionnels a base de pyridines et bipyridines, obtenus par polycondensation par catalyse par transfert de phase." Paris 6, 1993. http://www.theses.fr/1993PA066152.

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Des polythioethers et polyethers a base de pyridine et bipyridine ont ete obtenus par polycondensation par catalyse par transfert de phase (ctp). La polycondensation de la 2,6-dibromopyridine avec le sulfure de sodium par ctp solide-liquide a ete etudiee. Le degre d'hydratation du sulfure de sodium a une tres grande influence sur la reaction. On obtient des cycles pour un pourcentage en eau inferieur a 5% et des derives lineaires lorsque ce pourcentage est compris entre 15 et 35%. Une etude cinetique a montre que ces reactions sont d'ordre deux par rapport a la concentration en 2,6-dibromopyri
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Books on the topic "Polycondensation catalist"

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Umaba, Toshikatsu. Polycondensation Catalyst for Producing Polyester and Method for Producing Polyester Using the Same: United States Patent. Independently Published, 2020.

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Book chapters on the topic "Polycondensation catalist"

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Kobayashi, Shiro, and Hiroshi Uyama. "Synthesis of Polyesters I: Hydrolase as Catalyst for Polycondensation (Condensation Polymerization)." In Green Chemistry and Sustainable Technology. Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-3813-7_5.

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Gauron, V., B. Jousseaume, M. Pereyre J. B. Verlhac,, and J. M. Frances. "How silicon and tin meet in polymer and organic synthesis." In Chemistry and Technology of Silicon and Tin. Oxford University PressOxford, 1992. http://dx.doi.org/10.1093/oso/9780198555803.003.0017.

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Abstract The organic chemistry of silicon and tin has gained much significance in recent years on both academic and industrial grounds. At Bordeaux, we have been involved in research where both silicon and tin have featured synergistically. Two examples are presented in this paper. The first topic deals with polymer science and describes the preparation and the applications of new latent organotin catalysts for the reticulation of polyorganosiloxane chains (SiOH/SiOR and SiOH/SiH polycondensations). The underlying principle is to use bis(2-acyloxyalkyl)diorganotins, which are themselves not catalysts, but which are thermally degraded through a J3-elimination process into diorganotin dicarboxylates, an important class of commercial catalysts.
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Tan, Loon-Seng. "Poly(ether imide)." In Polymer Data Handbook. Oxford University PressNew York, NY, 2009. http://dx.doi.org/10.1093/oso/9780195181012.003.0105.

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Abstract Synthesis Aromatic polyetherimides are usually prepared from: (a) bisphenoxide salts and aromatic dinitrobisimides via nucleophilic nitro-displacement reactions (b) bisphenoxide salt and a bis(N -chlorophthalimido) compound via nucleophilic chloro-displacement reactions in a solvent of low polarity (e.g. o-dichlorobenzene), and in the presence of a thermally stable, phase transfer catalyst stable at the polymerization temperatures, e.g. hexaalkylguanidinium chloride; microwave irradiation accelerated polymerization process; (c) two-step polycondensation of aromatic diamines and ether-dianhydrides in a polar aprotic solvent, followed by thermal6 or chemical cyclodehydration of the polyamic acid precursors, (d) one-step, high temperature solution polymerization of aromatic diamines and ether-dianhydrides in a phenolic solvent, removing water of condensation azeotropically. Certain polyetherimides can also be synthesized via direct melt polymerization.
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