Bibliografías temáticas / Semi-Crystalline structure

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Literatura académica sobre el tema "Semi-Crystalline structure"

Autor: Grafiati
Publicado: 19 de octubre de 2024
Última modificación: 31 de julio de 2025

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Artículos de revistas sobre el tema "Semi-Crystalline structure"

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Hajová, Hana, Richard Pokorný, and Juraj Kosek. "Diffusion Transport in Reconstructed Semi-Crystalline Structure of Polyolefins." Macromolecular Symposia 302, no. 1 (2011): 121–28. http://dx.doi.org/10.1002/masy.201000073.

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Moskalewicz, Tomasz, Sławomir Zimowski, Aleksandra Fiołek, Alicja Łukaszczyk, Beata Dubiel, and Łukasz Cieniek. "The Effect of the Polymer Structure in Composite Alumina/Polyetheretherketone Coatings on Corrosion Resistance, Micro-mechanical and Tribological Properties of the Ti-6Al-4V Alloy." Journal of Materials Engineering and Performance 29, no. 3 (2019): 1426–38. http://dx.doi.org/10.1007/s11665-019-04354-y.

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Abstract This paper describes ways of improving the tribological properties of the Ti-6Al-4V titanium alloy at room and elevated temperatures by electrophoretic deposition of Al2O3/PEEK708 composite coatings and post-heat treatment. The microstructure of the coating components and the coatings was examined by scanning and transmission electron microscopy as well as x-ray diffractometry. The influence of cooling rate after heating of the coated alloy on the PEEK structure and coating surface topography was investigated. It was found that slow cooling with a furnace produced a semi-crystalline s
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Kalwik, Aleksandra, Przemyslaw Postawa, and Marcin Nabialek. "Analysis of Ageing Processes of Semi-Crystalline Materials." Materiale Plastice 57, no. 3 (2020): 41–51. http://dx.doi.org/10.37358/mp.20.3.5378.

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The article presents the influence of accelerated UV ageing on the structural properties of selected polymer materials. In this study, 3 types of materials from a group of thermoplastics known as PP30T, PE, POM were used. The test samples were prepared by injection moulding. In turn, an accelerated UV ageing process (600 h) was carried out in the UV Test chamber with fluorescent lamps characterized by a wavelength of 313 nm. Changes in the structure of the tested materials were observed by using an optical microscope. Measurements of gloss on the surface of primary samples that were exposed to
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Filsinger, D. H., and L. K. Frevel. "Computer Automation of Structure-Sensitive Search-Match Algorithm for Powder Diffraction Analysis." Powder Diffraction 1, no. 1 (1986): 22–25. http://dx.doi.org/10.1017/s0885715600011246.

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AbstractThe Semi-manual Structure-sensitive SEARCH-MATCH procedure [Frevel, (1982), Anal. Chem. 54, 691–697] has been automated for the Hewlett-Packard HP 3354 Computer. The software is coded in the interpretive HP LAB BASIC II language. A core file of 1026 selected powder diffraction standards has been compiled covering the common crystalline phases encountered in industry, the ubiquitous crystalline minerals, and prototypes of the more frequently found crystal structures. Solid solutions can be readily identified.
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Simões, Ricardo, Júlio C. Viana, Gustavo R. Dias, and António M. Cunha. "Mechanical Behavior of the Lamellar Structure in Semi-Crystalline Polymers." Materials Science Forum 730-732 (November 2012): 1006–11. http://dx.doi.org/10.4028/www.scientific.net/msf.730-732.1006.

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We have employed molecular dynamics simulations to study the behavior of virtual polymeric materials under an applied uniaxial tensile load. Through computer simulations, one can obtain experimentally inaccessible information about phenomena taking place at the molecular and microscopic levels. Not only can the global material response be monitored and characterized along time, but the response of macromolecular chains can be followed independently if desired. The computer-generated materials were created by emulating the step-wise polymerization, resulting in self-avoiding chains in 3D with c
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Kim, Man-Ho, Jeong-Mann Doh, Seong Chul Han, et al. "The pore wall structure of porous semi-crystalline anatase TiO2." Journal of Applied Crystallography 44, no. 6 (2011): 1238–45. http://dx.doi.org/10.1107/s0021889811037447.

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The structure of porous TiO2prepared by electrochemical anodization in a fluoride-containing ethylene glycol electrolyte solution was quantitatively studied using small-angle neutron scattering (SANS) and ultra-small-angle neutron scattering (USANS). The cylindrical pores along the coaxial direction were somewhat irregular in shape, were widely distributed in diameter, and seemed to have a broadly pseudo-hexagonal arrangement. The scattering from the pore wall showed a negative deviation from Porod scattering, indicating that the interface between TiO2and the pore was not sharp. A density grad
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Prevorsek, D. C. "Structure of semi crystalline fibers from interpretation of anelastic effects." Journal of Polymer Science Part C: Polymer Symposia 32, no. 1 (2007): 343–75. http://dx.doi.org/10.1002/polc.5070320119.

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Lovelace, J. J., K. Narayan, J. K. Chik, et al. "Imaging modulated reflections from a semi-crystalline state of profilin:actin crystals." Journal of Applied Crystallography 37, no. 2 (2004): 327–30. http://dx.doi.org/10.1107/s0021889804001773.

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Modulated protein crystals remainterra incognitafor most crystallographers. While small-molecule crystallographers have successfully wrestled with and conquered this type of structure determination, to date no modulated macromolecular structures have been reported. Profilin:β-actin in a modulated semi-crystalline state presents a challenge of sufficient biological significance to motivate the development of methods for the accurate collection of data on the complex diffraction pattern and, ultimately, the solution of its structure. In the present work, fine φ-sliced data collection was used to
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Bellinger, Daniel, Jens Pflaum, Christoph Brüning, Volker Engel, and Bernd Engels. "The electronic character of PTCDA thin films in comparison to other perylene-based organic semi-conductors: ab initio-, TD-DFT and semi-empirical computations of the opto-electronic properties of large aggregates." Physical Chemistry Chemical Physics 19, no. 3 (2017): 2434–48. http://dx.doi.org/10.1039/c6cp07673d.

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Avramova, Nadka. "Amorphous and Semi-Crystalline Nylon-6: Processing and Properties." Engineering Plastics 1, no. 4 (1993): 147823919300100. http://dx.doi.org/10.1177/147823919300100403.

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The influence of processing conditions on the structure and properties of nylon-6 are investigated. Amorphous nylon-6 is obtained and its properties are compared with those of semi-crystalline nylon-6. The kinetics of crystallization of nylon-6 depends strongly on the previous thermal prehistory of the melt. The recently observed cumulative character in the structural memory of nylon-6 is successfully applied for obtaining this polymer in a pure amorphous state. It was demonstrated that a critical temperature exists above which the “memory” of this polymer can be erased, and this critical temp
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Tesis sobre el tema "Semi-Crystalline structure"

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Huang, Tao 1962. "Nucleation and growth of spherulitic domain structure in semi-crystalline polymer thin films." Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=34737.

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The grained patterns of semi-crystalline polymer thin films are of great scientific and industrial importance. They strongly affect polymer material properties specially the functionality in optical and electronic applications. The formation of grained pattern is the result of the nucleation-growth process. Nucleation and growth and their evolution have received much interest in the physics, materials and polymer science and engineering community. Typically domain growth associated with first order non-equilibrium phase transitions occurs via spinodal decomposition or nucleation and growth. Ho
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Hussein, Naji. "Enhancement of the mechanical performance of semi-crystalline polyamides by tailoring the intermolecular interaction in the amorphous phase." Thesis, Lyon, INSA, 2013. http://www.theses.fr/2013ISAL0140/document.

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L’utilisation du Polyamide 66 dans l’industrie automobile est en forte croissance car il offre à un bon compromis légèreté/propriétés mécaniques pour les applications de structure. A noter que pendant le service d’un véhicule, les pièces en polyamides sont souvent soumises à des sollicitations mécaniques très sévères aboutissant à une dégradation progressive du matériau. Récemment. E. Mourglia-Seignobos (thèse 2009), a montré que l’endommagement du polyamide 66 implique des mécanismes de cavitation et de microcraquelure dans la phase amorphe. Afin d'améliorer la durabilité de ce matériau, nous
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Simmons, Stephanie. "Influence of processing on the structure and properties of semi-crystalline polymer systems : 1) biodegradable starch/poly(ethylene-vinyl alcohol) blends and 2) polyolefinic thermoplastics." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/11379.

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Housseini, Joulia. "Corrélation entre la dynamique moléculaire, le polymorphisme cristallin et les propriétés électroactives des polymères à base de poly(fluorure de vinylidène) pour des applications pyroélectriques et de récupération d'énergie." Electronic Thesis or Diss., Bordeaux, 2024. http://www.theses.fr/2024BORD0170.

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Les polymères à base de fluorure de vinylidène (VDF) sont des matériaux électroactifs reconnus pour leurs performances fonctionnelles élevées exploitées par les effets piézoélectrique, pyroélectrique et électrocalorique. En plus de ces performances remarquables, leurs propriétés mécaniques, et notamment leur flexibilité, leur permet d’être incorporés dans des dispositifs flexibles conduisant à leur intégration dans une large gamme d'applications telles que les capteurs, le stockage d'énergie, les mémoires imprimées, la réfrigération électrocalorique, et les muscles artificiels. Les propriétés
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Bargain, François. "Structure semi-cristalline et propriétés d'usage de films de copolymères fluorés électro-actifs : influence de la composition et de la mise en forme." Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLET007.

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Le lien entre la structure semi-cristalline et les propriétés d’usage (mécaniques, diélectriques et électro-actives) de films de copolymères fluorés électro-actifs développés pour des applications en électronique organique imprimée a été étudié. Les matériaux investigués sont des copolymères poly(VDF-co-TrFE) et des terpolymères poly(VDF-ter-TrFE-ter-CTFE) à base de fluorure de vinylidène (VDF), trifluoroéthylène (TrFE) et chlorotrifluoroéthylène (CTFE).Les films de polymères obtenus par évaporation du solvant sont étudiés par diffraction des rayons X (SAXS-WAXS), DSC, FTIR, DMA, spectroscopie
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Bargain, François. "Structure semi-cristalline et propriétés d'usage de films de copolymères fluorés électro-actifs : influence de la composition et de la mise en forme." Electronic Thesis or Diss., Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLET007.

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Le lien entre la structure semi-cristalline et les propriétés d’usage (mécaniques, diélectriques et électro-actives) de films de copolymères fluorés électro-actifs développés pour des applications en électronique organique imprimée a été étudié. Les matériaux investigués sont des copolymères poly(VDF-co-TrFE) et des terpolymères poly(VDF-ter-TrFE-ter-CTFE) à base de fluorure de vinylidène (VDF), trifluoroéthylène (TrFE) et chlorotrifluoroéthylène (CTFE).Les films de polymères obtenus par évaporation du solvant sont étudiés par diffraction des rayons X (SAXS-WAXS), DSC, FTIR, DMA, spectroscopie
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Zhou, Hongxia. "Effects of Microcrystallinity on Physical Aging and Environmental Stress Cracking of Poly (ethylene terephthalate) (PET)." See Full Text at OhioLINK ETD Center (Requires Adobe Acrobat Reader for viewing), 2005. http://www.ohiolink.edu/etd/view.cgi?toledo1122315621.

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Dissertation (Ph.D.)--University of Toledo, 2005.<br>Typescript. "A dissertation [submitted] as partial fulfillment of the requirements of the Doctor of Philosophy degree in Engineering." Bibliography: leaves 231-241.
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Odarchenko, Yaroslav. "Tailoring the mesoscopic structure and orientation of semicrystalline and liquid-crystalline polymers : from 1D- to 2D-confinement." Phd thesis, Université de Haute Alsace - Mulhouse, 2012. http://tel.archives-ouvertes.fr/tel-01062091.

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Controlling the micro-structure of organic materials is crucial for a variety of practical applications such as photonics, biomedicine or the rapidly growing field of organic electronics. Recent studies have shown a possibility of tailoring the polymer structure on the nanoscale using supramolecular self-assembly under spatial confinement. Despite extensive studies already performed in this field, many questions remain open. In particular, it will be important to understand how different structure formation processes such as crystallization, LC-phase formation, microphase separation, and other
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Gref, Ruxandra. "Fractionnement par pervaporation de mélanges liquides hydro-organiques partiellement miscibles : mise en évidence du rôle de la structure cristalline des membranes denses sur leurs propriétés de transport." Vandoeuvre-les-Nancy, INPL, 1991. http://docnum.univ-lorraine.fr/public/INPL_T_1991_GREF_R.pdf.

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Nous avons étudié les particularités que manifestent, en pervaporation, les mélanges binaires dont les deux constituants ne sont pas miscibles en toute proportion. Selon la nature des interactions qui s'exercent à l'intérieur du système examiné, nous avons distingué un comportement idéal auquel s'opposent quelques cas particuliers. Nous approfondissons l'étude en choisissant une membrane idéale (acétate de cellulose) et une membrane au comportement particulier (alcool polyvinylique), parmi celles qui se rapprochent le plus des matériaux utilisés à l'échelle industrielle en pervaporation. Nous
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Kumar, Avinesh Avi. "Charge transport in semi-crystalline poly(3-hexylthiophene) (P3HT) structures." Thesis, Queen Mary, University of London, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.538659.

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Libros sobre el tema "Semi-Crystalline structure"

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Brunson, Kevin Michael. Characterization of semi-insulating polycrystalline silicon: The influence of the structural properties of SIPOS films on the electrical properties of their interfaces with crystalline silicon. 1987.

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Capítulos de libros sobre el tema "Semi-Crystalline structure"

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Michler, G. H., and I. Naumann. "INFLUENCE OP MOLECULAR STRUCTURE ON THE MORPHOLOGY OF SEMI-CRYSTALLINE POLYMERS." In Morphology of Polymers, edited by Blahoslav Sedláček. De Gruyter, 1986. http://dx.doi.org/10.1515/9783110858150-026.

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Trotignon, J. P., J. Verdu, and R. Roques. "THE ROLE OF THE SKIN-CORE STRUCTURE IN THE AGEING OF SEMI-CRYSTALLINE POLYMERS." In Morphology of Polymers, edited by Blahoslav Sedláček. De Gruyter, 1986. http://dx.doi.org/10.1515/9783110858150-022.

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Zhang, Le, Bo Yin, Robert Fleischhauer, and Michael Kaliske. "A Temperature-Dependent Viscoelastic Approach to the Constitutive Behavior of Semi-Crystalline Thermoplastics at Finite Deformations." In Creep in Structures VI. Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-39070-8_19.

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Tonelli, A. E., M. A. Gomez, Hajime Tanaka, and M. H. Cozine. "Solid State 13C NMR Studies of the Structures, Conformations, and Dynamics of Semi-Crystalline Polymers." In Solid State NMR of Polymers. Springer US, 1991. http://dx.doi.org/10.1007/978-1-4899-2474-2_4.

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Gouripriya, D. A., Poonam Debnath, and Prosenjit Saha. "Structure, Properties, and Applications of Plant-based and Bacterial Nanocellulose in Tissue Engineering." In Nanocellulose-based Hybrid Systems for Tissue Engineering. Royal Society of Chemistry, 2024. https://doi.org/10.1039/9781837673094-00016.

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This chapter discusses, in detail, the structure, characteristics, and uses of nanocellulose sourced from plants and bacteria within the discipline of tissue engineering. Nanocellulose, a distinct and potentially useful natural substance taken from plant fibres and bacteria, has attracted considerable interest due to its easy availability, renewability, impressive physical properties, unique surface chemistry, and outstanding biological attributes, such as biocompatibility, biodegradability, and non-toxicity. The chapter describes how top-down mechanical and chemical techniques may be used to
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Marius, Arghirescu. "A Preonic Model of Quarks and Particles, Based on a Cold Genesis Theory." In Redefining Standard Model Particle Physics [Working Title]. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.109123.

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The theoretic model explains the generating of heavy quarks and of heavy particles using the known quark s(strange) and two semi-light quarks: λ±(435 MeV) and v±(∼574 MeV) resulting from a cold genesis theory1 of astro-particles’ forming, (CGT), the masses of the quarks c• (charm) and b• (bottom) of the Standard Model but also the values used by de Souza: c = 1.7 GeV and b = 5 GeV, being re-obtained as tri-quark clusters in the form: [(qq¯)q]], by a simple de-excitation reaction, with the emission of a preonic boson obtained in CGT: z0 = 34me, respective: z2 = 4z0 and zμ = 6z0- for the quarks
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Mistry, S., G. Fayaz, K. Wijarnprecha, and D. Rousseau. "Self-assembly of Food-related Lipids." In Soft Matter in Foods. Royal Society of Chemistry, 2025. https://doi.org/10.1039/9781837676699-00048.

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Waxes, fats, and surfactants are three important classes of lipids that undergo self-assembly through interaction of their constituent molecules. The self-assembly of waxes and fats leads to the formation of crystalline or semi-crystalline phases essential for the texture, mouthfeel, stability, and melting behavior of foods such as chocolate, margarine, and spreads. By contrast, surfactants, with their unique amphiphilic nature, can form liquid crystalline phases appropriate for fat reduction or release applications. This chapter explores the similarities and differences in the self-assembly a
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Somashekar, R. "Crystal size and distortion parameters in fibres using Wide-Angle X-ray Scattering (WAXS)." In Defect and Microstructure Analysis by Diffraction. Oxford University PressOxford, 2000. http://dx.doi.org/10.1093/oso/9780198501893.003.0030.

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Abstract Crystal size and paracrystalline disorder of the lattice, which exist in polymer crystals, contribute to the width of the diffraction peaks. Methods have been proposed for obtaining both quantities from the intensity profile (Hosemann and Bagchi, 1962; Guinier, 1963; Vainshtein, 1966). An excellent review of Fourier methods and integral breadth methods is given by Klug and Alexander (1974). The treatments used to estimate crystal size and distortion parameters are based on the Fourier analysis of line profiles (Warren and Averbach, 1952) or on variance analysis (Wilson, 1962b, 1963, 1
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Actas de conferencias sobre el tema "Semi-Crystalline structure"

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Karnati, Manikanth, Adline S. Rebello, Nandana B, Indira Govindaraju, Bharath Prasad AS, and Nirmal Mazumder. "Spectroscopic Investigation of Physico-Chemical Characteristics of Rice Varieties." In JSAP-Optica Joint Symposia. Optica Publishing Group, 2024. https://doi.org/10.1364/jsapo.2024.19a_p08_5.

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Rice (Oryza sativa L.), a versatile grain, is a dietary staple enjoyed worldwide, cherished for its culinary adaptability and nutritional richness. Its widespread consumption underscores its integral role in diverse cuisines and as a vital source of sustenance for countless cultures. As a significant source of carbohydrates, rice production has been rising, reaching 510.6 million tonnes in 2017 (FAO, 2018) Starch, a prevalent carbohydrate in rice, comprises two primary constituents: amylose and 85 amylopectin. Long linear chains with limited branching characterize amylose, whereas amylopectin
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Zhao, Y. "The structure of electrical trees in semi-crystalline polymers." In Eighth International Conference on Dielectric Materials, Measurements and Applications. IEE, 2000. http://dx.doi.org/10.1049/cp:20000525.

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Zhang, G., H. Liao, C. Coddet, et al. "Influence of Annealing Condition on Crystallization Behavior and Mechanical Properties of Thermal Sprayed PEEK Coating." In ITSC2005, edited by E. Lugscheider. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2005. http://dx.doi.org/10.31399/asm.cp.itsc2005p0732.

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Abstract Amorphous PEEK coating was prepared on Al substrate, employing flame spraying technology. The amorphous coating was subjected to annealing treatments under different conditions. Both differential scanning calorimetry (DSC) and wide angle X-ray diffraction (WAXD) analysis revealed that the isothermally treated coating exhibited semi-crystalline structure. Coexistence of double crystal entities in semi-crystalline PEEK coating was deduced from the results obtained by DSC and WAXD measurements. Annealing temperature and holding time under this temperature affect the morphology of the min
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Li, Shuangshan, Mathew Wynn, and Navid Zobeiry. "A Machine Learning Framework for In-Situ Microstructural and Kinetics Analysis of Thermoplastic Composites While Processing Under a Polarized Microscope." In ASME 2023 Aerospace Structures, Structural Dynamics, and Materials Conference. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/ssdm2023-105758.

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Abstract There has been a significant increase in thermoplastic composite applications in aerospace in recent years. Semi-crystalline thermoplastics like polyetheretherketone (PEEK) nucleate and grow crystalline structures called spherulites. Addition of carbon fibers forms a crystal structure called transcrystallinity. Processing parameters such as thermal uniformity, dwell time, and temperature history influence crystallinity and crystal morphology in thermoplastic composites. To investigate crystal morphology, neat PEEK and PEEK-carbon fiber composite samples are melted and cooled down whil
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Zhang, G., H. Liao, M. Cherigui, and C. Coddet. "Effect of Substrate Surface Topography and Temperature on Millimeter and Micrometer Sized Splat Formation and on Thermal Contact Resistance." In ITSC2006, edited by B. R. Marple, M. M. Hyland, Y. C. Lau, R. S. Lima, and J. Voyer. ASM International, 2006. http://dx.doi.org/10.31399/asm.cp.itsc2006p0923.

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Abstract Flame sprayed PEEK (poly-ether-ether-ketone) coatings, with an amorphous structure, were subjected to isothermal treatments with annealing temperatures from 180 to 300 °C and holding time from 1 to 30 min. The coating structures were studied by means of DSC (Differential Scanning Calorimetry) and XRD (X-Ray Diffraction) analyses. All annealed coatings exhibit semi-crystalline structures. Coexistence of thick and thin lamellae in the spherulites of annealed coatings can be deduced from the analysis results. The Knoop hardness and the interfacial adhesion of the coatings were examined.
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Özten, Almila, Fatih Sargın, Kürşat Kanbur, Alperen Kızılöz, and Ahmet Türk. "Investigation of Triton X-100 Use in PVA Nanofiber Production." In 6th International Students Science Congress. Izmir International Guest Student Association, 2022. http://dx.doi.org/10.52460/issc.2022.044.

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Polyvinylalcohol (PVA) is a hydrophilic, non-toxic, and biocompatible semi-crystalline biomaterial. Today, PVA nanofibers are widely used in the field of biomaterials, as they provide high surface area and a favorable environment for the growth of cells. PVA nanofibers are used in the construction or repair of scaffold types for tissue engineering applications, thanks to positive effect of their three-dimensional structure on cell proliferation and growth. In addition, the use of PVA nanofiber structures in many areas such as drug release, wound dressing, filters and soft tissue applications i
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Li, Chang-Jiu, Guan-Jun Yang, and Cheng-Xin Li. "Development of the Particle Interface Bonding in Thermal Spray Coatings for Expanding High Performance Applications." In ITSC 2012, edited by R. S. Lima, A. Agarwal, M. M. Hyland, et al. ASM International, 2012. http://dx.doi.org/10.31399/asm.cp.itsc2012p0047.

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Abstract Thermally sprayed coatings are formed through the successive impact of molten droplets and/or semi-molten particles followed by flattening, rapid cooling, and solidification. Individual droplets flatten to form splats of several micrometers in thickness upon impact and result in the formation of a coating that has a lamellar structure with limited interface bonding. The inclusion of semi-molten particles in the coating modifies its microstructure. The bonding between particles dominates coating properties and performance. This review paper examines the bonding formation at the interfa
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Kalia, Karun, and Amir Ameli. "Interfacial Bond Strength of Various Rigid/Soft Multi-Materials Printed via Fused Filament Fabrication Process." In ASME 2020 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/smasis2020-2298.

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Abstract Layered multi-materials of dissimilar polymers and their nanocomposites offer new opportunities as smart materials and structures. A critical aspect of such structures is the quality of interlayer adhesion between dissimilar polymer matrices. This work reports the development of asymmetric double cantilever beam (ADCB) specimens of dissimilar polymers and its use in the analysis and understanding of their interlayer adhesion in 3D-printed rigid/soft interfaces. Acrylonitrile butadiene styrene (ABS), polycarbonate (PC), polylactic acid (PLA) were chosen as the rigid polymers and combin
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WYNN, MATHEW, KUAN-TING CHEN, and NAVID ZOBEIRY. "CHARACTERIZING THERMAL DEGRADATION IN SEMI-CRYSTALLINE THERMOPLASTIC COMPOSITES." In Proceedings for the American Society for Composites-Thirty Eighth Technical Conference. Destech Publications, Inc., 2023. http://dx.doi.org/10.12783/asc38/36599.

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Semi-crystalline thermoplastic composites, such as carbon fiber-reinforced polyetheretherketone (PEEK) and polyetherketoneketone (PEKK), are processed and consolidated while melted at high temperatures. During cool-down, polymer chains fold into lamellar structures at the nanoscale to form crystalline morphology. These lamellar structures radiate from a nucleus, creating spherulitic structures in bulk polymers, and transcrystallinity in fiber reinforced polymers. A certain amount of thermal degradation occurs when the thermoplastic matrix is melted, and the amount of degradation is a factor of
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10

Fayyad, Eman, Aboubakr Abdullah, Mohamed Hassan, et al. "Novel Electroless Deposited Corrosion – Resistant and Anti-Bacterial NiP–TiNi Nanocomposite Coatings." In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0009.

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From acidic NiP electroless bath, the co-deposition of TiNi nanoparticles in the NiP matrix to form novel NiP-TiNi nanocomposite coatings (NCCs) on top of API X100 carbon steel using several concentrations of TiNi nanoparticles (0.2, 0.4 and 0.8 g L-1 in the bath) is successfully achieved. The influence of the TiNi nanoparticles on the composition, deposition rate, thickness, and morphology of the NiP coating are investigated before and after annealing at 400 oC. The addition of TiNi nanoparticles into the NiP matrix led to the transform of the amorphous structure of the as-plated NiP into a s
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Informes sobre el tema "Semi-Crystalline structure"

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Pisani, William, Dane Wedgeworth, Michael Roth, John Newman, and Manoj Shukla. Exploration of two polymer nanocomposite structure-property relationships facilitated by molecular dynamics simulation and multiscale modeling. Engineer Research and Development Center (U.S.), 2023. http://dx.doi.org/10.21079/11681/46713.

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Polyamide 6 (PA6) is a semi-crystalline thermoplastic used in many engineering applications due to good strength, stiffness, mechanical damping, wear/abrasion resistance, and excellent performance-to-cost ratio. In this report, two structure-property relationships were explored. First, carbon nanotubes (CNT) and graphene (G) were used as reinforcement molecules in simulated and experimentally prepared PA6 matrices to improve the overall mechanical properties. Molecular dynamics (MD) simulations with INTERFACE and reactive INTERFACE force fields (IFF and IFF-R) were used to predict bulk and You
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2

Speranza, Vito, and Roberto Pantani. Investigation of isotactic polypropylene crystallization in processing conditions. Universidad de los Andes, 2024. https://doi.org/10.51573/andes.pps39.gs.msd.1.

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Flow and pressure applied during polymer transformation processes of semi-crystalline polymers can significantly affect the kinetics of crystallization, final morphology, and properties of the part. In commonly used polymer transformation processes, the molten polymer is subjected to high pressure and thermal stress, as well as intense shear and elongational flow fields. The effect of pressure on crystallization kinetics is significant from both scientific and technological perspectives since the polymer solidifies under high pressure in important industrial processing techniques. On the other
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3

Petrausch, Julius, Daniel Klein, Johannes Zimmer, and Markus Stommel. On the cryo-molding process and subsequent forming processes of biopolymers with low glass transition temperature. Universidad de los Andes, 2024. https://doi.org/10.51573/andes.pps39.ss.bbb.10.

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Bio-based as well as biodegradable polymers are increasingly finding their way into applications such as food packaging. Here, certain biopolymers with a high degree of crystallinity may be of interest due to their superior barrier properties. Conversely, forming processes including high deformations often require an almost amorphous material state to avoid the brittle behavior associated with crystal structures. For some of those biopolymers, the narrow window in which they can be processed has delayed their potential use for packaging applications. In rigid packaging, two-step processes are
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