Gotowe bibliografie tematyczne / Copolymars composites

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Gotowa bibliografia na temat „Copolymars composites”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Copolymars composites"

Nandekar, Kamlakar. "Novel Applications of Some Organic Copolymers Derived From Phenolic and Nitrogen-Containing Compounds- A Review". Journal of ISAS 2, nr 1 (31.07.2023): 15–26. http://dx.doi.org/10.59143/isas.jisas.2.1.kdqi5413.

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A variety of organic copolymers have been synthesized from phenolic compounds like p-Hydroxybenzoic acid, p-Hydroxybenzaldehyde, p-Hydroxyacetophenone, and also from nitrogen- containing compound like anthranilic acid, aniline, urea, biurate. These copolymers have been studied for various properties like thermal behavior, kinetic parameters, antimicrobial screening, ion-exchange study, polymer composites, photoluminiscence etc. Kinetic parameters of the copolymers derived from phenolic and nitrogen-containing compounds have been studied using Freeman-Carroll (FC) and Sharp-Wentworth (SW). Based on TGA, thermal stability and decomposition temperature have been studied for the copolymers and composites. Higher thermal stability for copolymer composites has been found as compared to the copolymer because the composite has a high activation energy and more residue left out at the end of the decomposition process. The metal ion uptake capacity of the copolymer have been studied by using the batch equilibrium method and is useful for wastewater treatment. The antimicrobial activity of the copolymers have been studied using the agar diffusion method. Polymer composites have been made from copolymers using an ultra-sonication process and exhibit excellent properties in metal ion uptake for wastewater treatment. The present review paper involves the study of novel applications of the copolymer resins derived from phenolic compound and nitrogen-containing compound.

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Chon, Yang, Lee, Kim, Jeon, Jho i Chung. "Novel PEEK Copolymer Synthesis and Biosafety – I: Cytotoxicity Evaluation for Clinical Application". Polymers 11, nr 11 (2.11.2019): 1803. http://dx.doi.org/10.3390/polym11111803.

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In this research, we synthesized novel polyetheretherketone (PEEK) copolymers and evaluated the biosafety and cytotoxicity of their composites for spinal cage applications in the orthopedic field. The PEEK copolymers and their composites were prepared through a solution polymerization method using diphenyl sulfone as a polymerization solvent. The composite of PEEK copolymer showed good mechanical properties similar to that of natural bone, and also showed good thermal characteristics for the processing of clinical use as spine cage. The results of an in vitro cytotoxicity test did not show any evidence of a toxic effect on the novel PEEK composite. On the basis of these cytotoxicity test results, the PEEK composite also proved its in vitro biosafety for application to an implantable spine cage.

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BARIM, Esra. "Synthesis, Characterization, Optical and Thermal Properties of P(NVC-co-BZMA) Copolymer and Its ZnO Composites". Gazi University Journal of Science Part A: Engineering and Innovation 9, nr 4 (31.12.2022): 526–36. http://dx.doi.org/10.54287/gujsa.1199767.

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Recent studies have paid particular attention to polymer-nanoparticle composite materials considering they have a number of interesting properties, which include optical, thermal, electrical, and others (Reyna-Gonzalez et al., 2009; Yakuphanoglu et al., 2010). In this study, a free radical polymerization process was used to create a copolymer of N-vinylcarbazole (NVC) and benzyl methacrylate (BZMA) at 25–75 mol% each. The procedure was conducted at 70°C with azobisisobutyronitrile (AIBN) acting as the initiator. Nano zinc oxide powders were then added to composites at three different ratios of 5%, 10%, and 15% weight of the copolymer. In order to better understand the structures of the P(NVC-co-BZMA) and its composites, FT-IR, 1H NMR, and UV spectroscopic techniques were also implemented. The optical characteristics of both the pure copolymer and its composites were examined. In the visible region, the composite containing 15% nano ZnO had the highest optical absorbance value. Additionally, the thermal behaviours of the composites and copolymers were analysed.

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Tzoumani, Ioanna, Zacharoula Iatridi, Athena M. Fidelli, Poppy Krassa, Joannis K. Kallitsis i Georgios Bokias. "Room-Temperature Self-Healable Blends of Waterborne Polyurethanes with 2-Hydroxyethyl Methacrylate-Based Polymers". International Journal of Molecular Sciences 24, nr 3 (29.01.2023): 2575. http://dx.doi.org/10.3390/ijms24032575.

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The design of self-healing agents is a topic of important scientific interest for the development of high-performance materials for coating applications. Herein, two series of copolymers of 2-hydroxyethyl methacrylate (HEMA) with either the hydrophilic N,N-dimethylacrylamide (DMAM) or the epoxy group-bearing hydrophobic glycidyl methacrylate were synthesized and studied as potential self-healing agents of waterborne polyurethanes (WPU). The molar percentage of DMAM or GMA units in the P(HEMA-co-DMAMy) and P(HEMA-co-GMAy) copolymers varies from 0% up to 80%. WPU/polymer composites with a 10% w/w or 20% w/w copolymer content were prepared with the facile method of solution mixing. Thanks to the presence of P(HEMA-co-DMAMy) copolymers, WPU/P(HEMA-co-DMAMy) composite films exhibited surface hydrophilicity (water contact angle studies), and tendency for water uptake (water sorption kinetics studies). In contrast, the surfaces of the WPU/P(HEMA-co-GMAy) composites were less hydrophilic compared with the WPU/P(HEMA-co-DMAMy) ones. The room-temperature, water-mediated self-healing ability of these composites was investigated through addition of water drops on the damaged area. Both copolymer series exhibited healing abilities, with the hydrophilic P(HEMA-co-DMAMy) copolymers being more promising. This green healing procedure, in combination with the simple film fabrication process and simple healing triggering, makes these materials attractive for practical applications.

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Prasomsin, Wassika, Tewarak Parnklang, Chaweewan Sapcharoenkun, Sunan Tiptipakorn i Sarawut Rimdusit. "Multiwalled Carbon Nanotube Reinforced Bio-Based Benzoxazine/Epoxy Composites with NIR-Laser Stimulated Shape Memory Effects". Nanomaterials 9, nr 6 (14.06.2019): 881. http://dx.doi.org/10.3390/nano9060881.

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Smart materials with light-actuated shape memory effects are developed from renewable resources in this work. Bio-based benzoxazine resin is prepared from vanillin, furfurylamine, and paraformaldehyde by utilizing the Mannich-like condensation. Vanillin-furfurylamine-containing benzoxazine resin (V-fa) is subsequently copolymerized with epoxidized castor oil (ECO). When the copolymer is reinforced with multiwalled carbon nanotubes (MWCNTs), the resulting composite exhibits shape memory effects. Molecular characteristics of V-fa resin, ECO, and V-fa/ECO copolymers are obtained from Fourier transform infrared (FT-IR) spectroscopy. Curing behavior of V-fa/ECO copolymers is investigated by differential scanning calorimetry. Dynamic mechanical properties of MWCNT reinforced V-fa/ECO composites are determined by dynamic mechanical analysis. Morphological details and distribution of MWCNTs within the copolymer matrix are characterized by transmission electron microscopy. Shape memory performances of MWCNT reinforced V-fa/ECO composites are studied by shape memory tests performed with a universal testing machine. After a significant deformation to a temporary shape, the composites can be recovered to the original shape by near-infrared (NIR) laser actuation. The shape recovery process can be stimulated at a specific site of the composite simply by focusing NIR laser to that site. The shape recovery time of the composites under NIR actuation is four times faster than the shape recovery process under conventional thermal activation. Furthermore, the composites possess good shape fixity and good shape recovery under NIR actuation.

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Tzoumani, Ioanna, Amaia Soto Beobide, Zacharoula Iatridi, George A. Voyiatzis, Georgios Bokias i Joannis K. Kallitsis. "Glycidyl Methacrylate-Based Copolymers as Healing Agents of Waterborne Polyurethanes". International Journal of Molecular Sciences 23, nr 15 (23.07.2022): 8118. http://dx.doi.org/10.3390/ijms23158118.

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Self-healing materials and self-healing mechanisms are two topics that have attracted huge scientific interest in recent decades. Macromolecular chemistry can provide appropriately tailored functional polymers with desired healing properties. Herein, we report the incorporation of glycidyl methacrylate-based (GMA) copolymers in waterborne polyurethanes (WPUs) and the study of their potential healing ability. Two types of copolymers were synthesized, namely the hydrophobic P(BA-co-GMAy) copolymers of GMA with n-butyl acrylate (BA) and the amphiphilic copolymers P(PEGMA-co-GMAy) of GMA with a poly(ethylene glycol) methyl ether methacrylate (PEGMA) macromonomer. We demonstrate that the blending of these types of copolymers with two WPUs leads to homogenous composites. While the addition of P(BA-co-GMAy) in the WPUs leads to amorphous materials, the addition of P(PEGMA-co-GMAy) copolymers leads to hybrid composite systems varying from amorphous to semi-crystalline, depending on copolymer or blend composition. The healing efficiency of these copolymers was explored upon application of two external triggers (addition of water or heating). Promising healing results were exhibited by the final composites when water was used as a healing trigger.

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O'Donnell, Justin N. R., i Drago Skrtic. "Degree of Vinyl Conversion, Polymerization Shrinkage and Stress Development in Experimental Endodontic Composite". Journal of Biomimetics, Biomaterials and Tissue Engineering 4 (grudzień 2009): 1–12. http://dx.doi.org/10.4028/www.scientific.net/jbbte.4.1.

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This study explores degree of vinyl conversion (DVC), polymerization shrinkage (PS) and shrinkage stress (PSS) of the experimental amorphous calcium phosphate (ACP) composites intended for use as an endodontic sealer. Light-cure (LC), chemical cure (CC) or dual-cure (DC; combined light and chemical cure) resins comprised urethane dimethacrylate (UDMA), 2-hydroxyethyl methacrylate (HEMA), methacryloyloxyethyl phthalate (MEP) and a high molecular mass oligomeric co-monomer, poly(ethyleneglycol)-extended UDMA (PEG-U) (designated UPHM resin). To fabricate composites, a mass fraction of 60 % UPHM resin was blended with a mass fraction of 40 % as-made (am-ACP) or ground ACP (g-ACP). DVC values of copolymer (unfilled UPHM resin) and composite specimens were determined by infrared spectroscopy. Glass-filled composites were used as controls. PS and PSS of composites were determined by dilatometry and tensometry, respectively. LC copolymers attained extraordinary high DVC values at 24 h post-cure (95.7 %), compared to CC (52 %) and DC (79.3 %) copolymer specimens. While the DVC values of LC and DC am-ACP composites were reduced between 5 and 10 %, DVC values of DC g-ACP composites increased almost 8 % compared to the corresponding copolymers. High DVC attained in LC composites was, expectedly, accompanied with high PS values (on average 7 vol%). However, PSS developed in LC and especially DC composites did not exceed PSS values seen in other UDMA-based composites. Based on this initial evaluation, it is concluded that, DC, g-ACP filled UPHM composite shows promise as an endodontic sealer. However, further physicochemical evaluations, including water sorption, mechanical stability and ion release as well as a leachability studies need to be performed before this experimental material is tested for cellular responses and, eventually recommended for clinical utility.

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Desbrieres, Jacques, Stephanie Reynaud, Pierre Marcasuzaa i Francis Ehrenfeld. "Actuator-Like Hydrogels Based on Conductive Chitosan". Advances in Science and Technology 84 (wrzesień 2012): 29–38. http://dx.doi.org/10.4028/www.scientific.net/ast.84.29.

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Intrinsically conducting polymers are of great interest for a large number of applications. But among major drawbacks are their low solubility in common solvents and their poor mechanical properties. Elaboration of composites associating a matrix, bringing its mechanical properties, and polyaniline, as the conducting polymer is a way of overcoming these disadvantages. Chitosan-graft-polyaniline copolymers were synthesized by simple oxidative method. The grafting reaction was quite total and it was found that the copolymers crosslinked to yield a composite hydrogel in which the polyaniline was homogeneously embedded. The conductivity of precursor (block copolymer) and gels was found to be larger than 10-2 S.cm-1. The composite gels were characterized in terms of swelling and rheological properties. They can be classified as "superabsorbent" hydrogels and the swelling is reversible. The composite gels were then successfully used as actuators.

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Liu, Fei, Shan Lu, Weihong Cao, Juncheng Huang, Yi Sun, Yiting Xu, Meiling Chen, Haining Na i Jin Zhu. "Using Cellulose-graft-Poly(L-lactide) Copolymers as Effective Compatibilizers for the Preparation of Cellulose/Poly(L-lactide) Composites with Enhanced Interfacial Compatibility". Polymers 14, nr 17 (24.08.2022): 3449. http://dx.doi.org/10.3390/polym14173449.

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Cellulose-grafte-poly(L-lactide) (C-g-PLLA) copolymers synthesized in a CO2-switchable solvent are proposed for use as effective compatibilizers for the preparation of cellulose–PLLA composites with enhanced interfacial compatibility. The effect of the molar substitution (MSPLLA) of the grafted PLLA side chain in the C-g-PLLA copolymer and the feeding amount of this copolymer on the mechanical and thermal properties and hydrophilicity of the composites was investigated. The composites had a largely increased impact strength with the incorporation of the compatibilizer. With the increasing of MSPLLA and the feeding amount of the copolymer, the resulting composites had an increased impact strength. When 5 wt% C-g-PLLA with MSPLLA of 4.46 was used as a compatibilizer, the obtained composite containing 20 wt% cellulose presented an impact strength equal to that obtained for the neat PLLA. The composites had a slightly decreased melting temperature and thermal decomposition temperature, but increased hydrophilicity due to the incorporation of the compatibilizer. This work suggests an effective method to improve the interfacial compatibility between cellulose and PLLA for the fabrication of fully bio-based composites with high performance.

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Piggott, M. R., i W. (Vincent) Zhou. "Shrinkage Control in Fibre Reinforced Polymers III: Carbon Fibre Reinforced Polyesters with Expanding Monomers and Low Profile Additives". Engineering Plastics 3, nr 6 (styczeń 1995): 147823919500300. http://dx.doi.org/10.1177/147823919500300601.

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Copolymers of polyester were made with two spiro orthocarbonates: cyclohexane and cyclohexene. They were also used to make unidirectional carbon fibre composites, and the properties of polymers and composites were compared with those made with a low profile additive (a copolymer of methyl and allyl methacrylates). The copolymers were not effective in reducing the shrinkage stress of the resin, except through a reduction in glass transition temperature. They gave composites with poor properties. The low profile additive was effective in reducing the shrinkage volume, but at the cost of a reduction in tensile strength. It did not affect the shrinkage stress very much, and did not have much effect on composite properties. Thus, while it is advantageous to use low profile additives with reinforced polyesters, it is not beneficial to use spiro orthocarbonate expanding monomers. Overall, the three papers in this series strongly suggest that, while controlling shrinkage stress may well be useful, it cannot be realized to any useful extent by using expanding monomers.

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Rozprawy doktorskie na temat "Copolymars composites"

Granat, Cécile. "Étude des mécanismes d’auto-adhésion entre élastomère et matériau composite : Impact des paramètres de formulation et de mise en oeuvre des élastomères et du composite sur les caractéristiques de l’assemblage". Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0054.

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Dans de nombreux domaines, tels que l’aéronautique et l’aérospatial, les matériaux composites sont utilisés par soucis d’allègement des structures. Pour cette même raison, les assemblages mettant en jeu ces matériaux sont préférentiellement réalisés par collage. Ce mode d’assemblage présente aussi l’avantage d’éviter tout risque d’endommagement engendré par des ruptures de fibres. Néanmoins, chacune des opérations de mise en œuvre du collage doit être maîtrisée, en particulier lorsque des élastomères réticulés, réputés peu aptes au collage, sont impliqués. Ainsi, un primaire est généralement utilisé pour assurer l’adhésion entre l’élastomère et le matériau composite. Dans ce travail de thèse, il s’agit de supprimer l'étape d’enduction du primaire à la surface de l’élastomère réticulé avant bobinage des fibres imprégnées de résine. Cette suppression vise à réduire les risques Hygiène Sécurité Environnement (primaire classé Cancérigène, Mutagène et Reprotoxique) et permet de simplifier les cycles de fabrication. Pour assurer l’adhésion entre l’élastomère réticulé à base d’EPDM et le matériau composite à matrice époxyde sans élément intermédiaire, il est essentiel de comprendre les mécanismes de formation de l’assemblage : création de liaisons physiques, influence de la rugosité de surface, diffusion de monomères et réactions chimiques. Cette compréhension permet par la suite de modifier la formulation des matériaux, dans notre cas remplacer le copolymère présent dans l’élastomère, afin d’améliorer l’adhésion et de s’affranchir de tout traitement de surface
In many fields, in particular in aeronautic and aerospace, assemblies by bonding instead of bolting are used in order to lighten structures involving composite materials. Furthermore chemical bonding minimizes the risk of damage by fibers breaking. In this context, our research work concerns the assembly between a cured elastomer, known to be difficult to be bonded, and a composite material without using adhesives which are classified as carcinogenic, mutagenic and toxic agent. In order to have a good adhesion between cured EPDM elastomer and composite material with epoxy resin without adhesive, it is crucial to understand mechanisms of self assembly of these materials: role of physical bonds, influence of roughness, monomers diffusion and chemical reactions. This good understanding allows us editing material formulations, in our case copolymer in elastomer, to improve adhesion and remove surface treatment

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Hamdoun, Bassam. "Composites copolymères/nanoparticules". Le Mans, 1995. http://www.theses.fr/1995LEMA1004.

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Le travail presente dans cette these a permis l'elaboration de nouveaux materiaux composites formes de copolymeres diblocs (a-b) et de nanoparticules maghemite. Les conditions permettant la solubilisation des particules dans des phases ordonnees de copolymeres de deux types (lamellaires et cubiques) ont ete determinees. Elles impliquent en particulier le greffage chimique de courtes chaines de polymeres a la surface des particules ; le polymere greffe etant chimiquement identique a l'un des blocs du copolymere (a par exemple). L'influence des differents parametres gouvernant la structure du composite a ete examinee. Ses parametres sont: la taille des nanoparticules, la nature de leur enrobage, le temps de recuit des materiaux, la dissymetrie du copolymere et sa masse. Les materiaux obtenus se presentent sous forme de films minces. Les techniques utilisees pour les caracteriser sont la microscopie optique, la microscopie electronique a transmission apres microtomie, et la microscopie a force atomique (afm). La these comprend aussi une etude theorique de l'influence des nanoparticules sur les caracteristiques structurelles et mecaniques du copolymere dans le cas d'un ordre lamellaire. Les changements induits sur la periode lamellaire et les constantes elastiques de compression et de courbure ont ete predits. Des experiences d'afm ont permis de verifier les predictions concernant la periode lamellaire. Par ailleurs, la courbure spontanee des interfaces a/b induite par la presence des nanoparticules a ete calculee. Ce travail prepare l'etude du diagramme de phase de ces nouveaux composites. Il est finalement important de souligner que les materiaux obtenus sont des edifices auto-organises, donc thermodynamiquement tres stables

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Ma, Hongming. "Structure-property relationships in copolyester fibers and composite fibers". Diss., Available online, Georgia Institute of Technology, 2004:, 2004. http://etd.gatech.edu/theses/available/etd-04112004-150623/unrestricted/Ma%5FHongming%5F200405%5Fphd.pdf.

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Thesis (Ph. D.)--Chemistry and Biochemistry, Georgia Institute of Technology, 2004.
Collard, David, Committee Co-Chair ; Schiraldi, David, Committee Member ; Liotta, Charles, Committee Member ; Weck, Marcus, Committee Member ; Srinivasarao, Mohan, Committee Member ; Kumar, Satish, Committee Co-Chair. Vita. Includes bibliographical references.

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Basson, Nicolaas Christiaan. "The effect of molecular composition on the properties of polyolefin-wood composites". Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/80222.

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Thesis (PhD)--Stellenbosch University, 2013.
ENGLISH ABSTRACT: Polymer composites, and in particular wood-polymer composites have become commercially and environmentally important materials. Studies in polyolefin-wood composites have mostly focused on polypropylene (PP) and polyethylene (PE). To our knowledge, no study has been undertaken on advancing impact polypropylene copolymer (IPPC)-wood composites as a suitable alternative to using PP and PE. IPPC have proven to be a suitable alternative to PP at low temperatures to improve impact resistance for manufactured polymer products, and could be a great addition to improved properties for wood polymer composites. This study shows that the physical properties of IPPC-wood composites can be markedly improved when compatibilizer(s) are used to improve the distribution of the wood within the matrix, as well as improving the interaction between the wood and the polymer matrix.. The use of different compatibilizers, vi polypropylene-graft-maleic anhydride (PPgMA) and poly(ethylene-co-vinyl alcohol) (EvOH) results in different physical properties. Using simple admixtures of the PPgMA and EvOH in IPPC-wood composites result in a large spread of results, while pre-reacting the PPgMA and EvOH to form a joint compatibilizer gives reproducible results w.r.t the physical testing. A study of the fundamental interactions of the compatibilizer(s) with the molecular components of the IPPCs was undertaken. The IPPCs used were fractionated by preparative temperature rising elution fractionation, and the fractions were mixed with the compatibilizers. To this end, fluorescence microscopy was utilized to study the interaction. The results clearly indicate that the interaction of the PPgMA with the fractions differ from that of the EvOH. These differences can be explained in terms of the chemical composition distribution within the IPPC fractions. Atomic force microscopy (AFM) was used to study adhesive forces between compatibilizer, polymer and cellulose and lignin. Successful coating of AFM tips with PPgMA and EvOH was achieved. Whilst interactions based on chemical force microscopy (CFM) could not be quantified, the AFM results in conjunction with fluorescence spectroscopy provided meaningful insight in the way that compatibilizers interact with both the wood and the impact copolymers used in this study.
AFRIKAANSE OPSOMMING: Polimeer saamgestelde material, en meer spesifiek hout-polimeer saamgestelde material het die afgelope tyd belangrike produkte geword, beide kommersieel en in verband met omgewingvriendelikheid. Navorsing op die gebied van poli(olefien)-hout komposiete het tot op hede meestal gefokus op die grbruik van poli(propileen) (PP) en poli(etileen) (PE). Sover dit on kennis strek is daar nog geen studie gedoen om die gebied van impak polipropileen kopolimere (IPPK)-hout komposiete uit te bou nie. IPPKs is ‘n geskikte alternatief vir PP in veral laetemperatuur aanwendings. Die gebruik van IPPKs as matriks vir die hout komposiete kan ‘n groot staqp vorentoe beteken. Hierdie studie wys dat die fisiese eienskappe van iPPK-hout komposiete merkwaardig verbeter kan word waneer versoeningmateriale gebruik word om die verspreiding van die hout in die polimeermatriks sowel as die interaksie tussen die hout en polimeer te verbeter. Die gebruik van verskillende versoenings material, t.w poli(propileen-ent-maleinsuur anhidried) (PPeMA) en pol(etlieen-ko-viniel alkohol) (EVOH). Deur gebruik te maak van eenvoudige mengsels van PPeMA en EVOH in IPPK-hout composite het ‘n geweldige wye verpreiding van resultate tot gevolg gehad, terwyl ‘n voorafgaande reaksie tussen die PPeMA en die EVOH om ‘n saamgestelde versoeningmateriaal te maak tot gevolg gehad het dat reproduseerbare resultate verkry kon word. ‘n Studie van die fundamentele interaksies van die versoeningsmateriale met die molkulêre komponente van die IPPKs is uitgevoer. Die IPPKs is gefraksioneer deur preparatiewe temperatuur-stygende uitloog frakasionering en die fraksies is gemeng met die versoeningmateriale. Fluoressensie mikroskopie is gebruik om hierdie interaksies te bestudeer. Die resultate dui duidelik daarop dat die interaksie van die PPeMA met die fraksies verskil met die van die EVOH. Die verskille kan verduidelik word aan die hand van die chemiese samestelling verspreiding van die IPPK fraksies. Atoomkrag mikroskopie (AKM) is gebruik om die adhesive-kragte tussen die versoeningmateriale, polimere, sellulose en lignien. AKM tippe is suksesvol bedek met PPeMA en EVOH, onderskeidelik. Alhoewel interaksies gebaseer op chemiese krag mikroskopie (CKM) nie gekwantifiseer kon word nie, lewer hierdie resultate tesame met die fluoressensie spektroskopie unieke insig in die manier wat versoeningmateriale met beide die hout en die polimeer reageer.

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McElroy, C. R. "Composite materials from copolymers incorporating renewable resources". Thesis, Keele University, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.491843.

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A robust method for the production of an emulsion polymer based on styrene-acrylic acid-acrylic ester was developed to give enhanced physical properties and/or reduced envhonmental impact. Replacing the methyl methacrylate content with n-butyl acrylate, tert-butyl acrylate and ethyl acrylate all gave stable polymer emulsions. Replacing methyl methacrylate with fatty acid based monomer containing no more than one polymerisable acrylate group per molecule also led to the production of a stable emulsion, with the fatty acid based monomer also acting as a self-emulsifying agent if having sufficient amphiphilic character. All stable emulsions were successfully used to produce composite materials.

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Johns, Katharine. "Studies on composite copolymer particles". Thesis, University of Bristol, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284316.

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Marcilloux, Jérôme. "Contribution à l'étude de charges organiques pour matériaux composites à matrice élastomère : modification de surface de particules de polystyrène réticulées et encapsulation d'hydrocarbures polycycliques". Mulhouse, 1995. http://www.theses.fr/1995MULH0365.

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Le but de ce travail était d'améliorer les propriétés mécaniques et le comportement en combustion de propergols solides. L'encapsulation d'hydrocarbure de densité élevée a été étudiée afin d'obtenir des charges de haute densité énergétique. Le cahier des charges était très rigoureux, notamment en ce qui concerne les taux d'azote et d'oxygène ; mais nous avons pu obtenir des microbilles correspondant à toutes les spécifications, exception faite de l'exsudation à 60°C qui reste trop élevée. Les paramètres importants ont été isolés et un mécanisme réactionnel proposé. L'amélioration des propriétés mécaniques de la matrice a été étudiée du point de vue de la modification de surface de particules styréniques et ce, selon deux procédés. Le but était la génération en surface de fonctions hydroxyles ou carboxyles susceptibles d'interagir avec les diisocyanates réticulant la matrice élastomère. Selon le premier procédé, le dimère d'acrylate de tertiobutyle a été greffé par voie radicalaire puis les chaînes ainsi obtenues ont été hydrolysées ou transestérifiées avec de l'éthylène glycol. Le second procédé était fondé sur l'adsorption de copolymère bloc polystyrène-polyoxyde d'éthylène dont la première séquence devait assurer la compatibilité avec le coeur alors que la seconde avait pour but d'apporter les fonctions hydroxyles souhaitées. Apres comparaison des deux procédés avant et après traitement, les deux se sont avérés efficaces

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Kalloudis, Michail. "Thin polymer films of block copolymers and blend/nanoparticle composites". Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/7894.

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In this thesis, atomic force microscopy (AFM), transmission electron microscopy (TEM) and optical microscopy techniques were used to investigate systematically the self-assembled nanostructure behaviour of two different types of spin-cast polymer thin films: poly(isoprene-b-ethylene oxide), PI-b-PEO diblock copolymers and [poly(9,9-dioctylfluorene-co-benzothiadiazole)]:poly[9,9- dioctyfluorene-co-N-(4-butylphenyl)-diphenylamine], F8BT:TFB conjugated polymer blends. In the particular case of the polymer blend thin films, the morphology of their composites with cadmium selenide (CdSe) quantum dot (QD) nanoparticles was also investigated. For the diblock copolymer thin films, the behaviour of the nanostructures formed and the wetting behaviour on mica, varying the volume fraction of the PEO block (fPEO) and the average film thickness was explored. For the polymer blend films, the effect of the F8BT/TFB blend ratio (per weight), spin-coating parameters and solution concentration on the phase-separated nanodomains was investigated. The influence of the quantum dots on the phase separation when these were embedded in the F8BT:TFB thin films was also examined. It was found that in the case of PI-b-PEO copolymer thin films, robust nanostructures, which remained unchanged after heating/annealing and/or ageing, were obtained immediately after spin coating on hydrophilic mica substrates from aqueous solutions. The competition and coupling of the PEO crystallisation and the phase separation between the PEO and PI blocks determined the ultimate morphology of the thin films. Due to the great biocompatible properties of the PEO block (protein resistance), robust PEO-based nanostructures find important applications in the development of micro/nano patterns for biological and biomedical applications. It was also found that sub-micrometre length-scale phase-separated domains were formed in F8BT:TFB spin cast thin films. The nanophase-separated domains of F8BT-rich and TFB-rich areas were close to one order of magnitude smaller (in the lateral direction) than those reported in the literature. When the quantum dot nanoparticles were added to the blend thin films, it was found that the QDs prefer to lie in the F8BT areas alone. Furthermore, adding quantum dots to the system, purer F8BT and TFB nano-phase separated domains were obtained. Conjugated polymer blend thin films are excellent candidates for alternatives to the inorganic semiconductor materials for use in applications such as light emitting diodes and photovoltaic cells, mainly due to the ease of processing, low-cost fabrication and mechanical flexibility. The rather limited optoelectronic efficiency of the organic thin films can be significantly improved by adding inorganic semiconducting nanoparticles.

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Bier, Frédéric. "Conception et synthèse d’une matrice polymère thermoplastique pour l’obtention de matériaux composites recyclables, résistants au feu et utilisables dans l’industrie". Thesis, Université de Lorraine, 2018. http://www.theses.fr/2018LORR0040.

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De nouvelles matrices thermoplastiques à base de poly(méthacrylate de méthyle) (PMMA) pouvant entrer dans la composition de matériaux composites ont été synthétisées et caractérisées du point de vue de leur température de transition vitreuse (par calorimétrie différentielle à balayage) et de leur dégradation thermique (par analyse thermogravimétrique et par microcalorimétrie). La stratégie suivie était d’incorporer dans les chaînes de PMMA des unités de répétition comportant un groupement latéral phosphoré retardateur de flamme via une copolymérisation radicalaire du MMA avec un monomère phosphoré. Un ensemble de monomères phosphorés retardateurs de flamme ont été synthétisés à partir de l’oxyde de 9,10-dihydro-9-oxa-10-phosphaphenanthrène-10 (DOPO) en faisant varier la nature de la fonction polymérisable (styrénique, acrylique, méthacrylique), la nature de l’atome lié au phosphore (oxygène, carbone, azote) et la longueur du bras espaceur. Nous avons montré qu’en adaptant la structure et la quantité des unités de répétition phosphorées, la température de transition vitreuse du matériau était maintenue proche de celle du PMMA alors que la dégradation thermique des matériaux était déplacée vers de plus hautes températures. Comparativement les mélanges physiques de PMMA et de DOPO avec une même teneur en élément phosphore présentent une température de transition vitreuse significativement plus basse
Novel poly(methyl methacrylate) (PMMA) thermoplastic matrices which can be used in the elaboration of composite materials have been synthesized and characterized from the point of view of their glass transition temperature (by differential scanning calorimetry) and their thermal degradation (by thermogravimetric analysis and by pyrolysis combustion flow calorimetry). The strategy followed was to incorporate in the PMMA chains repeat units comprising a flame retardant phosphorous side group via a radical copolymerization of MMA with a phosphorus-containing monomer. A set of phosphorus-containing flame retardant monomers has been synthesized from 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10 oxide (DOPO) by varying the nature of the polymerizable function (styrenic, acrylic, methacrylic), the nature of the atom bound to the phophore (oxygen, carbon, nitrogen) and the length of the spacer arm. We have shown that by adapting the structure and the quantity of the phosphorus repeating units, the glass transition temperature of the material was kept close to that of the PMMA while the thermal degradation of the materials was shifted to higher temperatures. Comparatively, physical blends of PMMA and DOPO with equivalent phosphorus contents exhibited significantly lower glass transition temperatures

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Chang, Kaiguo. "Synthesis and characterization of conducting polymer-inorganic composite materials /". View online ; access limited to URI, 2000. http://0-wwwlib.umi.com.helin.uri.edu/dissertations/dlnow/3108646.

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Książki na temat "Copolymars composites"

Saini, Parveen, red. Fundamentals of Conjugated Polymer Blends, Copolymers and Composites. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119137160.

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Stoĭko, Fakirov, red. Handbook of thermoplastic polyesters: Homopolymers, copolymers, blends, and composites. Weinheim: Wiley-VCH, 2002.

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Naik, Hemantkumar Amratlal. Novel crosslinkable polyethersulphone copolymers as candidate matrix materials for composites. Birmingham: University of Birmingham, 1989.

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Wilkinson, A. N. Copolymers and structural composites formed by reaction injection moulding: RIM. Manchester: UMIST, 1990.

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Manners, Ian. Synthetic metal-containing polymers. Weinheim: Wiley-VCH, 2004.

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M, Hergenrother P., Bass R. G i Langley Research Center, red. Synthesis of imide/arylene ether copolymers for adhesives and composite matrices. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1991.

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Shirō, Kobayashi, i SpringerLink (Online service), red. Polymer Materials: Block-Copolymers, Nanocomposites, Organic/Inorganic Hybrids, Polymethylenes. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010.

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Wash.) IEEE Photovoltaic Specialists Conference (37th 2011 Seattle. Oligomeric dithienopyrrole-thienopyrrolodione (DTP-TPD) donor-acceptor copolymer for organic photovoltaics: Preprint. Golden, CO]: National Renewable Energy Laboratory, 2011.

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Synthetic metal-containing polymers. Weinheim: Wiley-VCH, 2004.

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Części książek na temat "Copolymars composites"

Ji, S., H. Gui, G. Guan, M. Zhou, Q. Guo i M. Y. J. Tan. "Designing Waterborne Protective Coatings Through Manipulating the Nanostructure of Acrylic-Based Nanocomposites". W Lecture Notes in Civil Engineering, 113–25. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-3330-3_14.

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AbstractWaterborne coatings with intended functionalities have been designed by manipulating acrylic-based nanocomposites with different nanostructures. Taking advantage of the favorable structure of acrylic copolymers, three waterborne coatings with various desired properties were created through molecular engineering either by copolymerizing with other components or through nanocomposite formation. This approach was demonstrated by synthesizing acrylic-based waterborne coatings with three different nanostructures, namely homogeneous, worm-like, and spherical-like nanostructures. The properties of coating samples prepared by this new approach and by traditional physical blending were compared experimentally, which revealed that the incorporation of 3-methacryloxypropyltrimethoxysilane (MPS)-modified nanoparticle TiO2 in an acrylic base enabled the formation of a nanocomposite with nanoparticles uniformly distributed in the acrylic base. The coating film with this acrylic-TiO2 nanocomposite showed significantly better UV absorption performance than the coating made by physical blending. The copolymerization of acrylic copolymers with an organic polymer (alkyd) created a worm-like nanostructure of acrylic–alkyd composite that allowed uniform distribution of the acrylic–alkyd nanocomposite in a more closely packed dense coating film, leading to enhanced barrier property and significantly improved corrosion resistance as confirmed by electrochemical impedance spectroscopy and salt spray tests. The copolymerization of acrylic monomers with an inorganic polymer (polydimethylsiloxane [PDMS]) led to a spherical-like nanostructure of acrylic–PDMS composite film. The formation of this nanostructure arose from the migration of PDMS segments, and a PDMS-rich phase formed on the film’s surface, which resulted in a coating film with PDMS functionalities such as low dirt-picking behavior. Overall, these three cases demonstrated that acrylic copolymer are an excellent base for developing various nanocomposite waterborne coatings with different functionalities through copolymerization and that the nanocomposites with different nanostructures have a significant influence on the coatings’ performance.

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Chandrasekhar, Prasanna. "“Composites” (Blends) and Copolymers". W Conducting Polymers, Fundamentals and Applications, 253–74. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-5245-1_10.

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Minkova, L. I., i M. C. Michailov. "Thermomechanical Behaviour of Graft Styrene Copolymers and their Composites". W Polymer Composites, redaktor Blahoslav Sedlácek, 275–82. Berlin, Boston: De Gruyter, 1986. http://dx.doi.org/10.1515/9783110856934-023.

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Galli, P., J. C. Haylock i T. Simonazzi. "Manufacturing and properties of polypropylene copolymers". W Polypropylene Structure, blends and composites, 1–24. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0521-7_1.

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Haynes, Dahlia, Mihaela C. Stefan i Richard D. McCullough. "Conjugated-Insulating Block Copolymers: Synthesis, Morphology, and Electronic Properties". W Semiconducting Polymer Composites, 299–330. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2013. http://dx.doi.org/10.1002/9783527648689.ch11.

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Naseem, Z., K. Sagoe-Crentsil i W. Duan. "Graphene-Induced Nano- and Microscale Modification of Polymer Structures in Cement Composite Systems". W Lecture Notes in Civil Engineering, 527–33. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-3330-3_56.

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AbstractRedispersible polymers such as ethylene–vinyl acetate copolymer (EVA) have attracted attention in construction due to their enhanced flexural strength, adhesion, flexibility and resistance against water penetration. However, EVA particles cluster in a highly alkaline cementitious matrix and exhibit poor interaction with the cement matrix. The underlying mechanism of poor dispersibility of EVA is attributed to hydrophobic groups of polymers, a variation in the adsorption rate and molecular diffusion to the interface where they cluster together. This phenomenon can negatively affect the fresh properties of cement and produce a weak microstructure, adversely affecting the resulting composites’ performance. This study highlights how graphene oxide (GO) nanomaterial alters the nano- and microscale structural characteristics of EVA to minimize the negative effects. Transmission electron microscopy (TEM) revealed that the GO sheets modify EVA’s clustered nanostructure and disperse it through electrostatic and steric interactions. Furthermore, scanning electron microscopy (SEM) confirmed altered microscale structural characteristics (viz. surface features) by GO. The altered and enhanced material scale engineering performance, such as the compressive strength of the resulting cement composite, was notable.

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Monasse, B., i J. M. Haudin. "Molecular structure of polypropylene homo- and copolymers". W Polypropylene Structure, blends and composites, 3–30. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0567-5_1.

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Cheng, S. Z. D., J. J. Janimak i J. Rodriguez. "Crystalline structures of polypropylene homo- and copolymers". W Polypropylene Structure, blends and composites, 31–55. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0567-5_2.

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Nguyen, Thien Phap, i Pascale Jolinat. "Conjugated Polymer Composites and Copolymers for Light-Emitting Diodes and Laser". W Semiconducting Polymer Composites, 427–55. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2013. http://dx.doi.org/10.1002/9783527648689.ch15.

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Li, Jiaxing, Yongshun Huang i Dadong Shao. "Conjugated Polymer-Based Composites for Water Purification". W Fundamentals of Conjugated Polymer Blends, Copolymers and Composites, 581–618. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119137160.ch11.

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Streszczenia konferencji na temat "Copolymars composites"

Calvert, Paul D., Mualla Oner, Jeremy Burdon, Peter C. Rieke i Kelly Farmer. "Block copolymers for biomimetic composites". W 1993 North American Conference on Smart Structures and Materials, redaktor Vijay K. Varadan. SPIE, 1993. http://dx.doi.org/10.1117/12.148492.

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Gonzalez-Gutierrez, Joamin, Zerihun Mellese Megen, Bernd Steffen von Bernstorff i Igor Emri. "Shear creep compliance of polyoxymethylene copolymers with different molecular weights". W TIMES OF POLYMERS (TOP) AND COMPOSITES 2014: Proceedings of the 7th International Conference on Times of Polymers (TOP) and Composites. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4876770.

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Simachev, Aleksandr, Ivan Storozhuk, Nadezhda Pavlukovich, Elena Platonova, Ekaterina Platonova, Vladislav Shevtsov i Aleksandr Tereshkov. "Copolysulfones with increased heat resistance". W IV International Forum Advances in Composite Science and Technologies (Moscow, 2 – 3 December 2021). "Publishing company "World of science", LLC, 2022. http://dx.doi.org/10.15862/67mnnpk22-02.

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In order to obtain polyethersulfones with an increased glass transition temperature, copolyethersulfones were synthesized based on 4,4'-dioxydiphenylsulfone, phenolphthalein, and 4,4'-dichlorodiphenylsulfone. It is shown that with an increase in the content of elementary units based on phenolphthalein, the glass transition temperature of the copolymers smoothly increases by 25oC. The resulting copolymers were studied by differential scanning calorimetry, gel permeation chromatography, and thermogravimetric analysis.

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Piotto, S., S. Concilio, P. Iannelli, F. Mavelli, Alberto D’Amore, Domenico Acierno i Luigi Grassia. "DDFT Simulations of the Assembly of Block Copolymers in Confined Systems". W IV INTERNATIONAL CONFERENCE TIMES OF POLYMERS (TOP) AND COMPOSITES. AIP, 2008. http://dx.doi.org/10.1063/1.2989067.

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Davydova, N. K., O. V. Sinitsyna i K. E. Zinoviev. "Preparation of synthetic copolymers potentially capable to interact with biomacromolecules". W 6TH INTERNATIONAL CONFERENCE ON TIMES OF POLYMERS (TOP) AND COMPOSITES. AIP, 2012. http://dx.doi.org/10.1063/1.4738449.

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OYA, YUTAKA, NAOFUMI UMEMOTO i TOMONAGA OKABE. "Changes in Micro-Phase Separation of Di-Block Copolymer Melts Induced by a Circle Fiber". W American Society for Composites 2018. Lancaster, PA: DEStech Publications, Inc., 2018. http://dx.doi.org/10.12783/asc33/25966.

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Penco, M., G. Spagnoli, S. Della Sciucca, F. Samperi, R. Mendichi, Alberto D’Amore, Domenico Acierno i Luigi Grassia. "EFFECT ON STRUCTURAL RELAXATION OF THE POLY(METHYL-METHACRYLATE) COPOLYMERS CHAIN FLEXIBILITY". W IV INTERNATIONAL CONFERENCE TIMES OF POLYMERS (TOP) AND COMPOSITES. AIP, 2008. http://dx.doi.org/10.1063/1.2989037.

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Di Lorenzo, Maria Laura, i René Androsch. "Random butene-1/ethylene copolymers: Influence of composition on the three-phase structure". W TIMES OF POLYMERS (TOP) AND COMPOSITES 2014: Proceedings of the 7th International Conference on Times of Polymers (TOP) and Composites. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4876801.

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Holzworth, Kristin, Gregory Williams, Bedri Arman, Zhibin Guan, Gaurav Arya i Sia Nemat-Nasser. "Polyurea With Hybrid Polymer Grafted Nanoparticles: A Parametric Study". W ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-88395.

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The basis of this research is to mitigate shock through material design. In this work, we seek to develop an understanding of parametric variations in polyurea-based nano-composite materials through experimental characterization and computational modeling. Blast-mitigating applications often utilize polyurea due to its excellent thermo-mechanical properties. Polyurea is a microphase-separated segmented block copolymer formed by the rapid reaction of an isocyanate component and an amine component. Block copolymers exhibit unique properties as a result of their phase-separated morphology, which restricts dissimilar block components to microscopic length scales. The soft segments form a continuous matrix reinforced by the hard segments that are randomly dispersed as microdomains. The physical properties of the separate phases influence the overall properties of the polyurea. While polyurea offers a useful starting point, control over crystallite size and morphology is limited. For compositing, the blending approach allows superb control of particle size, shape, and density; however, the hard/soft interface is typically weak for simple blends. Here, we overcome this issue by developing hybrid polymer grafted nanoparticles, which have adjustable exposed functionality to control both their spatial distribution and interface. These nano-particles have tethered polymer chains that can interact with their surrounding environment and provide a method to control well defined and enhanced nano-composites. This approach allows us to adjust a number of variables related to the hybrid polymer grafted nanoparticles including: core size and shape, core material, polymer chain length, polymer chain density, and monomer type. In this work, we embark on a parametric study focusing on the effect of silica nanoparticle size, polymer chain length, and polymer chain density. Preliminary results from experimental characterization and computational modeling indicate that the dynamic mechanical properties of the material can be significantly altered through such parametric modifications. These efforts are part of an ongoing initiative to develop elastomeric composites with optimally designed compositions and characteristics to manage blast-induced stress-wave energy.

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Sparnacci, Katia, Diego Antonioli, Valentina Gianotti, Federico Ferrarese Lupi, Tommaso Jacopo Giammaria, Gabriele Seguini, Michele Perego i Michele Laus. "Surface engineering with functional random copolymers for nanolithographic applications". W VIII INTERNATIONAL CONFERENCE ON “TIMES OF POLYMERS AND COMPOSITES”: From Aerospace to Nanotechnology. Author(s), 2016. http://dx.doi.org/10.1063/1.4949745.

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Raporty organizacyjne na temat "Copolymars composites"

Harris, James, Yossef A. Elabd, Eugene Napadensky i Paul Moy. Thermal Processing and Composite Laminate Formation of Ionic Block Copolymers for Protective Clothing. Fort Belvoir, VA: Defense Technical Information Center, grudzień 2002. http://dx.doi.org/10.21236/ada410616.

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Yang, Dali, Kevin Mark Hubbard, David James Devlin, Kevin C. Henderson i Robin Montoya Pacheco. Effect of Filler Concentration on Thermal Stability of Vinyl Copolymer Elastomer (VCE) Composites. Office of Scientific and Technical Information (OSTI), marzec 2015. http://dx.doi.org/10.2172/1172203.

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Wnek, Gary E., i Thomas W. Smith. Block Copolymer Composites: A Bio-Optic Synthetic System for Dynamic Control of Refractive Index. Fort Belvoir, VA: Defense Technical Information Center, czerwiec 2005. http://dx.doi.org/10.21236/ada434903.

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