Relevant bibliographies by topics / Copolymers – Thermal properties

Academic literature on the topic 'Copolymers – Thermal properties'

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Published: 4 June 2021
Last updated: 29 January 2023

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Journal articles on the topic "Copolymers – Thermal properties"

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Eliza, Eliza, Desnelli Desnelli, Ady Mara, and Fahma Riyanti. "Study of Effect of Weight Ratio on Copolymerization of Chitosan and Acrylamide." Indonesian Journal of Fundamental and Applied Chemistry 6, no. 3 (October 20, 2020): 96–102. http://dx.doi.org/10.24845/ijfac.v6.i3.96.

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In this research, chitosan copolymer synthesis with acrylamide has been carried out by varying weight of chitosan and acrylamide, namely 2:3, 3:2 and 1:1 using a microwave oven. The copolymers characterization was carried out using FTIR, XRD, SEM and TGA/DTA. The results of the synthesis of chitosan copolymer with acrylamide were obtained the largest percentage of grafting at a ratio of 2:3. From the results of FTIR analysis showed that the copolymer had been successfully synthesized. XRD analysis showed that the copolymers synthesized have amorphous properties compared to chitosan. The results of SEM analysis, the copolymers had a porous structure. Thermal analysis showed that the copolymers have better thermal stability than chitosan. The swelling ability of the CA23 copolymer was higher than that of the CA32 and CA11 copolymers. The chitosan-acrylamide copolymer which was synthesized in a ratio of 2:3 has better properties
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Nevin Cankaya, Nevin Cankaya. "Grafting of Chitosan: Structural, Thermal and Antimicrobial Properties." Journal of the chemical society of pakistan 41, no. 2 (2019): 240. http://dx.doi.org/10.52568/000735/jcsp/41.02.2019.

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In this study, some new chitosan materials were synthesized by the grafting of chitosan with the monomers such as 1-vinylimidazole (VIM), methacrylamide (MAm) and 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS). First of all, chitosan methacrylate was prepared by esterification of primary -OH group with methacryloyl chloride a 25.13% yield by mole. The monomers were grafted into chitosan methacrylate via free radical polymerization using 2,2and#39;-Azobisisobutyronitrile as an initiator in N,N-dimethylformamide. The graft copolymers were characterized by FT-IR spectra and elemental analysis. Thermal stabilities of the graft copolymers were determined by TGA (thermo gravimetric analysis) method. The synthesized chitosan methacrylate and its graft copolymers were tested for their antimicrobial activity against bacteria and yeast.
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Barim, Gamze, and Mustafa Gokhun Yayla. "Copolymerization of 4-Acetylphenyl Methacrylate with Ethyl Methacrylate: Synthesis, Characterization, Monomer Reactivity Ratios, and Thermal Properties." International Journal of Polymer Science 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/643789.

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Methacrylates have high glass transition temperature (Tg) values and high thermal stability. A new methacrylate copolymer, poly(4-acetylphenyl methacrylate-co-ethyl methacrylate) (APMA-co-EMA), was synthesized. The thermal behaviors of copolymers were investigated by differential scanning calorimetry and thermogravimetric analysis. They behaved as new single polymers with singleTg’s and the thermal stability of the copolymers increased with increasing 4-acetylphenyl methacrylate (APMA) fraction, leading to the manufacture of copolymers with desiredTgvalues. Structure and composition of copolymers for a wide range of monomer feed ratios were determined by Fourier transform infrared (FT-IR) and1H-nuclear magnetic resonance (1H-NMR) spectroscopic techniques. Copolymerization reactions were continued up to 40% conversions. The monomer reactivity ratios for copolymer system were determined by the Kelen-Tüdös (ra(APMA)=0.81;rb(EMA)=0.61) and extended Kelen-Tüdös (ra=0.77;rb=0.54) methods and a nonlinear least squares (ra=0.74;rb=0.49) method.
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Li, Ru, Bao Tan Zhang, Bai Ling Liu, Xiu Ning Chen, and Gong Ying Wang. "Structure and Properties of Poly(Diphenylsiloxane-Co-Dimethylsiloxane) Modified MQ Silicone Resin." Advanced Materials Research 496 (March 2012): 109–15. http://dx.doi.org/10.4028/www.scientific.net/amr.496.109.

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A novel kind of poly(diphenylsiloxane-co-dimethylsiloxane)s modified MQ silicone resin were synthesised by the hydrolysis and condensation of diphenyldimethyloxysilane, dimethyldimethyloxy- silane, tetraethyloxysilane and hexamethyldisiloxane. The structure of the copolymers was confirmed by 1H and 29Si NMR. Their molecular weights were determined by GPC. Thermal transitions were characterized by DSC. In addition, the thermal stabilities were evaluated by TGA. Results indicated that the increasing content of phenyl mol% in copolymer enhances the optical and thermal properties of the copolymers. Moreover, it can be used as a potential vinyl terminated component in hydrosilylation materials in PSA and LED encapsulation.
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Nguyen, Thi Phuong Thu, Nadine Barroca-Aubry, Caroline Aymes-Chodur, Diana Dragoe, Gaëlle Pembouong, and Philippe Roger. "Copolymers Derived from Two Active Esters: Synthesis, Characterization, Thermal Properties, and Reactivity in Post-Modification." Molecules 27, no. 20 (October 12, 2022): 6827. http://dx.doi.org/10.3390/molecules27206827.

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Copolymers with two distinguished reactive repeating units are of great interest, as such copolymers might open the possibility of obtaining selective and/or consequent copolymers with different chemical structures and properties. In the present work, copolymers based on two active esters (pentafluorophenyl methacrylate and p-nitrophenyl methacrylate) with varied compositions were synthesized by Cu(0)-mediated reversible deactivation radical polymerization. This polymerization technique allows the preparation of copolymers with high to quantitative conversion of both comonomers, with moderate control over dispersity (Đ = 1.3–1.7). Additionally, by in-depth study on the composition of each copolymer by various techniques including elemental analysis, NMR, FT-IR, and XPS, it was possible to confirm the coherence between expected and obtained composition. Thermal analyses by DSC and TGA were implemented to investigate the relation between copolymers’ composition and their thermal properties. Finally, an evaluation of the difference in reactivity of the two monomer moieties was confirmed by post-modification of copolymers with a primary amine and a primary alcohol as the model.
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Sun, Yu, Yazhen Wang, Li Liu, and Tianyuan Xiao. "The Preparation, Thermal Properties, and Fire Property of a Phosphorus-Containing Flame-Retardant Styrene Copolymer." Materials 13, no. 1 (December 27, 2019): 127. http://dx.doi.org/10.3390/ma13010127.

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A 9,10-dihydro-9-oxa-10-phosphaphenanthrene 10-oxide (DOPO) acrylate, (6-oxidodibenzo [c,e][1,2] oxaphosphinin-6-yl) methyl acrylate (DOPOAA), has been prepared. Copolymers of styrene (St) and DOPOAA were prepared by emulsion polymerization. The chemical structures of copolymers containing levels of DOPOAA were verified using Fourier transform infrared (FT-IR) spectroscopy and 1H nuclear magnetic resonance (1H-NMR) spectroscopy. The thermal properties and flame-retardant behaviors of DOPO-containing monomers and copolymers were observed using thermogravimetric analysis and micro calorimetry tests. From thermogravimetric analysis (TGA), it was found out that the T5% for decomposition of the copolymer was lower than that of polystyrene (PS), but the residue at 700 °C was higher than that of PS. The results from micro calorimetry (MCC) tests indicated that the rate for the heat release of the copolymer combustion was lower than that for PS. The limiting oxygen index (LOI) for combustion of the copolymer rose with increasing levels of DOPOAA. These data indicate that copolymerization of the phosphorus-containing flame-retardant monomer, DOPOAA, into a PS segment can effectively improve the thermal stability and flame retardancy of the copolymer.
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Sidra, Lala Rukh, Nafeesa Mushtaq, Guofei Chen, and Xingzhong Fang. "Synthesis of high Tg and organosoluble poly(N-arylene benzimidazole ether imide) copolymers by C–N/C–O coupling reaction." High Performance Polymers 30, no. 4 (April 5, 2017): 465–74. http://dx.doi.org/10.1177/0954008317701822.

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A series of poly( N-arylene benzimidazole ether imide) copolymers PEIBIs were prepared from 1H,3′H-5,5′-bis-benzimidazole, bisphenol-A and 4,4′-bis(4-fluorophthalimido)diphenyl ether by nucleophilic displacement polymerization. The resulting copolymers PEIBI(10–90) demonstrated moderate to good solubility in polar aprotic solvents and high glass transition temperatures ( Tgs) of 228–336°C, good thermal stability with 10% weight loss temperatures in the range of 503–548°C. All copolymer films showed good mechanical properties with tensile strengths of 101–130 MPa, tensile moduli of 3.3–4.0 GPa, elongations at break of 5–7%, and also presented low water uptake (0.15–0.34%). The wide-angle X-ray diffraction results revealed the amorphous nature of copolymers. The copolymer PEIBI-80 showed good balance in solubility, thermal and mechanical properties.
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Pascual-Jose, B., Alireza Zare, Silvia De la Flor, José Antonio Reina, M. Giamberini, and A. Ribes-Greus. "Dielectric Properties in Oriented and Unoriented Membranes Based on Poly(Epichlorohydrin-co-Ethylene Oxide) Copolymers: Part III." Polymers 14, no. 7 (March 28, 2022): 1369. http://dx.doi.org/10.3390/polym14071369.

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The dielectric spectra and conductivity properties of neat poly(epichlorohydrin-co-ethylene oxide)(PECH-co-EO) copolymer and two modified copolymers with a 20% or 40% of dendron 3,4,5-tris[4-(n-dodecan-1-yloxy)benzyloxy] benzoate units were analysed. A process of thermal orientation was applied to the copolymers to fine-tune the molecular motion of the side chains and determine their validity for cation transport materials. The study was conducted using Dielectric Thermal Analysis (DETA). The spectra of the modified unoriented and oriented copolymers consisted of five dielectric relaxations (δ, γ, β, αTg, and αmelting). The analysis of the relaxations processes shows that as the grafting with the dendron units increases, both the lateral and main chains have a greater difficulty moving. The thermal orientation induces in the main chain partial crystallization, including the polyether segments, and modifies the cooperative motion of the main chain associated with the glass transition (αTg). A deep analysis of the electrical loss modulus revealed that the degree of modification only modifies the temperature peak of each relaxation, and this effect is more perceived if the dendron unit content is higher (40%). The thermal orientation process seems equal to the spectra of CP20-O and CP40-O to the point that the degree of modification does not matter. Nevertheless, the fragility index denotes the differences in the molecular motion between both copolymers (40% and 20%) due to the thermal orientation. The study of the electric conductivity showed that the ideal long-range pathways were being altered by neither the thermal orientation process nor the addition of dendrimers. The analysis of the through-plane proton conductivity confirmed that the oriented copolymer with the highest concentration of dendrimers was the best performer and the most suitable copolymer for proton transport materials.
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Naddeo, Marco, Andrea Sorrentino, and Daniela Pappalardo. "Thermo-Rheological and Shape Memory Properties of Block and Random Copolymers of Lactide and ε-Caprolactone." Polymers 13, no. 4 (February 19, 2021): 627. http://dx.doi.org/10.3390/polym13040627.

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Biodegradable block and random copolymers have attracted numerous research interests in different areas, due to their capability to provide a broad range of properties. In this paper, an efficient strategy has been reported for preparing biodegradable PCL-PLA copolymers with improved thermal, mechanical and rheological properties. Two block-copolymers are synthesized by sequential addition of the cyclic esters lactide (L-LA or D,L-LA) and ε-caprolactone (CL) in presence of a dimethyl(salicylaldiminato)aluminium compound. The random copolymer of L-LA and CL was synthetized by using the same catalyst. Chain structure, molar mass, thermal, rheological and mechanical properties are characterized by NMR, SEC, TGA, DSC, Rheometry and DMTA. Experimental results show that by changing the stereochemistry and monomer distribution of the copolymers it is possible to obtain a variety of properties. Promising shape-memory properties are also observed in the di-block copolymers characterized by the co-crystallization of CL and L-LA segments. These materials show great potential to substitute oil-based polymers for packaging, electronics, and medicine applications.
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Jubsilp, Chanchira, Sarawut Rimdusit, and Tsutomu Takeichi. "Effect of Rubber Contents on Tribological and Thermomechanical Properties of Polybenzoxazine." Applied Mechanics and Materials 576 (June 2014): 75–79. http://dx.doi.org/10.4028/www.scientific.net/amm.576.75.

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Bisphenol-A/aniline based polybenzoxazine (PBZ) modified with amine terminated butadiene–acrylonitrile (ATBN) were prepared. The tribological and thermomechanical properties as well as thermal stability of the PBZ/ATBN copolymers were investigated by ball-on-disc tribometer, dynamic mechanical analysis (DMA), universal test machine and thermogravimetric analysis (TGA). The inclusion of ATBN at a mass fraction of 5% was found to greatly increase friction coefficient and wear resistance of the copolymers. DMA measurements showed that the storage modulus and the glass transition temperature of the PBZ can be maintained with an addition of ATBN in the range of 1-5wt%. Moreover, flexural property measurements indicated that the flexural strength of the copolymer increased with increasing of ATBN content up to 10wt% whereas TGA results revealed that an increase of the PBZ content can help improve thermal stability of the copolymers.
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Dissertations / Theses on the topic "Copolymers – Thermal properties"

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Sanguanchaipaiwong, Vorapat Biotechnology &amp Biomolecular Sciences Faculty of Science UNSW. "Biosynthesis and characterisation of polyhydroxyalkanoate based natural-synthetic hybrid copolymers." Awarded by:University of New South Wales. School of Biotechnology and Biomolecular Sciences, 2006. http://handle.unsw.edu.au/1959.4/28313.

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Natural-synthetic hydrid biomaterials have been isolated from the growth of Alcaligenes latus and Pseudomonas oleovorans in the presence of diethylene glycol (DEG). A. latus could cometabolise DEG with 10 g/L glucose, while DEG was consumed by P. oleovorans with 20 mM sodium octanoate or octanoic acid. The presence of DEG in bioprocessing systems for the production of short chain length (scl-) and medium chain length (mcl-) PHAs consequently lowered cell viability and PHA yield. Cell morphology was slightly changed, but the PHA inclusion bodies apparently were not. DEG affected the composition of the mclPHA which was confirmed to be polyhydroxyoctanoate (PHO) with a significant increase in the C8 component. Gas chromatography-mass spectrometry (GC-MS) was used to quantitatively monitor DEG in the system and revealed its cellular adsorption. Intracellularly, the DEG significantly decreased the molar weight of the mclPHA and sclPHA. P1PH NMR, 2-D COSY and HSQC spectra confirmed that the polymer samples consisted of PHA chains terminated by DEG. Similar to the cultivation of P. oleovorans with DEG, the presence of PEG200 and PEG400 also had an effect on cell growth, PHO yield and cell viability. Furthermore, a hybrid copolymer of PHO-PEG200 was synthesised. The synthesis of these natural-synthetic hybrid copolymers could lead the way for a wide variety of PHA-PEG copolymers with a range of bioactive properties. All thermal properties of PHB were higher than those of PHB-DEG. This may be due to a combination of lower PHB molecular weight and termination of the chains by DEG, i.e. ???DEGylation???. However, PHB-DEG was more elastomeric when compared to PHB, showing properties similar to its copolymer with 20 mol% 3-hydroxyvalerate. Contact angles revealed that the PHB-DEG film was slightly more hydrophilic than PHB. Despite the large difference in their respective proportions, the comparatively small DEG component exerted an influence on chain confirmation, such that solvent casting under humid conditions apparently induced self-assembly and formed a disordered microporous film. DEGylation of PHO also had noticeable effects on the physiochemical properties of the biopolymer. A major decrease in molecular weight, together with the termination of hydrophobic PHO chains with hydrophilic end-groups resulted in changes to its thermal properties when compared to PHO. In comparison to PHO, solvent cast films of PHO-DEG were apparently less flexible, but more hydrophilic.
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Tyagi, D. K. "Structure-property relationships in segmented copolymers." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/49948.

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The structure-property relationships for various segmented copolymers were investigated. A number of mechanical and thermal characteristics were determined. The morphology was characterized by SAXS with respect to size and dispersion of domains; degree of phase separation and the domain interfacial thickness. a. Novel segmented copolymers were synthesized using amino terminated polydimethylsiloxane oligomers as the soft component and various hard component. lt was found that the performance of these copolymers was affected by the varying the hard segment linkages, hard segment content, soft segment MW, stiffness of the siloxane backbone, and amount of chain extender. Two-phase nature of these copolymers was verified by dynamic mechanical, thermal, and SAXS studies. The phase separation was found to occur in these copolymers with as little as 6% HS. These materials displayed behavior similar to the segmented polyurethanes and were found to be superior to the unfilled silicone elastomers. The final materials were used as reasonable models for investigating various methods for determining the interfacial layer thickness between the hard and soft phase. Specifically, due to the fact that there is no hard segment length distribution as is the usual case for segmented urethanes, these materials have some degree of model characteristics. Utilizing Porod's law, and appropriate analysis, both positive and negative deviations were found in the systematic series of copolymers with the degree of positive and negative character dependent upon composition. Negative deviations were accounted for in terms of a finite interfacial thickness which turned out to be relatively small as anticipated, while the positive deviations arose due to isolated hard segments that reside within the soft segment matrix, concentration fluctuations. ln calculating the interfacial thickness, several methods were applied and in general, close agreement was obtained. Finally, correlation function analysis in conjunction with determination of the coherent Porod lengths, etc. were determined and discussed accordingly. b. The structure-property behavior of novel 'water extended' segmented polyurethane-urea copolymers was also investigated. These copolymers were synthesized by utilizing the dehydration characteristics of tertiary alcohols at sufficiently high temperature in weak acidic medium. Mechanical, thermal, dynamic mechanical, and x-ray experiments were carried out to characterize the morphology and properties of these segmented copolymers of systematically varying hard segment content, soft segment MW, block length, and hard segment type. lt was observed that these properties depended primarily on the degree of order in the hard domains and the order could be improved by increasing either the HS content at constant soft segment MW or soft segment molecular weight at the same HS content. The results obtained for these materials were compared with those from conventional polyurethanes to investigate the effect of intermolecular hydrogen bonding on molecular arrangement. c. The final series of segmented copolymers studied were based on polysulfone and polydimethylsiloxane, synthesized by solution polymerization. lt is shown that by varying the length of the segments for each phase and their relative content, it is possible to alter the mechanical and thermal characteristics. The mechanical response was also influenced according to which phase is predominantly continuous. In addition to dynamic mechanical and SAXS measurements, the evidence of the two-phase structure was obtained by TEM.
Ph. D.
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Ramacieri, Patricia. "Microstructure and kinetics of thermal degradation of alkene copolymers of vinyl chloride." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=72819.

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Ngaza, Nyashadzashe. "Thermal field-flow fractionation (Thermal FFF) and asymmetrical flow field-flow fractionation (AF4) as new tools for the analysis of block copolymers and their respective homopolymers." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/95836.

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Thesis (MSc)--Stellenbosch University, 2014.
ENGLISH ABSTRACT: Polystyrene-block-poly(ethylene oxide) (PS-b-PEO) copolymers contain a hydrophilic PEO block and a hydrophobic PS block. PS and PEO have different affinities for most organic solvents and as a result, the PS-b-PEO copolymers are difficult to characterize in solution. In order to achieve a complete characterization of their molecular heterogeneity different techniques have been used. Recently FFF has become a cutting edge technology for polymer analysis because it possesses a number of advantages over conventional SEC and other liquid chromatographic techniques. The mild operating conditions allow the analysis of delicate and sensitive complex analytes such as complex polymer assemblies. The ability to analyze polymers with ultrahigh molar masses has also contributed to its significance in the characterization of polymers. In this study, the FFF behaviour of PS-b-PEO copolymers as well as PS and PEO homopolymers was investigated using Thermal FFF in different organic solvents and AF4. The aim of the study was the correlation of the thermodynamic quality of the solvents and the elution behaviour of the polymers. Unfortunately, PEO homopolymers have been found to interact with the membrane in AF4. Therefore, they were best characterized in organic solvents using Thermal FFF. In contrast to AF4 no specific interactions occurred due to the absence of a membrane. Results for Thermal FFF showed that in all utilized solvents, PS and PEO homopolymers were separated in the direction of increasing molar mass. For PS-b-PEO copolymers the retention in selective (good) solvents for PS was dependent on the molar mass of the PS block in the block copolymer. This was explained by the fact that in poor solvents PEO adopts a collapsed coil conformation while PS is present in extended random coil conformation. Results also showed that polymer retention was dependent on the temperature programme utilized. The fractionations by Thermal FFF indicated that some of the PS-b-PEO copolymer samples contained PS and PEO homopolymers as by-products. After semi-preparative fractionation these homopolymers were qualitatively identified using FTIR spectroscopy.
AFRIKAANSE OPSOMMING: Polistireen-blok-poli(etileenoksied) (PS-b-PEO) ko-polimere bevat 'n hidrofiliese politetileen oksied (PEO) blok en 'n hidrofobiese polistireen (PS) blok. PS en PEO het verskillende affiniteite vir die meeste organiese oplosmiddels, dit bemoeilik die karakterisering van PS-b-PEO ko-polimere in oplossing. Ten einde 'n volledige karakterisering van hul molekulêre heterogeniteit te bepaal moet ‘n verskeidenheid van tegnieke gebruik word. Onlangs het veldvloeifraksionering (FFF) baie grond gewen tov polimeer analise, aangesien dit verskeie voordele het bo tradisionele chromatografiese tegnieke soos grootte-uitsluitingschromatografie (SEC). Die ligte operasionele omstandighede laat die ontleding van ‘n verskeidenheid van polimere toe, enige iets van delikate polimeer komplekse tot ultra hoë molekulêre massa. In hierdie studie is die FFF gedrag van PS-b-PEO ko-polimere asook PS en PEO homopolimere ondersoek met behulp van Termiese FFF(ThFFF) in verskillende organiese oplosmiddels en onsimmetriese vloei-veldvloeifraksionering(AF4). Die doel van die studie was om die verband tussen die termodinamiese gehalte van die oplosmiddels en die eluering gedrag van die polimere te bepaal. Analise van PEO homopolimere was onsuksesvol aangesien daar interaksie was met die membraan. PEO is dus net geanaliseer in organise oplosmiddels met behulp van ThFFF, aangesien daar geen membraan is nie. Analise met ThFFF het gewys dat skeiding plaasvind volgens ‘n toename in molekulêre massa in organise oplosmiddels. Vir PS-b-PEO ko-polimere die retensie in selektiewe (goeie) oplosmiddels vir PS was afhanklik van die molekulêre massa van die PS blok in die ko-polimeer. ‘n Moontlike teorie is dat die PEO blok ‘n ineengestorte spoel struktuur vorm terwyl die PS blok ‘n uitgestrekte lukraake vorm aan neem. Resultate het ook getoon dat die polimeer retensie afhanklik was van die temperatuur program wat gebruik is. Die fraksionering deur ThFFF het aangedui dat sommige van die PS-b-PEO kopolimeer monsters bestaan het uit PS en PEO homopolimere as by-produkte. Hierdie is kwalitatief bewys deur analise van die fraksies na fraksionering van die ko-polimere met behulp van FTIR spektroskopie.
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Briceno, Garcia Ruben Dario. "Crosslinking of ethylene copolymers from epoxy chemistry." Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0037.

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La plupart des couches d'isolation de câbles pour la moyenne tension "MV" et haute tension "HV" sont fabriquées en polyéthylène réticulé (XLPE) par voie peroxyde. L'impact des sous-produits de réaction sur les propriétés et la nécessité d'une étape de dégazage au cours du processus sont les principaux problèmes liés à cette technologie. Cette étude se concentre sur le développement d'une méthode de réticulation alternative sans les problèmes liés aux sous-produits. Des copolymères d’éthylène/époxy ont été réticulés thermiquement en utilisant un agent aminoacide pour créer des liaisons covalentes entre les fonctions époxydes. L’influence de différents paramètres sur la cinétique de réaction tels que la température de réticulation, les proportions aminoacide/époxy, la taille des particules de l’aminoacide et la teneur en époxy dans les copolymères a été étudiée par techniques de caractérisation telles que : rhéologie dynamique, spectrométrie FTIR, microscopie à balayage électronique et calorimétrie différentielle. En outre, l'étude de la structure du réseau avant et pendant un vieillissement thermique a été effectuée par différentes techniques (mesures de gonflement, spectroscopie FTIR, propriétés de traction et thermoporosimétrie) sur deux types de réseaux : un pré-contraint et un autre non-contraint. Enfin, une caractérisation des propriétés électriques par spectroscopie diélectriques et mesures de claquage électrique a été faite. Les résultats concernant les cinétiques de réaction, les propriétés thermomécaniques et le comportement électrique ont montré que la formulation développée dans cette étude peut être utilisée pour une application de câble
Most of insulation layers of cables for medium voltage “MV” and high voltage “HV” applications are made of crosslinked polyethylene (XLPE) by peroxide technology. The impact of reaction by-products on properties and the consequential need of a degassing stage during the process are the main problems related to this technology. This study focuses on the development of an alternative crosslinking method without by-products issues. Epoxy-ethylene copolymers were thermally crosslinked by using an amino-acid agent to create covalent cross-links between epoxide functions. Influence of several parameters on kinetic reactions such as crosslinking temperature, amino acid/epoxy proportions, size particle of amino acid and epoxy content in copolymers were studied by characterization techniques such as: dynamic rheology, FTIR spectrometry, SEM microscopy and differential calorimetry. In addition, study of the network structure before and during a thermal aging was done on a pre-constrained and a non-constrained network by different techniques (swelling ratio measurement, FTIR spectroscopy, tensile properties and thermoporosimetry analysis). Finally, a characterization of electrical properties by dielectric spectroscopy and breakdown measurements was done. Results related to reaction kinetic, thermo-mechanical properties and electrical behavior have shown that the developed formulation can be used for cable application
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FERRETO, HELIO F. R. "Estudo da sintese copolimero olefínico à base de politetrafluoroetileno (PTFE) por meio da enxertia induzida por radiação gama." reponame:Repositório Institucional do IPEN, 2006. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11420.

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Made available in DSpace on 2014-10-09T12:51:42Z (GMT). No. of bitstreams: 0
Made available in DSpace on 2014-10-09T14:08:37Z (GMT). No. of bitstreams: 0
Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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Koh, Andrew Yew Chiang. "Preparation, characterisation and properties of thermally-responsive copolymers and emulsions : a thesis submitted towards the degree of Doctor of Philosophy / by Andrew Yew Chiang Koh." 2003. http://hdl.handle.net/2440/21984.

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"May 2003"
Includes bibliographical references (leaves 261-270)
xvi, 271, [16] leaves : ill. ; 30 cm.
Title page, contents and abstract only. The complete thesis in print form is available from the University Library.
Thesis (Ph.D.)--University of Adelaide, School of Chemistry and Physics, 2003
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Koh, Andrew Yew Chiang. "Preparation, characterisation and properties of thermally-responsive copolymers and emulsions : a thesis submitted towards the degree of Doctor of Philosophy / by Andrew Yew Chiang Koh." Thesis, 2003. http://hdl.handle.net/2440/21984.

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Jang, Yih-Sheng, and 張益盛. "Study on the thermal properties of PDMS/PDPS block copolymers." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/48713476526460345679.

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LAI, FENG-JIE, and 賴夆杰. "The study of syntheses and the thermal properties of (allyloxy) cyclotriphosphazenes and the related copolymers." Thesis, 1991. http://ndltd.ncl.edu.tw/handle/15110530471110210861.

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Books on the topic "Copolymers – Thermal properties"

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CRC handbook of enthalpy data of polymer-solvent systems. Boca Raton, FL: Taylor & Francis, 2006.

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CRC handbook of phase equilibria and thermodynamic data of copolymer solutions. Boca Raton: CRC Press, 2010.

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Busch, Bernhard. Das spezifische Volumen geschmolzener Polymere und Copolymere in Abhängigkeit von Druck und Temperatur. Münster: Lit Verlag, 1990.

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Wohlfarth, Christian. CRC Handbook of Thermodynamic Data of Copolymer Solutions. Taylor & Francis Group, 2001.

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CRC Handbook of Thermodynamic Data of Copolymer Solutions. CRC, 2001.

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Wohlfarth, Christian. CRC Handbook of Thermodynamic Data of Copolymer Solutions. Taylor & Francis Group, 2001.

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Wohlfarth, Christian. CRC Handbook of Thermodynamic Data of Aqueous Polymer Solutions. Taylor & Francis Group, 2004.

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Wohlfarth, Christian. CRC Handbook of Thermodynamic Data of Aqueous Polymer Solutions. Taylor & Francis Group, 2004.

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Wohlfarth, Christian. Crc Handbook of Thermodynamic Data of Aqueous Polymer Solutions. Taylor & Francis Group, 2004.

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CRC Handbook of Thermodynamic Data of Aqueous Polymer Solutions. CRC, 2004.

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Book chapters on the topic "Copolymers – Thermal properties"

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Pionteck, J., and M. Pyda. "pVT Data of Butadiene Copolymers." In Part 2: Thermodynamic Properties – pVT-Data and Thermal Properties, 12–14. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41542-5_4.

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Pionteck, J., and M. Pyda. "pVT data of ethylene-copolymers." In Part 2: Thermodynamic Properties – pVT-Data and Thermal Properties, 15–24. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41542-5_5.

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Pionteck, J., and M. Pyda. "pVT Data of Styrene Copolymers." In Part 2: Thermodynamic Properties – pVT-Data and Thermal Properties, 26–45. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41542-5_7.

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Tsuji, Hideto. "Quiescent Crystallization of Poly(Lactic Acid) and Its Copolymers-Based Materials." In Thermal Properties of Bio-based Polymers, 37–86. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/12_2019_46.

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Sanabria-DeLong, Naomi, Khaled A. Aamer, Sarvesh K. Agrawal, Surita R. Bhatia, and Gregory N. Tew. "Poly(lactide)-Poly(ethylene oxide)-Poly(lactide) Triblock Copolymers: Synthesis and Thermal Properties." In ACS Symposium Series, 156–67. Washington, DC: American Chemical Society, 2006. http://dx.doi.org/10.1021/bk-2006-0939.ch010.

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Pionteck, J., and M. Pyda. "pVT Data of Copolymer of Soy Protein Isolate and Corn Starch." In Part 2: Thermodynamic Properties – pVT-Data and Thermal Properties, 11. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41542-5_3.

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Salim, Nisa V., Jyotishkumar Parameswaranpillai, Bronwyn L. Fox, and Nishar Hameed. "Thermal Properties of Epoxy/Block-Copolymer Blends." In Handbook of Epoxy Blends, 1041–65. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-40043-3_38.

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Salim, Nisa V., Jyotishkumar Parameswaranpillai, Bronwyn L. Fox, and Nishar Hameed. "Thermal Properties of Epoxy/Block Copolymer Blends." In Handbook of Epoxy Blends, 1–25. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-18158-5_38-1.

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Vanderschueren, J., J. Niezette, M. Corapci, G. Yianakopoulos, and L. Aras. "Conductivity and Thermally Stimulated Processes in Ionomers Based on SIS Block Copolymers." In Structure and Properties of Ionomers, 493–99. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3829-8_43.

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Koynov, Kaloian, Azhar Juhari, Tadeusz Pakula, and Krzysztof Matyjaszewski. "Acrylate Based Copolymers by ATRP: The Effect of Molecular Structure on Thermo-Mechanical Properties." In ACS Symposium Series, 297–311. Washington DC: American Chemical Society, 2009. http://dx.doi.org/10.1021/bk-2009-1023.ch020.

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Conference papers on the topic "Copolymers – Thermal properties"

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Saxena, Narendra S., Neeraj Jain, P. Predeep, S. Prasanth, and A. S. Prasad. "Thermal and Mechanical Characterization of Aniline-Formaldehyde Copolymer." In THERMOPHYSICAL PROPERTIES OF MATERIALS AND DEVICES: IVth National Conference on Thermophysical Properties - NCTP'07. AIP, 2008. http://dx.doi.org/10.1063/1.2927593.

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Azmi, A., K. Y. Lau, N. A. Ahmad, Z. Abdul-Malek, and W. A. W. A. Rahman. "Thermal and Breakdown Properties of Polypropylene Homopolymer, Copolymer, and Blend." In 2018 IEEE 7th International Conference on Power and Energy (PECon). IEEE, 2018. http://dx.doi.org/10.1109/pecon.2018.8684178.

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Kafi, A., H. Wu, J. Koo, S. Bateman, and S. Kim. "Additive Manufacturing of Polyamide 6/66 Copolymer Nanocomposites: Thermal and Flammability Properties." In SAMPE 2020 | Virtual Series. NA SAMPE, 2020. http://dx.doi.org/10.33599/382/s.20.0128.

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Kafi, A., H. Wu, J. Koo, S. Bateman, and S. Kim. "Additive Manufacturing of Polyamide 6/66 Copolymer Nanocomposites: Thermal and Flammability Properties." In SAMPE 2020 | Virtual Series. NA SAMPE, 2020. http://dx.doi.org/10.33599/s.20.0128.

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Kafi, A., H. Wu, J. Koo, S. Bateman, and S. Kim. "Additive Manufacturing of Polyamide 6/66 Copolymer Nanocomposites: Thermal and Flammability Properties." In SAMPE 2020 | Virtual Series. NA SAMPE, 2020. http://dx.doi.org/10.33599/nasampe/s.20.0128.

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Brogan, J. A., C. C. Berndt, A. Claudon, and C. Coddet. "The Mechanical Properties of Combustion-Sprayed Polymers and Blends." In ITSC 1996, edited by C. C. Berndt. ASM International, 1996. http://dx.doi.org/10.31399/asm.cp.itsc1996p0221.

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Abstract The mechanical properties of EMAA copolymer are dependent upon the thermal spray processing parameters. The parameters determine coating temperatures which, in turn, affects the microstructure. If the deposition temperature is too low, (104 °C for PFl 13 and 160 °C for PFl 11) coatings have low strengths and low energy to break values. Increased coating temperatures allow the particles to fully coalesce resulting in maximized strength and elongation to break. However, at 271 °C, PFl 11 had visible porosity which decreased both strength and elastic modulus. Pigment acts as reinforcement in the sense that the modulus increased but the elongation to break decreased, thus reducing the energy to break. Water quenching reduces the elastic modulus and yield strength, but increases the elongation to break for both EMAA formulations. The mechanical properties of post consumer commingled plastic and PCCP / EMMA blends improved if the recycled plastic was pre-processed by melt-compounding. Melt compounding increased the strength and toughness by improving the compatibility among the various polymer constituents. The addition of PCCP increases the modulus and yield strength of ethylene methaciylic acid copolymer.
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Holzworth, Kristin, Gregory Williams, Bedri Arman, Zhibin Guan, Gaurav Arya, and Sia Nemat-Nasser. "Polyurea With Hybrid Polymer Grafted Nanoparticles: A Parametric Study." In 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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Bischoff, E., D. A. Simon, S. A. Liberman, and R. S. Mauler. "Adsorption of ionic liquid onto halloysite nanotubes: Thermal and mechanical properties of heterophasic PE-PP copolymer nanocomposites." In PROCEEDINGS OF PPS-31: The 31st International Conference of the Polymer Processing Society – Conference Papers. AIP Publishing LLC, 2016. http://dx.doi.org/10.1063/1.4942300.

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Ohya, Yuichi, Koji Nagahama, Yuichiro Imai, Teppei Nakayama, and Tatsuro Ouchi. "Thermo-sensitive sol-gel transition and mechanical properties of poly(Depsipeptide-co-lactide)-g-PEG copolymers." In 2009 International Symposium on Micro-NanoMechatronics and Human Science (MHS). IEEE, 2009. http://dx.doi.org/10.1109/mhs.2009.5351825.

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Ramamurthy, Sridhar P., Lyle Steenson, and Zhong Hu. "Computer Simulation of Warpage Formation in Polymer Injection Molding of a Step Pad." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-13429.

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Warpage is one of the most common defects of a plastic product in the polymer injection molding process. It is attributed to the differential shrinkage after the part is ejected from the die cavity due to the nonlinear material property of the polymer, improper design of the cooling system, geometry of the part and the related process parameters. In this paper, the warpage formation of a plastic part, Step Pad of polypropylene copolymer, in the cooling stage of the polymer injection molding process was simulated by finite element analysis (FEA). A three-dimensional FEA model, taking into account the nonlinear material (polypropylene copolymer) properties, with a thermal-structural sequential coupled approach of higher computing efficiency was developed. The effects of mold closed time and layout of cooling system on the dimension and shape of the part were investigated. Industrial experiments for the different mold closed times (25s, 30s, 35s, 40s, 45s, 50s, and 55s) were conducted. The simulation results were compared with the experimental results. The approach is effective in predicting warpage in the polymer injection molding processes.
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