Journal of Research Updates in Polymer Science最新文献_第9页

Synthesis by ATRP of Polystyrene-b-Poly(4-vinylpyridine) and Characterization by Inverse Gas Chromatography 聚苯乙烯-b-聚(4-乙烯基吡啶)的ATRP合成及反相色谱表征

Journal of Research Updates in Polymer Science Pub Date : 2017-10-04 DOI: 10.6000/1929-5995.2017.06.03.2

M. Rajab, T. Hamieh, A. Airoudj, K. Mougin, Kamal Hariri, W. Rammal, Houssein Mortada, M. Akil, A. Kassas, J. Toufaily

{"title":"Synthesis by ATRP of Polystyrene-b-Poly(4-vinylpyridine) and Characterization by Inverse Gas Chromatography","authors":"M. Rajab, T. Hamieh, A. Airoudj, K. Mougin, Kamal Hariri, W. Rammal, Houssein Mortada, M. Akil, A. Kassas, J. Toufaily","doi":"10.6000/1929-5995.2017.06.03.2","DOIUrl":"https://doi.org/10.6000/1929-5995.2017.06.03.2","url":null,"abstract":"A linear diblock copolymer [Polystyrene-b-Poly(4-vinyl-pyridine)] (PS-b-P4VP) was successfully prepared through Atom Transfer Radical Polymerization (ATRP). This synthesis is performed in two successive steps: using the (1-bromoethyl) benzene as initiatorand and Hexamethyl tris [2(dimethylamino)ethyl] amine as ligands in a protic solvent. The first step of the synthesis allows the realization of block polystyrene having a terminal function; however, Bromine (Br) permits the grafting of the second successive block P4VP. RMN -1H demonstrates that the P4VP block has been grafted onto the PS block. The molecular weight of PS-b-P4VP is determined by size exclusion chromatography, and its thermal stability is examined by TGA. The surface and the thermodynamic properties of this copolymer are studied by inverse gas chromatography (IGC). The new Hamieh Model shows that the synthesized copolymer PS-P4VP has an amphoteric behavior with rather very basic character that is six times stronger than acidic character (in Lewis terms), reflected the presence of acidic and basic groups in the structure of the PS-P4VP copolymer, more particularly the presence of benzenic, methyl and vinylpyridine groups.","PeriodicalId":16998,"journal":{"name":"Journal of Research Updates in Polymer Science","volume":"51 1","pages":"76-89"},"PeriodicalIF":0.0,"publicationDate":"2017-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89480386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Color and Fastness Properties of Woven Stretchable Fabrics 机织可拉伸织物的色牢度性能

Journal of Research Updates in Polymer Science Pub Date : 2017-06-16 DOI: 10.6000/1929-5995.2017.06.02.1

N. Nassif

引用次数: 0

Peculiarities of The Orientational State of Liquid-Crystal Completely Aromatic Thermotropic Copolymer 液晶全芳香族热致共聚物取向态的特性

Journal of Research Updates in Polymer Science Pub Date : 2017-06-16 DOI: 10.6000/1929-5995.2017.06.02.2

V. Ryzhov

引用次数: 1

Morphological, Thermal and Electrical Properties of (PEO/PVP)/ Au Nanocomposite Before and After Gamma-Irradiation γ辐照前后(PEO/PVP)/ Au纳米复合材料的形态、热学和电学性能

Journal of Research Updates in Polymer Science Pub Date : 2017-06-16 DOI: 10.6000/1929-5995.2017.06.02.3

E. M. Abdelrazek, A. Abdelghany, S. I. Badr, M. Morsi

引用次数: 22

Anisotropy Enhanced Phase Separation in Polymer Dispersed Liquid Crystals 各向异性增强聚合物分散液晶的相分离

Journal of Research Updates in Polymer Science Pub Date : 2017-06-16 DOI: 10.6000/1929-5995.2017.06.02.4

F. Benmouna, M. Benmouna

{"title":"Anisotropy Enhanced Phase Separation in Polymer Dispersed Liquid Crystals","authors":"F. Benmouna, M. Benmouna","doi":"10.6000/1929-5995.2017.06.02.4","DOIUrl":"https://doi.org/10.6000/1929-5995.2017.06.02.4","url":null,"abstract":"Phase separated blends of polymers and low molecular weight liquid crystals, commonly known as polymer dispersed liquid crystals in short PDLCs, are investigated. These materials offer a realm of applications in modern technologies, including sensors, commutable windows, display devices and telecommunication systems. A particular attention is given to the effects of anisotropy of the liquid crystal on the phase behavior under equilibrium and non equilibrium conditions. The theoretical formalism used is based on the lattice model of isotropic mixing, combined with standards theories of nematic and smectic-A orders. Considering the equilibrium phase behavior, we find that the nematic order enhances the polymer / solvent phase separation, and that the osmotic pressure shows substantial changes for relatively small polymer volume fractions. We find that the anisotropy enhanced phase separation is more pronounced for a smectic-A liquid crystal, and the miscibility gap is widened. The kinetics of swelling by nematic LCs is examined using a linear solvent diffusion process, with a rate of swelling directly related to the derivative of the osmotic pressure. An abrupt swelling / de-swelling transition is found, due to overwhelming effects of the anisotropic interaction beyond the threshold LC concentration. Anisotropy enhanced phase separation is also investigated in the method of synthesis based on the polymerization induced phase separation mechanism. We find that the kinetics of separation during early stages of polymerization is faster, due to the anisotropic interaction of the low molecular weight solvent. The kinetics speed up is favored by the long range viscous flow effects due to hydrodynamic interactions. A limited selection of experimental data in the literature is chosen to validate some theoretical predictions obtained from the present formalisms.","PeriodicalId":16998,"journal":{"name":"Journal of Research Updates in Polymer Science","volume":"37 1","pages":"55-67"},"PeriodicalIF":0.0,"publicationDate":"2017-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85874693","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Manufacturing and Characterization of High Impact Polystyrene (HIPS) Reinforced with Treated Sugarcane Bagasse 处理蔗渣增强高冲击聚苯乙烯(HIPS)的制备及性能研究

Journal of Research Updates in Polymer Science Pub Date : 2017-04-06 DOI: 10.6000/1929-5995.2017.06.01.1

K. Benini, H. Voorwald, M. Cioffi

引用次数: 2

Featuring High Impact Polystyrene Composites Strengthened with Green Coconut Fiber Developed for Automotive Industry Application 采用绿色椰子纤维增强的高冲击聚苯乙烯复合材料，开发用于汽车工业

Journal of Research Updates in Polymer Science Pub Date : 2017-04-06 DOI: 10.6000/1929-5995.2017.06.01.3

G. B. Pereira, Glayce Cassaro Pereira, MÃ¡rcio Lima, B. J. S. Jesus, E. Silva, K. Benini, C. F. Bandeira, S. R. Montoro

{"title":"Featuring High Impact Polystyrene Composites Strengthened with Green Coconut Fiber Developed for Automotive Industry Application","authors":"G. B. Pereira, Glayce Cassaro Pereira, MÃ¡rcio Lima, B. J. S. Jesus, E. Silva, K. Benini, C. F. Bandeira, S. R. Montoro","doi":"10.6000/1929-5995.2017.06.01.3","DOIUrl":"https://doi.org/10.6000/1929-5995.2017.06.01.3","url":null,"abstract":"Studies focused on generating products able to reduce environmental impact have been put in place, and those aiming at finding polymeric composites strengthened with natural fibers stand out among them. A composite was strengthened with coconut fibers in the present study, since the generation of coconut residues has increased in Brazil due to coconut water industrialization. The aim of the present study is to process a high impact polystyrene (HIPS) composite strengthened with coconut fiber and to verify its possible application in the automotive industry. Strengthened samples were prepared using coconut fibers in the proportions 10, 20 and 30% fiber to develop such HIPS composite. Analyses were performed in order to set the density, Shore A hardness and impact resistance of the processed composites. It was found that the density and Shore A hardness results in the HIPS did not change due to the addition of coconut fibers. However, it was observed that the impact resistance was reduced because of it. It was noteworthy that the decreased impact resistance did not preclude the use of the HIPS/coconut fiber composite, since it showed that such material can be used in parts free from strong mechanical stress such as those inside the automobiles. The use of coir HIPS also aimed at reducing costs related to the polymerâ€™s consumption and at reusing the waste (coconut husk) from coconut water industries.","PeriodicalId":16998,"journal":{"name":"Journal of Research Updates in Polymer Science","volume":"14 1","pages":"17-20"},"PeriodicalIF":0.0,"publicationDate":"2017-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88088374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Analysis of stress concentration factor for tensile characteristics of syntactic foam using finite element method 用有限元法分析复合泡沫材料拉伸特性的应力集中系数

Journal of Research Updates in Polymer Science Pub Date : 2017-04-06 DOI: 10.6000/1929-5995.2017.06.01.4

Z. Salleh, Mainul Islam, J. Epaarachchi

{"title":"Analysis of stress concentration factor for tensile characteristics of syntactic foam using finite element method","authors":"Z. Salleh, Mainul Islam, J. Epaarachchi","doi":"10.6000/1929-5995.2017.06.01.4","DOIUrl":"https://doi.org/10.6000/1929-5995.2017.06.01.4","url":null,"abstract":"This paper presented the stress concentration factor (SCF) around the half circular edge of tensile specimens \u0000made of syntactic foam using finite element software Strand7 software. The study is a preliminary effort, which investigates the effect of variations of crack geometry on the stress concentration factor on a tensile specimen subjected to a constant, uniform, uniaxial tensile load. The material property is graded for varying Young’s Modulus and Poisson’s Ratio with different composition of glass microballoons. Finally, a uniform pressure is applied at the top and the model is constrained with symmetric boundary conditions at the left and bottom. As the result, these numerical results for both SCF experimental and simulation model are compared to those obtained from analytic fracture mechanics procedures and are found to be varied. In addition, the SCF is sensitive to the modulus of elasticity, particularly for lower composition weight percentage (wt.%), while it is also varied with the different weight percentage (wt.%) of glass microballoons, which is led by 2 wt.% specimen.","PeriodicalId":16998,"journal":{"name":"Journal of Research Updates in Polymer Science","volume":"10 1","pages":"21-32"},"PeriodicalIF":0.0,"publicationDate":"2017-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79610125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Degradability of Epoxy/Sisal Fiber Composites via Simulated Soil 环氧树脂/剑麻纤维复合材料在模拟土壤中的降解性

Journal of Research Updates in Polymer Science Pub Date : 2017-04-06 DOI: 10.6000/1929-5995.2017.06.01.2

C. F. Bandeira, S. R. Montoro, S. T. Faria, P.R.S. Moreira, A. Pereira, L. Oliveira, A. Milanese

引用次数: 1

Optimizing Activators Regenerated by Electron Transfer for Atom Transfer Radical Polymerization of Methyl Methacrylate Initiated by Ethyl 2-bromopropionate 2-溴丙酸乙酯引发甲基丙烯酸甲酯原子转移自由基聚合电子转移再生活化剂的优化

Journal of Research Updates in Polymer Science Pub Date : 2017-01-23 DOI: 10.6000/1929-5995.2016.05.04.3

Mingsen Chen, H. Zhou, Xiaofang Li, Li Zhou, Faai Zhang

{"title":"Optimizing Activators Regenerated by Electron Transfer for Atom Transfer Radical Polymerization of Methyl Methacrylate Initiated by Ethyl 2-bromopropionate","authors":"Mingsen Chen, H. Zhou, Xiaofang Li, Li Zhou, Faai Zhang","doi":"10.6000/1929-5995.2016.05.04.3","DOIUrl":"https://doi.org/10.6000/1929-5995.2016.05.04.3","url":null,"abstract":"In this study, we used ethyl 2-bromopropionate (EBrP) as an initiator of activators regenerated by electron transfer for atom transfer radical polymerization (ARGET ATRP) of methyl methacrylate (MMA). We investigated in detail the effect on polymerization of different kinds of reducing agents and ligands, the amounts of the reducing agent and catalyst, and reaction temperature. We determined the molecular weight and dispersity of the polymers by gel permeation chromatography (GPC). The results reveal glucose to be the best reducing agent for this system. The monomer conversion increased with increases in the reaction temperature and in the feeding amounts of the reducing agent and catalyst. The optimum amount of the reducing agent and minimal amount of catalyst required depend on the particular system. For example, we polymerized MMA with 200 ppm of catalyst and 15-fold of glucose/CuCl 2 resulting in a PMMA with high M n ( M n,GPC = 48 700, M n,theo = 48 500) and low dispersity (1.27). The first-order kinetics show that the molecular weights increased linearly with the monomer conversion and are consistent with the theoretical values, the chain extension reaction and end group analysis results also demonstrate that the characteristics of polymerization process belong to a typical â€œlivingâ€/controlled radical polymerization. Moreover, 1 H-NMR analysis results indicate the stereoregularity of the polymer is given priority over syndiotactic architecture and the effect of the type of ligand on the stereoregularity is very slight.","PeriodicalId":16998,"journal":{"name":"Journal of Research Updates in Polymer Science","volume":"10 1","pages":"149-157"},"PeriodicalIF":0.0,"publicationDate":"2017-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87556240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0