Topic
Polymer blend
About: Polymer blend is a research topic. Over the lifetime, 18474 publications have been published within this topic receiving 437183 citations. The topic is also known as: polymer mixture & Polymerblend 或者 Polyblend.
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TL;DR: In this article, the positron annihilation with the core electrons of oxygen was detected with a sensitivity one order of magnitude higher than would be expected from the number density of the oxygen atoms in the polymer blends.
Abstract: Energy spectra of positron annihilation radiation were measured in polymer blends of polyethylene and ethylene vinyl acetate copolymer (E/VA) by means of the coincidence Doppler broadening technique. Positron annihilation with the core electrons of oxygen was appreciably increased by the addition of small amounts of E/VA to polyethylene and was detected with a sensitivity one order of magnitude higher than would be expected from the number density of the oxygen atoms in the polymer blends. This clearly shows that the positron is sensitively trapped by the polar acetate group of E/VA and demonstrates the usefulness of positrons as a sensitive chemical probe for polar structures in a nonpolar polymer matrix with high positron mobility. [S0163-1829(99)00941-8].
95 citations
01 Mar 2002
TL;DR: In this paper, a method for numerically sampling functional integrals in field theory models of polymer solutions and melts is presented, which relaxes the mean-field approximation in self-consistent field theories of equilibrium polymer phases.
Abstract: A method is presented for numerically sampling functional integrals in field theory models of polymer solutions and melts. The approach effectively relaxes the mean-field approximation in self-consistent field theories of equilibrium polymer phases. Viewed from another perspective, the method provides an alternative to conventional particle-based simulations of coarse-grained models of polymers. We demonstrate the technique by applying it to examine fluctuation effects on the order-disorder transition in symmetric diblock copolymer melts. Extensions to more complex polymer blends, copolymers, and solutions are outlined.
95 citations
TL;DR: In this paper, a theoretical model of the charge transport of photogenerated holes and electrons in a continuum model of a blend heterojunction organic solar cells is presented, based on the optical absorption in the active layer of the cell.
Abstract: In order to understand how to enhance the performance of blend heterojunction organic solar cells, we have developed a theoretical model that enables us to investigate the impact of a number of materials and device parameters on device performance. A full description of the charge transport of photogenerated holes and electrons in a continuum model of the blend is given. The injection of charges at anode and cathode is treated according to previous models. The input of our model is the optical absorption in the active layer of the cell, as calculated within previous optical models, and measured as well as estimated transport parameters. By applying the model to devices with the active layer consisting of an alternating copolymer of fluorene blended with a fullerene derivative, we conclude that the most limiting parameter in these devices is the low hole mobility in the blend. Electron-hole recombination is strongly suppressed compared to Langevin recombination, due to the donor-acceptor separation.
95 citations
TL;DR: In this article, the authors examined the distribution of CNTs in polymer blends based on their wetting coefficients and minimization of the interfacial energy, and found that to obtain a CNT-filled polymer composite with both high electrical conductivity and good mechanical properties, it is preferred that most CNT's distribute in one polymer phase, while the other polymer phase(s) remain neat.
Abstract: Four carbon nanotube (CNT)-filled polymer blends, i.e., CNT-filled polyethylene terephthalate (PET)/polyvinylidene fluoride, PET/nylon 6,6, PET/polypropylene, and PET/high-density polyethylene blends, have been injection-molded and characterized in terms of their microstructures, electrical conductivities, and mechanical properties. The distribution of CNTs in the polymer blends has been examined based on their wetting coefficients and minimization of the interfacial energy. The electrical conductivity and mechanical properties have been related to the cocontinuous polymer blends, the conductive path formed by CNTs, the CNT distribution, and the intrinsic properties of the constituent polymers. It is found that to obtain a CNT-filled polymer composite with both high electrical conductivity and good mechanical properties, it is preferred that most CNTs distribute in one polymer phase, while the other polymer phase(s) remain neat. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99: 477–488, 2006
95 citations
TL;DR: In this article, it was shown that only primary and not secondary hydroxyl groups formed interchain hydrogen bonds with the skeletal ether oxygen of PEO in binary blends of polymers bearing hydroxy groups.
Abstract: This article proposes that, in binary blends of PEO with polymers bearing hydroxyl groups, only primary and not secondary hydroxyl groups form interchain hydrogen bonds with the skeletal ether oxygen of PEO. To prove this, PVA, propylated PVA, and two hydroxypropylated PVA derivativesone with only secondary OH groups and the second with a mixture of primary and secondary OH groups, respectivelywere used as one component which was blended with PEO in solution. The above hypothesis was confirmed for the resulting blend films using optical microscopic observations, SALS, WAXD, FTIR, and thermodynamic analyses with DSC. Curiously, this idea of selective hydrogen bonding between primary OH groups and oxygen in PEO may also be a driving force for the inclusion of PEO by α-cyclodextrin (CD) as a host−guest system since the primary OH groups at the C-6 position lie at the narrow end of the α-CD.
95 citations