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THE LOCAL ENERGY APPROXIMATION AND THE PREDICTABILITY OF CHAIN CONFIGURATIONS IN POLYMER MELTS

机译:聚合物熔体的局部能量近似和链构象的可预测性

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摘要

The configurations of a series of short polar model molecules for poly(vinyl chloride), PVC, and poly(ethylene oxide), PEG, have been determined from extensive molecular dynamics simulations of the corresponding bulk melts. Their conformational and configurational properties are compared to those sampled for the same models by a pivot Monte Carlo procedure based on the assumption that chain configurations in the melt depend only on highly localized near-neighbor intramolecular interactions. The comparison proves favorable for all neutral and polar chains, with the exception of the realistic model leading to the gauche effect in PEG. Discrepancies in the latter case are related to the failure of the single-chain local energy approximation to account for the specific competition between intramolecular ''1 ... 5'' C-H ... O and intermolecular C-H ... O electrostatic interactions in the PEO bulk melts. (C) 1996 American Institute of Physics. [References: 50]
机译:聚氯乙烯,聚氯乙烯和聚环氧乙烷,PEG的一系列短极性模型分子的构型已从相应的本体熔体的广泛分子动力学模拟中确定。他们的构象和构型特性与通过相同的模型通过相同的模型进行了比较,该假设基于熔体中的链构型仅取决于高度局部的近邻分子内相互作用的假设。该比较证明对所有中性链和极性链均有利,但实际模型除外,导致PEG中的薄纱效应。后一种情况的差异与单链局部能量近似无法解释分子内“ 1 ... 5” CH ... O与分子间CH ... O静电相互作用之间的特定竞争有关。 PEO块熔化。 (C)1996年美国物理研究所。 [参考:50]

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