DYNAMIC STRUCTURE FACTOR IN A BIDISPERSE POLYMER MELT

被引:11
作者
WILSON, JD
LORING, RF
机构
[1] Department of Chemistry, Baker Laboratory, Cornell University, Ithaca
关键词
D O I
10.1063/1.469736
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We present calculations of the single-chain dynamic structure factor for a polymer melt composed of linear molecules of the same chemical identity but of two different chain lengths. The fluid is treated within a dynamical mean-held approach, in which each molecule is represented as a freely jointed chain moving among stochastic obstacles. The obstacles are of two types, each representing the obstruction of local conformational changes by one of the species present. The obstacle dynamics are determined self-consistently by equating the relaxation rate of an obstacle of a given type to the smallest conformational relaxation rate of the species that it represents. Calculation of the dynamic structure factor is mapped onto the solution of a random walk with dynamical disorder, in which a walker moves on a one-dimensional lattice with hopping rates that randomly fluctuate among three states. The relevant random walk problem is solved within the effective medium approximation, and the results are employed to examine the dependence of the dynamic structure factor on time, wave vector, chain lengths, and fluid composition. (C) 1995 American Institute of Physics.
引用
收藏
页码:1641 / 1649
页数:9
相关论文
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