ARCHITECTURE-CONTROLLED INTERACTION BETWEEN ASSOCIATING POLYMERS

被引:29
作者
BALJONHAAKMAN, ARC
WITTEN, TA
机构
[1] The James Franck Institute, The University of Chicago, Chicago, Illinois 60637
关键词
D O I
10.1021/ma00037a028
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
We have developed a Monte Carlo computer simulation to study associating polymer interactions. In our model we treat the associations as geometrical constraints. Each polymer chain contains two "stickers". The chains are treated as lattice self-avoiding random walks. Each sticker is constrained to be adjacent to one other sticker, but the stickers are free to exchange partners. This freedom to exchange results in an attraction between the chain's, as anticipated by Cates and Witten (Macromolecules 1986, 19, 732). We find that in equilibrium the mutual excluded volume of two such chains passes from repulsive to attractive when the ratio of the sticker distance to the chain length is 0.776 +/- 0.012 for symmetrically placed stickers and 0.829 +/- 0.009 for maximally asymmetrically placed stickers. These results are independent of the chain length (molecular weights 34, 66, and 130): they should apply to real polymers subject to these topological constraints in any good solvent at sufficiently high molecular weight. At these critical placements, the second virial coefficient vanishes and a dilute solution of two sticker chains with doublet sticker interaction is in its theta-state.
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收藏
页码:2969 / 2976
页数:8
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