Thermoreversible gelation in solutions of associative polymers. 1. Statics
Thermoreversible gelation in solutions of associative polymers. 1. Statics
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DOI：
10.1021/ma970616h
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发表时间：
1998-02-24
期刊：
影响因子：
5.5
通讯作者：
Rubinstein, M
中科院分区：
文献类型：
--
作者：
Semenov, AN;Rubinstein, M
本文提出了缔合聚合物溶液中可逆网络形成的平衡平均场理论。我们研究聚合物溶液中有许多关联基团，每链，并考虑这些基团的成对关联。这些系统的自由能的一个简单的解析表达式推导出，并示出与经典的凝胶化图片开发的Flory和Stockmayer是一致的。它示出的关联和形成的可逆网络总是伴随着相分离的趋势，甚至可能发生在边际溶剂条件下。平均场理论也被推广到考虑局部链内循环以及排除体积相互作用（部分溶胀的聚合物链）的影响。结果表明，相分离可能被排除的体积相互作用抑制。
An equilibrium mean-field theory for reversible network formation in solutions of associative polymers is presented. We study polymer solutions with many associating groups per chain and consider pairwise association of these groups. A simple analytical expression for the free energy of these systems is derived and is shown to be consistent with the classical gelation picture developed by Flory and Stockmayer. It is shown that association and formation of a reversible network is always accompanied by a tendency for phase separation which might occur even under marginal solvent conditions. The mean-field theory is also generalized to take into account the effect of local intrachain loops as well as excluded volume interactions (partial swelling of polymer chains). It is shown that phase separation might be suppressed by the excluded volume interactions.