Theory of weak supercrystallinity in melts of two-component copolymers of complicated chemical structure. Fluctuation effects

Polymer Science U.s.s.r. Pub Date : 1991-01-01 Epub Date: 2003-06-11 DOI:10.1016/0032-3950(91)90172-M

A.V. Dobrynin, I.Ya. Yerukhimovich

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引用次数: 3

Abstract

The influence of fluctuation effects on supercrystallization (formation of domain structure) in melts of two-component copolymers of complicated chemical structure was studied by a refined variation method, generalizing the results of the Brazovskii theory of weak crystallization to the case of arbitrary angular dependence of node functions. By means of numerical calculations, the phase diagrams of transitions into the supercrystalline state were constructed and analysed in a space of parameters describing the chemical structure and temperature of the copolymer, for the following types of copolymeric systems: asymmetrical triblock and trigraft copolymers, star copolymers (A_n)_k(B_m)_k, as well as polyblock and polygraft copolymers. By taking account of the fluctuation effects, qualitative agreement is obtained with the results of Fredrickson and Helfand on changes in the structure of the transition sequence previously found by the authors using the mean field approximation.

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复杂化学结构双组分共聚物熔体弱超结晶度理论。波动的影响

采用精细变分法研究了波动效应对复杂化学结构双组分共聚物熔体超结晶(域结构形成)的影响，将Brazovskii弱结晶理论的结果推广到节点函数角依赖任意情况下。通过数值计算，在描述共聚物化学结构和温度的参数空间中，对不对称三嵌段和三嵌段共聚物、星型共聚物(An)k(Bm)k以及聚嵌段和接枝共聚物的过渡相图进行了构造和分析。在考虑波动效应的情况下，与Fredrickson和Helfand先前用平均场近似得到的关于过渡序列结构变化的结果在定性上一致。

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Polymer Science U.s.s.r.

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