溶致凝聚过程中分子链构象的演变

Transitions of Chain's Conformation in the Lytropic Condensation of Macromolecules

详细讨论了稀溶液、亚浓溶液、浓溶液和极浓溶液中分子链构象的演变,考察了在溶致凝聚过程中分子链的链间相互作用、关联作用和分子链尺寸的变化规律,给出了排除体积的严格定义,引入热关联效应、长程关联效应和全高斯链浓度等概念。指出在不同浓度溶液中,分子链在不同尺度上构象状态不同;在从孤立单链态(良溶液中)向多链聚集态的溶致凝聚过程中,单链的尺寸一直在收缩,由Flory尺寸RF缩小至无扰尺寸R0。这是大分子凝聚过程的一个特点。

In this work the macromolecular chain＇s conformations in dilute, semidilute,concentrated and extra concentrated polymer solutions were discussed respectively, at the same time the interactions between macromolecules, the complex correlative effects and the changes of macromolecular sizes were explained in detail, and the definition of excluded volume and several concepts, thermic correlation, long-range correlation and full Gaussian concentration were introduced. It is indicated that the conformations at different chain＇s size ranges are different in the solutions of different concentrations, and that the single chain＇s size happened contraction in lytrooic condensation process of macromolecules, from Flory size RF to unperturbed chain dimension Ro.This is a specialty of lytrooic condensation of macromolecules.