薄膜高分子结晶形态及其生长机理研究进展

Research Progress of Crystal Morphology and Growth Mechanism in Polymer Thinfilms

由于高分子薄膜和超薄膜的空间效应和界面效应显著,其结晶行为与本体相比具有很大的差别。本文综述了近年来关于高分子在薄膜和超薄膜中特殊结晶行为的研究进展,重点介绍了晶体取向与薄膜厚度的关系。随着膜厚的减小,界面吸附作用对侧立片晶的抑制作用增强,导致晶体取向由侧立转变为平躺。超薄膜中晶体生长受扩散机理控制,其形态不稳定,变为树枝状晶体。在超薄膜中晶体的生长速率随着膜厚的减小而减小,当膜厚小于片晶厚度时,减小的趋势变缓。

Crystallization in polymer thin and ultra-thin films deviates greatly from its behaviors in bulk states due to the stronger geometrical confinement and interfacial effect.The recent work related to the special crystallization in polymer thin and ultra-thin films are reviewed in this paper,the relation of lamellar crystal orientations and film thickness is focused.As the film thickness decreases,the restriction of interfacial attractive interactions favors more on the flat-on lamellar crystals than the edge-...