ROLE OF SLIDING DIFFUSION AND MOLECUAR WEIGHT OF POLYMER CHAINS IN POLYMER CRYSTALLIZATION AND LIQUIDCRYSTALLIZATION

聚合物的结晶速率与分子量(M)有很大的关系，但结晶机理一直是高分子科学中未解决的重要问题。我们在这项研究中解决了这个问题。我们的答案是，横向生长速率(V)的M依赖主要是由熔体和晶体之间界面上的链式滑动扩散过程控制的。从观察结果可以直接得到答案，即V对M的依赖很大程度上取决于晶体的形态、有序或无序，这不能用传统的说法来解释，即它是由熔体内链分子的自扩散控制的。

nown that polymer crystallization rate strongly depends on molecular weight (M), but its mechanism has bccn remained as an ained as an important unsolved problem in polymer science. We solved the problem in this study. Our answcr is that the M dependence of the lateral growth rate (V) is mainly controlled by the chain sliding diffusion process on the inrerface between the melt and the crystals. The answer was directly obtained from the observed result that the M dependence of V strongly depends on the crystal form, order or disorder, which can not be cxplaincd by the conventional proposal that it is controlled by self diffusion of chain molecules within the melt.