Surface Stress Effects on the Bending Direction and Twisting Chirality of Lamellar Crystals of Chiral Polymer
Surface Stress Effects on the Bending Direction and Twisting Chirality of Lamellar Crystals of Chiral Polymer
复制标题
表面应力对手性聚合物层状晶体弯曲方向和扭曲手性的影响
DOI：
10.1021/ma100920u
复制
发表时间：
2010-07-13
期刊：
影响因子：
5.5
通讯作者：
Chen, Guo-Qiang
中科院分区：
文献类型：
--
作者：
Ye, Hai-Mu;Wang, Jian-Shan;Chen, Guo-Qiang
在各种相互作用和合成材料的高度有序组装结构中手性的表达仍然是一个谜。尽管已知表面应力在聚合物片层中广泛存在，但它们如何影响扭曲手性仍然是一个未解决的问题。在此我们报道了微生物聚（R - 3 - 羟基丁酸酯）共聚物的片层扭曲手性通过共聚或共混从左旋转变为右旋，而分子手性和晶核中的结构不变。我们用基于表面弹性理论的连续介质模型解释了观察到的扭曲手性的反转和复杂的片层曲率。定量模拟表明，各向异性表面应力的分布和片层的表面弹性性质显著影响片层扭曲的形态手性。对于不同的手性聚合物，相同的弯曲方向可能与相反的扭曲手性相关。
Expression of chirality in the highly ordered assembly structures of various types of natural and synthetic materials is still a mystery. Although surface stresses have been known to widely exist in polymer lamellae, how they affect the twisting chirality is yet an unsolved issue. Here we report inversion of the lamellar twisting chirality of microbial poly(R-3-hydroxybutyrate) copolymers from left-handed to right-handed via copolymerization or blending, with the molecular chirality and the structures in the crystalline core unchanged. We interpret the observed inversion of twisting chirality and the complicated lamellar curvature with a continuum model based on surface elasticity theory. Quantitative simulations reveal that the distribution of the anisotropic surface stresses and the surface elasticity property of the lamellae significantly affect the morphological chirality of lamellar twisting. For different chiral polymers, the same bending direction may correlate to the opposite twisting chirality.