Surface Stress Effects on the Bending Direction and Twisting Chirality of Lamellar Crystals of Chiral Polymer
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- 作者：Hai-Mu Ye ; Jian-Shan Wang ; Shuo Tang ; Jun Xu ; Xi-Qiao Feng ; Bao-Hua Guo ; Xu-Ming Xie ; Jian-Jun Zhou ; Lin Li ; Qiong Wu ; Guo-Qiang Chen
- 刊名：Macromolecules
- 出版年：2010
- 出版时间：July 13, 2010
- 年：2010
- 卷：43
- 期：13
- 页码：5762-5770
- 全文大小：1028K
- 年卷期：v.43,no.13(July 13, 2010)
- ISSN：1520-5835
文摘
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.