基于螺旋聚乙炔的可切换手性柱状相：受挫链堆积与双向形状驱动器

Helical Polyacetylene-Based Switchable Chiral Columnar Phases: Frustrated Chain Packing and Two-Way Shape Actuator.

作者信息

Wang Jun, Liu Xiao-Qing, Ren Xiang-Kui, Zhang Ben, Yang Shuang, Cao Yu, Liu Feng, Lotz Bernard, Chen Er-Qiang

机构信息

Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, College of Chemistry, Peking University, Beijing, 100871, P. R. China.

School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, P. R. China.

出版信息

Chem Asian J. 2016 Sep 6;11(17):2387-91. doi: 10.1002/asia.201600879. Epub 2016 Aug 17.

DOI:10.1002/asia.201600879

PMID:27448019

Abstract

Chiral columns formed by a helical cis-polyphenylacetylene (PPA) derivative P1 are reversibly switched during a phase transition between two chiral columnar phases: the frustrated Φh (3D-SL) phase containing four chains at low temperature and a hexagonal columnar phase Φh at high temperature, accompanied by a simultaneous conformational change. The helix-helix transition along the PPA backbone during the Φh (3D-SL) -Φh transition makes the uniaxially oriented P1 capable of reversibly and reproducibly elongating (132 %) upon heating and contracting upon cooling, exhibiting the behavior of a two-way shape actuator.

摘要

由螺旋状顺式聚苯乙炔（PPA）衍生物P1形成的手性柱在两个手性柱状相之间的相变过程中可逆切换：低温下包含四条链的受挫Φh（3D-SL）相和高温下的六方柱状相Φh，同时伴随着构象变化。在Φh（3D-SL）-Φh转变过程中，沿着PPA主链的螺旋-螺旋转变使得单轴取向的P1能够在加热时可逆且可重复地伸长（132%），冷却时收缩，表现出双向形状致动器的行为。