Combined Main-Chain/Side-Chain Liquid Crystalline Polymer with Main-Chain On the basis of “Jacketing” Effect and Side-Chain Containing Azobenzene Groups
Combined Main-Chain/Side-Chain Liquid Crystalline Polymer with Main-Chain On the basis of “Jacketing” Effect and Side-Chain Containing Azobenzene Groups
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DOI：
10.1021/ma200851v
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发表时间：
2011-09
期刊：
影响因子：
5.5
通讯作者：
He-Lou Xie;Shao-Jie Wang;G. Zhong;Yi-Xin Liu;Hailiang Zhang;E. Chen
中科院分区：
文献类型：
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作者：
He-Lou Xie;Shao-Jie Wang;G. Zhong;Yi-Xin Liu;Hailiang Zhang;E. Chen
将侧链上的“柔性间隔基”概念和侧基的“夹套”效应结合起来，合成了一种新型的基于自由基聚合的主链/侧链复合型液晶聚合物，即聚（2，5-双{[6-（4-甲氧基-4 ′-氧基-偶氮苯）己基]氧基羰基}苯乙烯）（表示为P1），每个重复单元具有两个偶氮苯基团。P1和相应的单体的化学结构进行了表征，使用各种技术与令人满意的分析数据。利用差示扫描量热法、偏光显微镜、一维和二维（1D和2D）广角X射线衍射研究了P1的相结构和相变。我们确定，P1可以形成一个层次有序的结构，在纳米和亚纳米的长度尺度上的双排序。最有可能的是，厚主链的P1获得的“护套”的中心刚性部分…
Combining the concept of “flexible spacer” which can bring liquid crystalline (LC) properties to the side-chains and the side-group “jacketing” effect which can result in main-chain with rod-like conformation, we have synthesized a new combined main-chain/side-chain LC polymer based on radical polymerization, poly(2,5-bis{[6-(4-methoxy-4′-oxy-azobenzene)hexyl]oxycarbonyl}styrene) (denoted as P1) with two azobenzene groups per repeating unit. The chemical structures of P1 and the corresponding monomer were characterized using various techniques with satisfactory analysis data. The phase structures and transitions of P1 were investigated using differential scanning calorimetry, polarized optical microscope, and one- and two-dimensional (1D and 2D) wide-angle X-ray diffraction. We identify that P1 can form a hierarchically ordered structure with double orderings on both the nanometer and subnanometer length scales. Most likely, the thick main-chains of P1 obtained by “jacketing” the central rigid portion of ...