Influence of alkoxy tail length on the self-organization of hairy-rod polymers based on mesogen-jacketed liquid crystalline polymers
作者:Sheng Chen、Changkai Jie、Helou Xie、Hailiang Zhang
DOI:10.1002/pola.26194
日期:2012.10.1
increasing length of alkoxy tails, the P‐OCm (m = 4, 6, 8) presented a re‐entrant isotropic phase above Tg and a liquid crystalline phase at higher temperature. Third, the P‐OCm (m = 10, 12, 14, 16, 18) exhibited an unusual re‐entrant isotropic phase which was separating SmA (in low temperature) and columnar phases (in high temperature). It was the first time that mesogen‐jacketed liquid crystalline polymers
一系列有毛杆聚合物,聚2,5-双[(4-烷氧基苯基)氧羰基]苯乙烯}(P-OC m,m = 1,2,4,4,6,8,10,12,14,16 (和18)设计并通过自由基聚合成功合成。单体的化学结构通过元素分析,1 H NMR和13 C NMR确认。用1对聚合物进行分子表征1 H NMR和凝胶渗透色谱。通过包括差示扫描量热法,广角X射线衍射,偏振光学显微镜和流变学测量在内的各种技术的结合,研究了聚合物的相结构和转变。实验结果揭示,P-OC自组装行为米与在增加改变米。首先,P-OC m(m = 1,2)仅显示出高于T g的稳定液晶相。其次,随着烷氧基尾巴长度的增加,P-OC m(m = 4、6、8)在T g以上呈现出折返的各向同性相在较高温度下为液晶相。第三,P-OC m(m = 10、12、14、16、18)表现出不寻常的折返各向同性相,该相将SmA(在低温下)和柱状相(在高温下)分开。由于