Influence of the terminal substituent of azobenzene on the liquid crystalline property of ABA triblock copolymers

摘要：

The influence of the terminal substituent of azobenzene on the liquid crystalline property of ABA triblock copolymers was studied. Three kinds of azobenzene-containing monomers with different terminal substituents were respectively used to synthesize ABA triblock copolymers (denoted as PMMAzo12-PEG13-PMMAzo12, PEMAzo14-PEG13-PEMAzo14, and PNMAzo14-PEG13-PNMAzo14) by atom transfer radical polymerization (ATRP). These copolymers were characterized with 1H NMR and GPC, and exhibited controlled molecular weights and narrow molecular weight distributions. Differential scanning calorimetry (DSC) and polarizing optical microscopy (POM) have shown that these copolymers have mesophases. PMMAzo12-PEG13-PMMAzo12 has a smectic mesophase and a nematic mesophase, while both PEMAzo14-PEG13-PEMAzo14 and PNMAzo14-PEG13-PNMAzo14 have a nematic mesophase. This demonstrates that the LC properties of these copolymers highly depend on the terminal substituent of azobenzene.

关键词： azobenzene ABA triblock copolymer liquid crystal atom transfer radical polymerization

作者: Xinde Tang Longcheng Gao Nianfeng Han

作者单位: Institute of New Materials, Shandong Jiaotong University, Jinan, Shandong 250023, China College of C College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China Institute of New Materials, Shandong Jiaotong University, Jinan, Shandong 250023, China

会议类型: 国际会议

会议名称: 2009 International Symposium on Liquid Crystal Science and Technology(2009国际液晶科技研讨会)

会议地点: 昆明

会议语种:英文

页码: 122-125

在线出版日期: 2009-08-02（万方平台首次上网日期，不代表论文的发表时间）