Effect of spacer length on the liquid crystalline property of azobenzene-containing ABA-type triblock copolymers via ATRP

摘要：

The effect of flexible spacer length on the liquid crystalline property ofABA-type triblock copolymers containing azobenzene groups was investigated. For the study, the monomers, n-4-(4-ethoxyphenylazo)phenoxyalkyl methacrylates with varying methylene groups (n = 0, 2, 6)were used to synthesize a series of azobenzene-containing amphiphilic triblock copolymers PAnC-PEG-PAnC by atom transfer radical polymerization (ATRP). Differential scanning calorimetry (DSC), polarizing optical microscopy (POM), and one-dimensional X-ray diffraction ( 1D WAXD) have shown that the glass transition temperatures of these copolymers decreased as n increases. PAOC-PEG-PAOC has no mesophase, while both PA2C-PEG-PA2C and PA6C-PEG-PA6C have a nematic mesophase. These differences derive of the length of spacer groups between the polymer main chain and side chain.

关键词： spacer length liquid crystal azobenzene 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: 67-70

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）