Citation: Xin De Tang, Long Cheng Gao, Xing He Fan, Qi Feng Zhou. Effect of spacer length on the liquid crystalline property of azobenzene-containing ABA-type triblock copolymers via ATRP[J]. Chinese Chemical Letters, ;2007, 18(9): 1129-1132. doi: 10.1016/j.cclet.2007.06.016 shu

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

a Institute of New Materials, Shandong Jiaotong University, Ji'nan 250023, China;
b Department of Polymer Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China

Received Date: 27 February 2007

Fund Project: This work was supported by the National Natural Science Foundation of China (No.20134020),the Science Research Fund of the Chinese Ministry of Education (No.104005),and the Science Research Fund of Shandong Provincial Education Department of China (No.J05D11).

The effect of flexible spacer length on the liquid crystalline property of ABA-type triblock copolymers containing azobenzene groups was investigated. For the study, the monomers, n-[4-(4-ethoxyphenylazo) phenoxy]alkyl 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 with increasing n, PA0C-PEG-PA0C has no mesophase, while both PA2C-PEG-PA2C and PA6C-PEGPA6C have a nematic mesophase. These differences derive from the length of spacer groups between the polymer backbone and side-chain LC monomers.
- Spacer group,
- Liquid crystalline property,
- Azobenzene,
- Triblock copolymer,
- Atom transfer radical polymerization (ATRP)
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