引用本文:
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
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
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
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 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.
English
Effect of spacer length on the liquid crystalline property of azobenzene-containing ABA-type triblock copolymers via ATRP
Abstract:
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.
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