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

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

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  • Trans Tech Publications Ltd
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 as n increases. PA0C-PEG-PA0C 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.

spacer lengthliquid crystalazobenzeneatom transfer radical polymerization

Xinde Tang、Longcheng Gao、Nianfeng Han

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Institute of New Materials, Shandong Jiaotong University, Jinan, Shandong 250023, China College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China

College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China

Institute of New Materials, Shandong Jiaotong University, Jinan, Shandong 250023, China

2010

10.4028/www.scientific.net/KEM.428-429.67

Key engineering materials

Key engineering materials

ISSN：1013-9826
年,卷(期)：2010.428/429
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