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

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  • Trans Tech Publications Ltd
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 PMMAzo_(12)-PEG_(13)-PMMAzo_(12), PEMAzo_(14)-PEG_(13)-PEMAzo_(14), and PNMAZO_(14)-PEG_(13)-PNMAZO_(14)) 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. PMMAzo_(12)-PEG_(13)-PMMAzon has a smectic mesophase and a nematic mesophase, while both PEMAzo_(14)-PEG_(13)-PEMAzo_(14) and PNMAzo_(14)-PEG_(13)-PNMAzo_(14) have a nematic mesophase. This demonstrates that the LC properties of these copolymers highly depend on the terminal substituent of azobenzene.

azobenzeneABA triblock copolymerliquid crystalatom 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.428-429.122

Key engineering materials

Key engineering materials

ISSN：1013-9826
年,卷(期)：2010.428/429
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