Synthesis of side group liquid crystal triblock copolymers with p-Methoxyazobenzene moieties by ATRP and their thermotropic phase behavior

Qiqun he; Hailiang zhang

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Synthesis of side group liquid crystal triblock copolymers with p-Methoxyazobenzene moieties by ATRP and their thermotropic phase behavior

Qiqun he,Hailiang zhang *

Xiangtan University

*Correspondence author

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Funding: 教育部博士点基金（No.SRFDP 20040530002）

Opened online:20 September 2006

Accepted by: none

Citation: Qiqun he,Hailiang zhang.Synthesis of side group liquid crystal triblock copolymers with p-Methoxyazobenzene moieties by ATRP and their thermotropic phase behavior[OL]. [20 September 2006] http://en.paper.edu.cn/en_releasepaper/content/8425

A series of novel LC-coil ABC triblock copolymers with narrow polydispersities was synthesized by ATRP. The LC coil triblocks were designed to have an LC conformation of poly[6-(4′-methoxy-4-oxy-azobenzene) hexyl methacrylate](PMMAZO)and the coil conformation of poly(ethylene oxide) (PEO)-b-poly(methyl methacrylate)(PMMA) segment. Their structures were confirmed by proton nuclear resonance (1H NMR) and gel permeation chromatograph (GPC). Their thermotropic phase behavior was investigated by differential scanning calorimetry (DSC) and POM. It was found that TS-N and TN-I of PMMAZO were slightly increased with the increasing of the mass ratio of liquid crystal block segments. PEO and PMMA block affected the liquid cystal behavior of PMMAZO. Meanwhile, PMMA and PMMAZO obviously influenced the crystal property of PEO segments, which was decreased as the increasing of molecular weight of PMMA and PMMAZO segments.

Keywords:Keywords: atom transfer radical polymerization (ATRP); triblock copolymer; liquid crystalline copolymers (LCP);ABC tri block copolymers; azobenzene

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