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	SYNTHESIS AND CHARACTERIZATION OF A LIQUID CRYSTALLINE TRIBLOCK COPOLYMER CONTAINING ETHOXYCARBONYLAZOBENZENE UNITS
	Deng Wei ; Wang Xiaogong
	2010-05-07 ; 2010-05-07
关键词	ABA triblock copolymer Atom transfer radical polymerization (ATRP) Ethoxycarbonylazobenzene Liquid crystalline polymer AB-BLOCK-COPOLYMERS DIBLOCK COPOLYMER SIDE-GROUPS ALIGNMENT MORPHOLOGY POLYMERS PATTERNS Polymer Science
中文摘要	The synthesis and characterization of a liquid-crystalline triblock copolymer containing ethoxycarbonylazobenzene units were described. The methacrylate containing ethoxycarbonylazobenzene functional group,6-(4-(4-ethoxycarbonylphenylazo)phenoxy)hexyl mathacrylate (C6ET), was prepared as the monomer. For the synthesis of the triblock copolymer, a macro-initiator was prepared by the reaction of PEO-2000 with an excessive amount of 2-bromoisobutyryl bromide catalyzed with triethylamine. The ABA triblock copolymer (PC6ET-PEO-PC6ET) was obtained by ATHP of C6ET with the macroinitiator. For comparison, a homopolymer PC6ET also was obtained by the atom transfer radical polymerization (ATRT) of C6ET. UV-Vis spectroscopy, FT-IR spectroscopy, H-1-NMR analysis an CPC measurements were used to characterize the structure and molecular weights of the products. Thermal analysis, optical microscopy and X-ray diffraction were used to characterize the LC phase types and phase-transition temperature. Results show that PC6ET is a liquid crystalline polymer with smectic phase. The clearing temperature of the homopolymer was 20 degrees C higher than the corresponding azo polymer with alkoxyl groups, which indicated the effect of substitutents on the liquid crystalline properties. The cleaning temperature of the ABA triblock copolymer PC6ET-PEO-PC6ET was slightly lower than that of the homopolymer. The phase transition temperatures of the homopolymer and block copolymer were determined to be Cr 70 s 153 i 151 s 58 g, and Cr 65 s 139 i 139 s 48 a (degrees C) respectively. The azobenzene-containing block copolymer could be used as a potential photoinduced self-assemble system.
语种	中文 ; 中文
出版者	SCIENCE CHINA PRESS ; BEIJING ; 16 DONGHUANGCHENGGEN NORTH ST, BEIJING 100717, PEOPLES R CHINA
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/17346]
专题	清华大学
推荐引用方式 GB/T 7714	Deng Wei,Wang Xiaogong. SYNTHESIS AND CHARACTERIZATION OF A LIQUID CRYSTALLINE TRIBLOCK COPOLYMER CONTAINING ETHOXYCARBONYLAZOBENZENE UNITS[J],2010, 2010.
APA	Deng Wei,&Wang Xiaogong.(2010).SYNTHESIS AND CHARACTERIZATION OF A LIQUID CRYSTALLINE TRIBLOCK COPOLYMER CONTAINING ETHOXYCARBONYLAZOBENZENE UNITS..
MLA	Deng Wei,et al."SYNTHESIS AND CHARACTERIZATION OF A LIQUID CRYSTALLINE TRIBLOCK COPOLYMER CONTAINING ETHOXYCARBONYLAZOBENZENE UNITS".(2010).

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