Effect of the terminal substituent of azobenzene on the properties of   ABA triblock copolymers via atom transfer radical polymerization

doi:10.1002/pola.22263

CORC > 北京大学 > 化学与分子工程学院

	Effect of the terminal substituent of azobenzene on the properties of ABA triblock copolymers via atom transfer radical polymerization
	Tang, Xinde ; Gao, Longcheng ; Fan, Xinghe ; Zhou, Qifeng
刊名	journal of polymer science part a polymer chemistry
	2007
关键词	ABA triblock copolymers atom transfer radical polymerization (ATRP) azo polymers azobenzene block copolymers liquid-crystalline polymers (LCP) liquid-crystalline property photoresponsive property terminal substituents LIQUID-CRYSTALLINE POLYMERS LIVING CATIONIC POLYMERIZATION AMPHIPHILIC DIBLOCK COPOLYMERS SIDE-CHAIN POLYMERS BLOCK-COPOLYMERS MOLECULAR-WEIGHT VINYL ETHER BEHAVIOR MOIETIES PHASE
DOI	10.1002/pola.22263
英文摘要	The effect of the terminal substituent of azobenzene on the properties of ABA triblock copolymers was investigated. For this study, three kinds of azobenzene-containing monomers with different terminal substituents-6-[4-(4-methoxyphenylazo)phenoxy] hexyl methacrylate, 6-[4-(4-ethoxyphenylazo)phenoxy]hexyl methacrylate, and 6-[4-(4nitrophenylazo)phenoxy]hexyl methacrylate-were used to synthesize ABA triblock copolymers PMMAzo(25)-PEG(13)-PMMAzo(25)/PMMAzo(12)-PEG(13)-PMMAzo(12), PEMAzo(14)-PEG(13)-PEMAzo(14) and]PNMAzo(14)-]PEG(13)-PNMAzo(14), respectively, by atom transfer radical polymerization (PMMAzo is poly(6-[4-(4-methoxyphenylazo)phenoxy]hexyl methacrylate), PEMAzo is poly[6-[4-(4-ethoxyphenylazo)phenoxy]hexyl methacrylate), and PNMAzo is poly{6-[4-(4-nitrophenylazo)phenoxy]hexyl methacrylatel). These copolymers were characterized with H-1 NMR spectroscopy and gel permeation chromatography and exhibited controlled molecular weights and narrow molecular weight distributions. Differential scanning calorimetry and polarizing optical microscopy showed that these copolymers had mesophases. PMMAo(25)-PEG(13)-PMALAzo(25) and PMAIAzo(12)-PEG(13)-PMMAzo(12) had a smectic mesophase and a nematic mesophase, whereas both PEMAzo(14)-PEG(13)-PEMAzo(14) and PNMAzo(14) -PEG(13)-PNMAzo(14) had a nematic mesophase. This demonstrated that the liquid-crystalline properties of these copolymers highly depended on the terminal substituent of azobenzene. The photoresponsive behavior of these copolymers was also investigated in tetrahydrofuran solutions, and the influence of the terminal substituents attached to azobenzene was studied. (c) 2007 Wiley Periodicals, Inc.; Polymer Science; SCI(E); EI; 0; ARTICLE; 22; 5190-5198; 45
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/252654]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Tang, Xinde,Gao, Longcheng,Fan, Xinghe,et al. Effect of the terminal substituent of azobenzene on the properties of ABA triblock copolymers via atom transfer radical polymerization[J]. journal of polymer science part a polymer chemistry,2007.
APA	Tang, Xinde,Gao, Longcheng,Fan, Xinghe,&Zhou, Qifeng.(2007).Effect of the terminal substituent of azobenzene on the properties of ABA triblock copolymers via atom transfer radical polymerization.journal of polymer science part a polymer chemistry.
MLA	Tang, Xinde,et al."Effect of the terminal substituent of azobenzene on the properties of ABA triblock copolymers via atom transfer radical polymerization".journal of polymer science part a polymer chemistry (2007).