Synthesis and mesophase behaviors of 2,5-disubstituted styrene-based   random copolymers: Effect of difference in side-group length on liquid   crystallinity

doi:10.1016/j.polymer.2007.05.026

CORC > 北京大学 > 化学与分子工程学院

	Synthesis and mesophase behaviors of 2,5-disubstituted styrene-based random copolymers: Effect of difference in side-group length on liquid crystallinity
	Tang, Hui ; Cao, Hong-Qing ; Zhu, Zhi-Guo ; Wan, Xin-Hua ; Chen, Xiao-Fang ; Zhou, Qi-Feng
刊名	polymer
	2007
关键词	liquid crystallinity random copolymerization mesophase formation ELECTRON-ACCEPTING (4-NITROBENZYLIDENE)ANILINE BUTYL VINYL ETHER HETEROCYCLOALKANEDIYL GROUPS THERMAL-PROPERTIES POLYMERS TRANSITIONS PHASE POLY(DI-N-ALKYLSILOXANE)S MESOGENS SPECTRA
DOI	10.1016/j.polymer.2007.05.026
英文摘要	Five series of binary copolymers, poly [2,5-di(ROOC styrene-co-2,5-di(R'OOC) styrene]s (R=n-C3H7-, R'=C2H5-, n-C4H9-, and n=C5H11-; R=n=C6H13-, R'=n-C4H9-, and n-C5H11-), were synthesized via free radical polymerization. The random nature of the copolymers was expected on the basis of the assumed similar reactivities of the analogous monomers and proved by C-13 NTMR analysis. It was also implied by the smoothly varying glass transition temperatures and further supported by the monotonous variation in d spacings for the liquid crystalline copolymers, where both corresponding homopolymers are liquid crystals. Subtle difference of R and R' was found to have significant impact on the mesomorphic properties of the copolymers. When the pair of the corresponding homopolymers has the same mesogenic structure, a difference of one carbon atom in the alkyl chain can be tolerated over the whole copolymer composition range; however, the liquid crystalline structure soon disappears with the incorporation of a co-unit of an homopolymer that is not liquid crystal. For the copolymers with alkyl chain length differing by two carbon atoms, the liquid crystalline structure is lost with the incorporation of relatively low co-unit content despite the pair of corresponding homopolymers having the same mesogenic structure. (c) 2007 Elsevier Ltd. All rights reserved.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000247855300041&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Polymer Science; SCI(E); EI; 11; ARTICLE; 14; 4252-4263; 48
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/250248]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Tang, Hui,Cao, Hong-Qing,Zhu, Zhi-Guo,et al. Synthesis and mesophase behaviors of 2,5-disubstituted styrene-based random copolymers: Effect of difference in side-group length on liquid crystallinity[J]. polymer,2007.
APA	Tang, Hui,Cao, Hong-Qing,Zhu, Zhi-Guo,Wan, Xin-Hua,Chen, Xiao-Fang,&Zhou, Qi-Feng.(2007).Synthesis and mesophase behaviors of 2,5-disubstituted styrene-based random copolymers: Effect of difference in side-group length on liquid crystallinity.polymer.
MLA	Tang, Hui,et al."Synthesis and mesophase behaviors of 2,5-disubstituted styrene-based random copolymers: Effect of difference in side-group length on liquid crystallinity".polymer (2007).