Steric Interaction between Flexible Main Chain and Nonmesogenic Cyclic   Pendants Leading to Thermotropic Liquid Crystalline Property

doi:10.1021/ma101728w

CORC > 北京大学 > 化学与分子工程学院

	Steric Interaction between Flexible Main Chain and Nonmesogenic Cyclic Pendants Leading to Thermotropic Liquid Crystalline Property
	Mei, Xue ; Chu, Yang ; Cui, Jiaxi ; Shen, Zhihao ; Wan, Xinhua
刊名	macromolecules
	2010
关键词	SIDE-GROUPS VINYL-POLYMERS MESOGEN POLYMERIZATION ROTAXANE)S SERIES HELIX ACID SIZE
DOI	10.1021/ma101728w
英文摘要	Nonmesogenic cyclic alkylidene terephthalate is directly connected to flexible polyethylene main chain at every second carbon atom via the phenyl ring to obtain a novel vinyl polymer, poly(alkylidene vinylterephthalate) (PAVT-n), where n (= 10-14 and 16) denotes the number of methylene groups in the side chain. When the molecular weight is large enough, stable hexagonal columnar phases are generated from melt by the PAVT-n polymers with n = 10-13, but not by those containing 14 or 16 methylene groups. Compared with its open-ring counterpart, i.e., poly(dialkyl vinylterephthalate) (PDAVT-n) with linear side chains, PAVT-n has a glass transition temperature (T(g)) over 100 degrees C higher, a much larger persistence length, and a much lower critical molecular weight to form a mesophase. In addition, PDAVT-n enters into isotropic liquid at T(g) and becomes ordered at temperatures well above T(g), whereas PAVT-n forms mesophases immediately above T(g). The strong steric interaction between cyclic pendants and the flexible main chain, which causes PAVT-n to take an extended chain conformation, is considered as the main driving force for PAVT-n to generate mesophases. In a sharp contrast, the mesophase formation of PDAVT-n is known to be an entropy-driven process.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000283693500033&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Polymer Science; SCI(E); EI; 7; ARTICLE; 21; 8942-8949; 43
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/151118]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Mei, Xue,Chu, Yang,Cui, Jiaxi,et al. Steric Interaction between Flexible Main Chain and Nonmesogenic Cyclic Pendants Leading to Thermotropic Liquid Crystalline Property[J]. macromolecules,2010.
APA	Mei, Xue,Chu, Yang,Cui, Jiaxi,Shen, Zhihao,&Wan, Xinhua.(2010).Steric Interaction between Flexible Main Chain and Nonmesogenic Cyclic Pendants Leading to Thermotropic Liquid Crystalline Property.macromolecules.
MLA	Mei, Xue,et al."Steric Interaction between Flexible Main Chain and Nonmesogenic Cyclic Pendants Leading to Thermotropic Liquid Crystalline Property".macromolecules (2010).