Synthesis and Properties of Mesogen-Jacketed Liquid Crystalline Polymers Containing Biphenyl Mesogen with Asymmetric Substitutions

doi:10.1002/pola.24757

CORC > 化学研究所 > 中国科学院化学研究所

	Synthesis and Properties of Mesogen-Jacketed Liquid Crystalline Polymers Containing Biphenyl Mesogen with Asymmetric Substitutions
	Zhang, Lanying; Wu, Hongliang; Shen, Zhihao; Fan, Xinghe; Zhou, Qifeng
刊名	JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
	2011-07-15
卷号	49 期号:14 页码:3207-3217
关键词	Liquid-crystalline Polymers (Lcp) Phase Behavior Supramolecular Structures
ISSN号	0887-624X
DOI	10.1002/pola.24757
英文摘要	This work focuses on the design, synthesis, and characterization of a series of mesogen-jacketed liquid crystalline polymers (MJLCPs), poly(alkyl 4'-(octyloxy)-2-vinylbiphenyl-4-carboxylate) (pVBP(m,8), m = 1, 2, 4, 6, 8, 10, 12). For the first time, we realized asymmetric substitutions in the mesogens of MJLCPs. The polymers obtained by conventional free radical polymerization were investigated in detail by a combination of various techniques, such as differential scanning calorimetry, wide-angle X-ray diffraction, and polarized light microscopy. Our results showed that all the polymers were thermally stable, and their glass transition temperatures decreased when m increased. The liquid crystalline (LC) phases that developed at high temperatures and disappeared at low temperatures were strongly dependent on the difference in lengths of alkyl groups on the 4 and 4' substitution positions of the side-chain biphenyl. While poly-mer pVBP(1,8) was not liquid crystalline, columnar liquid crystalline phases were observed for all other pVBP(m,8) (m = 2, 4, 6, 8, 10, 12) polymers. Polymer pVBP(8,8) showed a tetragonal columnar nematic liquid crystalline phase, and the other LC polymers exhibited columnar nematic phases. In additions, the smaller the difference in the lengths of the terminal alkyls, the easier the development of the liquid crystalline phase. Birefringence measurements showed that solution-cast polymer films exhibited moderately high positive birefringence values, indicating potential applications as optical compensation films for liquid crystal displays. (C) 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 49: 3207-3217, 2011
语种	英语
出版者	WILEY-BLACKWELL
WOS记录号	WOS:000291363600022
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/72295]
专题	中国科学院化学研究所
通讯作者	Shen, Zhihao
作者单位	Peking Univ, Coll Chem & Mol Engn, Minist Educ, Beijing Natl Lab Mol Sci,Key Lab Polymer Chem & P, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Lanying,Wu, Hongliang,Shen, Zhihao,et al. Synthesis and Properties of Mesogen-Jacketed Liquid Crystalline Polymers Containing Biphenyl Mesogen with Asymmetric Substitutions[J]. JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY,2011,49(14):3207-3217.
APA	Zhang, Lanying,Wu, Hongliang,Shen, Zhihao,Fan, Xinghe,&Zhou, Qifeng.(2011).Synthesis and Properties of Mesogen-Jacketed Liquid Crystalline Polymers Containing Biphenyl Mesogen with Asymmetric Substitutions.JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY,49(14),3207-3217.
MLA	Zhang, Lanying,et al."Synthesis and Properties of Mesogen-Jacketed Liquid Crystalline Polymers Containing Biphenyl Mesogen with Asymmetric Substitutions".JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY 49.14(2011):3207-3217.