Synthesis and characterization of graft copolymers containing poly(p-phenylene) main chains and mesogen-jacketed liquid-crystalline polystyrene side chains

doi:10.1002/pola.22011

CORC > 化学研究所 > 中国科学院化学研究所

	Synthesis and characterization of graft copolymers containing poly(p-phenylene) main chains and mesogen-jacketed liquid-crystalline polystyrene side chains
	Sun, Li-Mei ; Fan, Xing-He ; Chen, Xiaci-Fang ; Liu, Xiang-Feng ; Zhou, Qi-Feng
刊名	JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
	2007-06-15
卷号	45 期号:12 页码:2543-2555
关键词	Atom Transfer Radical Polymerization (Atrp) Branched Comblike Copolymers Copolymerization Liquid-crystalline Polymers (Lcp) Mesogen-jacketed Liquid-crystalline Polymers
ISSN号	0887-624X
DOI	10.1002/pola.22011
英文摘要	A series of novel comblike mesogen-jacketed liquid-crystalline graft copolymers, poly(p-phenylene)-g-polyl2,5-bis[(4-methoxyphenyl)oxycarbonyllstyrene) (PPP-gPMPCS) copolymers, have been designed and successfully synthesized by a Yamamoto coupling reaction and subsequent atom transfer radical polymerization (ATRP). H-1 NMR spectroscopy, ultraviolet-visible spectra, and gel permeation chromatography (GPC) have been used to confirm the molecular structure of the macroinitiator and the copolymers. A study of the polymerization kinetics of ATRP has shown that the molecular weight of the copolymer increases linearly with the conversion of the monomer, whereas the polydispersity remains narrow (<= 1.28), indicating that the ATRP of 2,5bis[(4-methoxyphenyl)oxycarbonyllstyrene is well controlled. Thermogravimetric analysis and differential scanning calorimetry (DSC) measurements have indicated that the PPP-g-PMPCS copolymers have better thermal stabilities than the macroinitiator, and their thermal stabilities increase with increasing molecular weight. The liquid-crystalline behavior has been examined with polarized optical microscopy, DSC, one-dimensional wide-angle X-ray diffraction (1D WAXD), and two-dimensional wide-angle X-ray diffraction (21) WAXD). The results show that all the comblike copolymers exhibit obvious liquid-crystalline behaviors, even though the GPC molecular weight of the segments of poly{2,5-bis[(4-methoxyphenyl)oxycarbonyllstyrenel} (PMPCS) have been determined to be far less than the critical value of linear PMPCS. Moreover, 11) WAXD measurements show that the temperature at which the comblike mesogen-jacketed liquidcrystalline copolymers can transform into a liquid-crystalline phase is low; about 20 degrees C in comparison with the linear ones. 21) WAXD analysis has revealed that these comblike copolymers should be assigned to a hexatic columnar nematic ((DHN)-D-Phi) phase. (C) 2007 Wiley Periodicals, Inc.
语种	英语
出版者	JOHN WILEY & SONS INC
WOS记录号	WOS:000246894100017
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/61915]
专题	中国科学院化学研究所
通讯作者	Fan, Xing-He
作者单位	1.Peking Univ, Coll Chem & Mol Engn, Minist Educ,Beijing Natl Lab Mol Sci, Key Lab Polymer Chem & Phys, Beijing 100871, Peoples R China 2.Chinese Acad Sci, Coll Chem & Chem Engn, Grad Sch, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Sun, Li-Mei,Fan, Xing-He,Chen, Xiaci-Fang,et al. Synthesis and characterization of graft copolymers containing poly(p-phenylene) main chains and mesogen-jacketed liquid-crystalline polystyrene side chains[J]. JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY,2007,45(12):2543-2555.
APA	Sun, Li-Mei,Fan, Xing-He,Chen, Xiaci-Fang,Liu, Xiang-Feng,&Zhou, Qi-Feng.(2007).Synthesis and characterization of graft copolymers containing poly(p-phenylene) main chains and mesogen-jacketed liquid-crystalline polystyrene side chains.JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY,45(12),2543-2555.
MLA	Sun, Li-Mei,et al."Synthesis and characterization of graft copolymers containing poly(p-phenylene) main chains and mesogen-jacketed liquid-crystalline polystyrene side chains".JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY 45.12(2007):2543-2555.