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	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
通讯作者	Fan, xing-he(fanxh@pku.edu.cn)
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.
WOS关键词	TRANSFER RADICAL POLYMERIZATION ; COIL BLOCK-COPOLYMERS ; MOLECULAR-WEIGHT ; DIBLOCK COPOLYMERS ; TRIBLOCK COPOLYMER ; POLYMERS ; BEHAVIOR ; BRUSHES ; DESIGN ; MORPHOLOGY
WOS研究方向	Polymer Science
WOS类目	Polymer Science
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
URI标识	http://www.corc.org.cn/handle/1471x/2381813
专题	中国科学院大学
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.

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