Formation of mesophase mono-domains and micro-structures in thin films of a series of copolyethers containing both odd-numbered methylene units

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	Formation of mesophase mono-domains and micro-structures in thin films of a series of copolyethers containing both odd-numbered methylene units
	Xie, FC ; Liu, JP ; Yan, DH ; He, TB ; Zheng, RQ ; Chen, EQ
刊名	CHINESE JOURNAL OF POLYMER SCIENCE
	2001-07-01
卷号	19 期号:4 页码:391-397
关键词	Main-chain Liquid Crystalline Polymer Structure Morphology
ISSN号	0256-7679
英文摘要	The structural and morphological evolution of mono-domains in thin films has been investigated for a series of liquid crystalline (LC) copolyethers. The copolyethers studied were synthesized by the reaction of 1-(4-hydroxy-4 ' -biphenylyl)-2-(4-hydroxyl-phenyl)propane (TPP) with 1,7-dibromoheptane and 1,11-undecane at different compositions (coTPPs-7/11). In contrast to the solution-cast thin films without annealing, which exhibit the isotropic homogeneous molecular orientation, mono-domains with a homeotropic alignment were found in coTPP-7/11(5/5) after the thin films were annealed in the high-temperature columnar phase (Phi '). Similar to the nucleation process in polymer crystallization, transmission electron microscopic observations show that small mono-domains appear in the initial stage of annealing, where molecules form a uniaxial in-plane chain orientation. With increasing annealing time, the molecular orientation gradually became tilted with respect to the substrate surface, and finally, a uniaxial homeotropic molecular orientation was achieved after a prolonged annealing time. The lateral size of mono-domains was found to increase continuously with annealing time and grew into a circular shape, indicating an isotropic lateral growth scheme which implies a hexagonal molecular packing proved by the electron diffraction experiments.
语种	英语
出版者	SPRINGER-VERLAG BERLIN
WOS记录号	WOS:000169782300008
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/76941]
专题	中国科学院化学研究所
通讯作者	He, TB
作者单位	1.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China 2.Peking Univ, Coll Chem, Dept Polymer Sci & Engn, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Xie, FC,Liu, JP,Yan, DH,et al. Formation of mesophase mono-domains and micro-structures in thin films of a series of copolyethers containing both odd-numbered methylene units[J]. CHINESE JOURNAL OF POLYMER SCIENCE,2001,19(4):391-397.
APA	Xie, FC,Liu, JP,Yan, DH,He, TB,Zheng, RQ,&Chen, EQ.(2001).Formation of mesophase mono-domains and micro-structures in thin films of a series of copolyethers containing both odd-numbered methylene units.CHINESE JOURNAL OF POLYMER SCIENCE,19(4),391-397.
MLA	Xie, FC,et al."Formation of mesophase mono-domains and micro-structures in thin films of a series of copolyethers containing both odd-numbered methylene units".CHINESE JOURNAL OF POLYMER SCIENCE 19.4(2001):391-397.