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	Ring-shaped morphology in solution-cast polystyrene-poly(methyl methacrylate) block copolymer thin films
	Gong, YM; Hu, ZJ; Chen, YZ; Huang, HY; He, TB
刊名	Langmuir
	2005-12-06
卷号	21期号:25页码:11870-11877
ISSN号	0743-7463
DOI	10.1021/la052292t
通讯作者	He, tb()
英文摘要	We report observation of ring-shaped morphology formed in thin films of a cylinder-forming polystyrene-b-poly(methyl methacrylate) (ps-b-pmma) diblock copolymer cast from 1,1,2,2-tetrachloroethane (tetra-ce) solution via relatively fast solvent evaporation rates, in which tetra-ce is a good solvent for both blocks but preferential affinity for the minority pmma block. we studied the microstructure of a set of solution-cast block copolymer films dried with different solvent evaporation rates. r. the control with different r leads to keeping microstructures in different solution concentrations (q)and bringing mechanical strain fields with different strength in the film, for which faster evaporation rates result in microstructures of lower solution concentrations and mechanical strain fields of higher strength. as r decreases from rapid evaporation (similar to 0.1 ml/h), the film microstructure evolved from an intermediate ringlike morphology sequentially to ring-shaped morphologies including loose and tight rings and then inverted phase of ps spheres in a pmma matrix and finally reached the equilibrium phase, namely, cylinders of pmma in a ps matrix. in view of the influence of the film constraints, the microstructure of a film with it terraced free surface profile has been examined. the results indicate that the ring-shaped morphology can form as long as the film thickness is larger than a critical value of about one microdomain spacing, in the case where the film thickness is larger than that value, the nature of solvent and the kinetics of solvent evaporation are shown to be mainly responsible for the ring-shaped morphology formation,
WOS关键词	TRIBLOCK COPOLYMER ; DIBLOCK COPOLYMER ; LIGHT-SCATTERING ; PHASE-TRANSITION ; DILUTE-SOLUTION ; INVERTED PHASE ; SOLVENTS ; POLYISOPRENE ; CONFORMATION
WOS研究方向	Chemistry ; Materials Science
WOS类目	Chemistry, Multidisciplinary ; Chemistry, Physical ; Materials Science, Multidisciplinary
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000233730200051
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2377977
专题	中国科学院大学
通讯作者	He, TB
作者单位	Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Grad Sch, Changchun 130022, Peoples R China
推荐引用方式 GB/T 7714	Gong, YM,Hu, ZJ,Chen, YZ,et al. Ring-shaped morphology in solution-cast polystyrene-poly(methyl methacrylate) block copolymer thin films[J]. Langmuir,2005,21(25):11870-11877.
APA	Gong, YM,Hu, ZJ,Chen, YZ,Huang, HY,&He, TB.(2005).Ring-shaped morphology in solution-cast polystyrene-poly(methyl methacrylate) block copolymer thin films.Langmuir,21(25),11870-11877.
MLA	Gong, YM,et al."Ring-shaped morphology in solution-cast polystyrene-poly(methyl methacrylate) block copolymer thin films".Langmuir 21.25(2005):11870-11877.

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