Effects of casting solvents on the formation of inverted phase in block copolymer thin films

doi:10.1021/ma0498621

CORC > 化学研究所 > 中国科学院化学研究所

	Effects of casting solvents on the formation of inverted phase in block copolymer thin films
	Huang, HY ; Hu, ZJ ; Chen, YZ ; Zhang, FJ ; Gong, YM ; He, TB ; Wu, C
刊名	MACROMOLECULES
	2004-08-24
卷号	37 期号:17 页码:6523-6530
ISSN号	0024-9297
DOI	10.1021/ma0498621
英文摘要	Previously, an inverted phase (the minority blocks comprising the continuum phase) was found in solution-cast block copolymer thin films. In this study, the effect of casting solvents on the formation of inverted phase has been studied. Two block copolymers, poly(styrene-b-butadiene) (SB) (M-w = 73 930 Da) and poly(styrene-b-butadiene-b-styrene) (SBS) (M-w = 140 000 Da), with comparable block lengths and equal polystyrene (PS) weight fraction (similar to30 wt %) were used. The copolymer thin films were cast from different solvents, toluene, benzene, cyclohexane, and binary mixtures of benzene and cyclohexane. Toluene and benzene are good solvents for both PS and PB, but have a preferential affinity for PS, while cyclohexane is a good solvent for PB but a Theta solvent for PS (T-Theta = 34.5 degreesC). The differential solvent affinity for PS and PB was estimated in terms of a difference between the polymer-solvent interaction parameter, chi, for each block. Under an extremely slow solvent evaporation rate, the time-dependent phase behavior during such a solution-to-film process was examined by freeze-drying the samples at different stages, corresponding to different copolymer concentrations, rho. Our results indicate that the slight interaction difference between solvent and each block influences the effective volume fraction of each domain and drives the solution to form a transient inverted phase at the early stage of the microphase separation.
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000223448300036
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/55639]
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.Chinese Univ Hong Kong, Dept Chem, Shatin, Hong Kong, Peoples R China
推荐引用方式 GB/T 7714	Huang, HY,Hu, ZJ,Chen, YZ,et al. Effects of casting solvents on the formation of inverted phase in block copolymer thin films[J]. MACROMOLECULES,2004,37(17):6523-6530.
APA	Huang, HY.,Hu, ZJ.,Chen, YZ.,Zhang, FJ.,Gong, YM.,...&Wu, C.(2004).Effects of casting solvents on the formation of inverted phase in block copolymer thin films.MACROMOLECULES,37(17),6523-6530.
MLA	Huang, HY,et al."Effects of casting solvents on the formation of inverted phase in block copolymer thin films".MACROMOLECULES 37.17(2004):6523-6530.