Effect of molecular weight and film thickness on the crystallization and microphase separation in polystyrene-block-poly(L-lactic acid) thin films at the early stage

doi:10.1007/s10118-011-1040-z

CORC > 化学研究所 > 中国科学院化学研究所

	Effect of molecular weight and film thickness on the crystallization and microphase separation in polystyrene-block-poly(L-lactic acid) thin films at the early stage
	Wei, Yu-han 1; Pan, Cai-yuan 2; Li, Bin-yao 1; Yu, Xin-hong 1; Han, Yan-chun 1
刊名	CHINESE JOURNAL OF POLYMER SCIENCE
	2011-05-01
卷号	29 期号:3 页码:325-335
关键词	Crystallization Microphase Separation Molecular Weight Film Thickness Early Stage
ISSN号	0256-7679
DOI	10.1007/s10118-011-1040-z
英文摘要	We investigated the effects of molecular weight and film thickness on the crystallization and microphase separation in semicrystalline block copolymer polystyrene-block-poly(L-lactic acid) (PS-b-PLLA) thin films, at the early stage of film evolution (when T (g) < T < T (ODT)) by in situ hot stage atomic force microscopy. For PS-b-PLLA 1 copolymer which had lower molecular weight and higher PLLA fraction, diffusion-controlled break-out crystallization started easily. For PS-b-PLLA 2 with higher molecular weight, crystallization in nanometer scales occurs in local area. After melting of the two copolymer films, islands were observed at the film surface: PS-b-PLLA 1 film was in a disordered phase mixed state while PS-b-PLLA 2 film formed phase-separated lamellar structure paralleling to the substrate. Crystallization-melting and van der Waals forces drove the island formation in PS-b-PLLA 1 film. Film thickness affected the crystallization rate. Crystals grew very slowly in much thinner film of PS-b-PLLA 1 and remained almost unchanged at long time annealing. The incompatibility between PS and PLLA blocks drove the film fluctuation which subsequently evolved into spinodal-like morphology.
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000289115600007
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/72643]
专题	中国科学院化学研究所
通讯作者	Yu, Xin-hong
作者单位	1.Chinese Acad Sci, Grad Sch, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China 2.Univ Sci & Technol China, Dept Mat Sci & Engn, Hefei 230026, Peoples R China
推荐引用方式 GB/T 7714	Wei, Yu-han,Pan, Cai-yuan,Li, Bin-yao,et al. Effect of molecular weight and film thickness on the crystallization and microphase separation in polystyrene-block-poly(L-lactic acid) thin films at the early stage[J]. CHINESE JOURNAL OF POLYMER SCIENCE,2011,29(3):325-335.
APA	Wei, Yu-han,Pan, Cai-yuan,Li, Bin-yao,Yu, Xin-hong,&Han, Yan-chun.(2011).Effect of molecular weight and film thickness on the crystallization and microphase separation in polystyrene-block-poly(L-lactic acid) thin films at the early stage.CHINESE JOURNAL OF POLYMER SCIENCE,29(3),325-335.
MLA	Wei, Yu-han,et al."Effect of molecular weight and film thickness on the crystallization and microphase separation in polystyrene-block-poly(L-lactic acid) thin films at the early stage".CHINESE JOURNAL OF POLYMER SCIENCE 29.3(2011):325-335.