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
文献类型:期刊论文
作者 | Wei, Yu-han1; Pan, Cai-yuan2; Li, Bin-yao1; Yu, Xin-hong1; Han, Yan-chun1 |
刊名 | CHINESE JOURNAL OF POLYMER SCIENCE
![]() |
出版日期 | 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 |
WOS记录号 | WOS:000289115600007 |
出版者 | SPRINGER |
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. |
入库方式: OAI收割
来源:化学研究所
浏览0
下载0
收藏0
其他版本
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。