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
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