Nonisothermal crystallization behavior of the poly(ethylene glycol) block in poly(L-lactide)-poly(ethylene glycol) diblock copolymers: Effect of the poly(L-lactide) block length
文献类型：期刊论文
| 作者 | Yang, Junliang; Zhao, Ting; Cui, Jijun; Liu, Leijing; Zhou, Yunchun; Li, Gao; Zhou, Enle; Chen, Xuesi |
| 刊名 | JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
 |
| 出版日期 | 2006-11-15 |
| 卷号 | 44期号:22页码:3215-3226 |
| 关键词 | Differential Scanning Calorimetry (Dsc) Melt Nonisothermal Crystallization Kinetics Nucleation Wide-angle X-ray Diffraction (Waxd) |
| ISSN号 | 0887-6266 |
| DOI | 10.1002/polb.20886 |
| 英文摘要 | The confined crystallization behavior, melting behavior, and nonisothermal crystallization kinetics of the poly(ethylene glycol) block (PEG) in poly(L-lactide)poly(ethylene glycol) (PLLA-PEG) diblock copolymers were investigated with wideangle X-ray diffraction and differential scanning calorimetry. The analysis showed that the nonisothermal crystallization behavior changed from fitting the Ozawa equation and the Avrami equation modified by Jeziorny to deviating from them with the molecular weight of the poly(L-lactide) (PLLA) block increasing. This resulted from the gradual strengthening of the confined effect, which was imposed by the crystallization of the PLLA block. The nucleation mechanism of the PEG block of PLLA15000-PEG5000 at a larger degree of supercooling was different from that of PLLA2500-PEG5000, PLLA5000-PEG5000, and PEG5000 (the numbers after PEG and PLLA denote the molecular weights of the PEG and PLLA blocks, respectively). They were homogeneous nucleation and heterogeneous nucleation, respectively. The PLLA block bonded chemically with the PEG block and increased the crystallization activation energy, but it provided nucleating sites for the crystallization of the PEG block, and the crystallization rate rose when it was heterogeneous nucleation. The number of melting peaks was three and one for the PEG homopolymer and the PEG block of the diblock copolymers, respectively. (c) 2006 Wiley Periodicals, Inc. |
| 语种 | 英语 |
| WOS记录号 | WOS:000241754000004 |
| 出版者 | JOHN WILEY & SONS INC |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/57977]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Li, Gao |
| 作者单位 | Grad Sch Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yang, Junliang,Zhao, Ting,Cui, Jijun,et al. Nonisothermal crystallization behavior of the poly(ethylene glycol) block in poly(L-lactide)-poly(ethylene glycol) diblock copolymers: Effect of the poly(L-lactide) block length[J]. JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS,2006,44(22):3215-3226. |
| APA | Yang, Junliang.,Zhao, Ting.,Cui, Jijun.,Liu, Leijing.,Zhou, Yunchun.,...&Chen, Xuesi.(2006).Nonisothermal crystallization behavior of the poly(ethylene glycol) block in poly(L-lactide)-poly(ethylene glycol) diblock copolymers: Effect of the poly(L-lactide) block length.JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS,44(22),3215-3226. |
| MLA | Yang, Junliang,et al."Nonisothermal crystallization behavior of the poly(ethylene glycol) block in poly(L-lactide)-poly(ethylene glycol) diblock copolymers: Effect of the poly(L-lactide) block length".JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS 44.22(2006):3215-3226. |
入库方式： OAI收割
来源：化学研究所
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