Morphological and kinetic studies of phase transitions of a side-chain liquid crystalline polymer
文献类型：期刊论文
| 作者 | Tan, CB; Zhang, SF; Xu, M |
| 刊名 | CHINESE JOURNAL OF POLYMER SCIENCE
 |
| 出版日期 | 1999 |
| 卷号 | 17期号:6页码:529-535 |
| 关键词 | Mesophase Transition Kinetics Polarizing Microscopy Side-chain Liquid Crystalline Polymer |
| ISSN号 | 0256-7679 |
| 英文摘要 | The morphological changes of a side-chain liquid-crystalline polymethacrylate during isotropization and liquid-crystallization transitions were studied by means of polarizing microscopy. These transitions were found to be composed of the initiation of a new phase at local places of the old phase matrix and the growth of the new phase: domains. The kinetics of the liquid-crystallization of the polymer from an isotropic melt to a smectic mesophase was also investigated. The isothermal process of the transition can be described by the Avrami equation. The values of the Avrami exponent were found to be around 2.6. which is lower than the value usually obtained for crystallization transition of polymers, but larger than that reported for liquid-crystallization transition of main-chain polymers. These results may indicate the difference in growth geometry of new phase during transition between crystallization and liquid-crystallization in general and between liquid-crystallization of main-chain and side-chain polymers. It was found that the liquid-crystallization of the used side-chain polymethacrylate may occur at small undercoolings with high transformation rate similar to that of main-chain polymers and small-molecule liquid crystals, while the crystallization of polymers can only proceed at large undercoolings. These phenomena can be explained by the idea that the surface free energy of nucleus during liquid-crystallization transition is less than that for crystallization, and evidence was obtained from analysis of the temperature dependence of the transformation rate. |
| 语种 | 英语 |
| WOS记录号 | WOS:000083585100002 |
| 出版者 | SPRINGER-VERLAG SINGAPORE PTE LTD |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/74875]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Xu, M |
| 作者单位 | Chinese Acad Sci, Inst Chem, Polymer Phys Lab, Beijing 100080, Peoples R China |
| 推荐引用方式 GB/T 7714 | Tan, CB,Zhang, SF,Xu, M. Morphological and kinetic studies of phase transitions of a side-chain liquid crystalline polymer[J]. CHINESE JOURNAL OF POLYMER SCIENCE,1999,17(6):529-535. |
| APA | Tan, CB,Zhang, SF,&Xu, M.(1999).Morphological and kinetic studies of phase transitions of a side-chain liquid crystalline polymer.CHINESE JOURNAL OF POLYMER SCIENCE,17(6),529-535. |
| MLA | Tan, CB,et al."Morphological and kinetic studies of phase transitions of a side-chain liquid crystalline polymer".CHINESE JOURNAL OF POLYMER SCIENCE 17.6(1999):529-535. |
入库方式： OAI收割
来源：化学研究所
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