Cohesional entanglement of amorphous polymer in glass state as probed by equilibrium swelling in a "non-solvent"
文献类型：期刊论文
| 作者 | Yu, YS; Qian, RY |
| 刊名 | CHINESE JOURNAL OF CHEMISTRY
 |
| 出版日期 | 2002-11-01 |
| 卷号 | 20期号:11页码:1154-1161 |
| 关键词 | Polymer/solvent System Ps/et2o Ps/me2co Ucst And Lcst Equilibrium Swelling Cohesional Entanglement Cloud Point Curve |
| ISSN号 | 1001-604X |
| 英文摘要 | The equilibrium swelling of the system Polystyrene (PS) (M = 1.7 x 10(5), monodsperse)/diethyl ether at 30 degreesC and 35 degreesC has been studied in detail in quiescent state for a time span over 150 d. Arguments am given to show that the swelling process in a "non-solvent" is a network swelling rather am a phase separation process. It is different from the cloud point curve (CPC) experiment studied in literature, where the experiment starts from a one-phase solution, so that the cohesional entanglement present in the solid polymer is disrupted by dissolution. The cohesional entanglement structure of the solid polymer, on the contrary, is retained in the concentrated phase on swelling, at least in the initial stage. The course of swelling as presented by the curve V-s(t) was found to proceed in three stages, where V. is the volume of the concentrated phase. in the first and third stages of V-s(t), the curve goes up smoothly, while in the second stage the curve V-s(t) shows large up and down jumps, indicating probably a readjustment in the network structure. Some results on a monodisperse PS sample of M = 5.8 x 10(5) and a polydisperse sample of M = 2.0 x 10(5) are also given. The values of V-s observed at swelling equilibrium are not in accord with the expected cloud point temperature. The cloud point curve represents a phase separation process occurring in local regions (space limited to pm) and in time scale of the order of minute, while the process v(s)(t) occurred in the whole space of the concentrated phase, in time scale of days. For quantitative characterization of the network present in the concentrated phase, a precise value of the polymer-solvent interaction parameter chi is needed. |
| 语种 | 英语 |
| WOS记录号 | WOS:000179210800006 |
| 出版者 | SCIENCE CHINA PRESS |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/79349]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Qian, RY |
| 作者单位 | Chinese Acad Sci, Inst Chem, Beijing 100080, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yu, YS,Qian, RY. Cohesional entanglement of amorphous polymer in glass state as probed by equilibrium swelling in a "non-solvent"[J]. CHINESE JOURNAL OF CHEMISTRY,2002,20(11):1154-1161. |
| APA | Yu, YS,&Qian, RY.(2002).Cohesional entanglement of amorphous polymer in glass state as probed by equilibrium swelling in a "non-solvent".CHINESE JOURNAL OF CHEMISTRY,20(11),1154-1161. |
| MLA | Yu, YS,et al."Cohesional entanglement of amorphous polymer in glass state as probed by equilibrium swelling in a "non-solvent"".CHINESE JOURNAL OF CHEMISTRY 20.11(2002):1154-1161. |
入库方式： OAI收割
来源：化学研究所
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