Cohesional entanglement of amorphous polymer in glass state as probed by equilibrium swelling in a "non-solvent"

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	Cohesional entanglement of amorphous polymer in glass state as probed by equilibrium swelling in a "non-solvent"
	Yu, YS; Qian, RY
刊名	CHINESE JOURNAL OF CHEMISTRY
	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
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000179210800006
内容类型	期刊论文
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.