ICCAS OpenIR
Cohesional entanglement of amorphous polymer in glass state as probed by equilibrium swelling in a "non-solvent"
Yu, YS; Qian, RY
2002-11-01
Source PublicationCHINESE JOURNAL OF CHEMISTRY
ISSN1001-604X
Volume20Issue:11Pages:1154-1161
AbstractThe 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.
KeywordPolymer/solvent System Ps/et2o Ps/me2co Ucst And Lcst Equilibrium Swelling Cohesional Entanglement Cloud Point Curve
Indexed BySCI
Language英语
WOS IDWOS:000179210800006
PublisherSCIENCE CHINA PRESS
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/79350
Collection中国科学院化学研究所
Corresponding AuthorQian, RY
AffiliationChinese Acad Sci, Inst Chem, Beijing 100080, Peoples R China
Recommended Citation
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.
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