RHEOOPTICAL BEHAVIOR OF BINARY POLYMER BLENDS - THE EFFECT OF SIMPLE SHEAR-FLOW ON PHASE-BEHAVIOR

被引:25
作者
CHEN, ZJ
WU, RJ
SHAW, MT
WEISS, RA
FERNANDEZ, ML
HIGGINS, JS
机构
[1] UNIV CONNECTICUT,DEPT CHEM ENGN,STORRS,CT 06269
[2] UNIV CONNECTICUT,POLYMER SCI PROGRAM,STORRS,CT 06269
[3] UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,DEPT CHEM ENGN,LONDON SW7 2BY,ENGLAND
关键词
D O I
10.1002/pen.760350112
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The phase behavior of polymer blends under simple shear flow has been studied using a custom-designed rheo-optical system consisting of a two-dimensional small-angle light scattering (SALS) device incorporated into a conventional rheometer. Two-dimensional SALS images were gathered for model polymer blend systems with different quiescent phase behavior: polystyrene/polyisobutylene (PS/PIB) that exhibits upper critical solution temperature phase behavior and polystyrene/poly(vinyl methyl ether) (PS/PVME) that shows lower critical solution temperature phase behavior. For the PS/PIB blend, shear-induced phase mixing occurred at a critical shear rate. Below that critical shear rate, the dispersed phase was highly elongated parallel to the flow direction. For PS/PVME blends, a streak scattering pattern was observed even though the sample became optically clear after shearing. We observed, apparently for the first time, the development of a bright-streak pattern from a transient dark-streak pattern for a polymer blend system under shear. Rheo-microscopy studies revealed an intriguing wave pattern that developed coincident with the observation of a streak pattern by SALS. The relationship between the two phenomena has not yet been established.
引用
收藏
页码:92 / 99
页数:8
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