FLOW-INDUCED MIXING AND DEMIXING IN POLYMER BLENDS

被引:120
作者
HINDAWI, IA [1 ]
HIGGINS, JS [1 ]
WEISS, RA [1 ]
机构
[1] UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,DEPT CHEM ENGN,LONDON SW7 2BY,ENGLAND
关键词
SHEAR FLOW; MISCIBILITY; POLYMER BLENDS; CLOUD POINT; LIGHT SCATTERING; GLASS TRANSITION; DEMIXING; LOWER CRITICAL SOLUTION TEMPERATURE;
D O I
10.1016/0032-3861(92)91133-M
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The effect of shear flow on the phase behaviour of partially miscible polymer blends exhibiting a lower critical solution temperature behaviour was investigated. Miscibility was detected, with and without the application of flow, as a change from optical clarity to turbidity using light scattering and as a shift in the glass transition temperature. Light scattering data were collected on a rheo-optical device that was designed to monitor phase changes in polymer blends undergoing shear flow between parallel glass plates in a temperature-controlled environment. Glass transition temperatures of quenched sheared blends were measured using a differential scanning calorimeter. It was found that shear-induced demixing and shear-induced mixing may be observed within the same blend depending on the magnitude of the applied flow. The magnitude of the increase or decrease in the lower critical solution temperature varied with the blend composition and also among the three blends used in this study.
引用
收藏
页码:2522 / 2529
页数:8
相关论文
共 31 条
[1]   NEW DEVELOPMENTS IN THE STUDY OF BINARY FLUIDS UNDER SHEAR-FLOW [J].
BEYSENS, D ;
GBADAMASSI, M ;
MONCEFBOUANZ, B .
PHYSICAL REVIEW A, 1983, 28 (04) :2491-2509
[2]   LIGHT-SCATTERING STUDY OF A CRITICAL MIXTURE WITH SHEAR-FLOW [J].
BEYSENS, D ;
GBADAMASSI, M ;
BOYER, L .
PHYSICAL REVIEW LETTERS, 1979, 43 (17) :1253-1256
[3]  
BIRD RB, 1962, CHEM ENG SCI, V17, P33
[4]   COMPARISON BETWEEN MORPHOLOGY AND RELAXATION PROCESSES IN PARTIALLY PHASE-SEPARATED POLYMER BLENDS [J].
FERNANDEZ, ML ;
HIGGINS, JS ;
TOMLINS, PE .
POLYMER, 1989, 30 (01) :3-10
[5]  
FRUITWALA H, 1989, MACROMOLECULES, V22, P3674
[6]   MISCIBILITY AND KINETICS OF PHASE-SEPARATION IN POLYMER BLENDS OF TETRAMETHYL-BISPHENOL-A POLYCARBONATE AND POLYSTYRENE [J].
GUO, W ;
HIGGINS, JS .
POLYMER, 1990, 31 (04) :699-706
[7]  
GUO W, 1989, THESIS IMPERIAL COLL
[8]  
HAN CD, 1981, MULTIPHASE FLOW POLY, pCH5
[9]   TIME-RESOLVED LIGHT-SCATTERING-STUDIES ON KINETICS OF PHASE-SEPARATION AND PHASE DISSOLUTION OF POLYMER BLENDS .1. KINETICS OF PHASE-SEPARATION OF A BINARY MIXTURE OF POLYSTYRENE AND POLYVINYL METHYL-ETHER) [J].
HASHIMOTO, T ;
KUMAKI, J ;
KAWAI, H .
MACROMOLECULES, 1983, 16 (04) :641-648
[10]   LARGE FLUCTUATIONS IN POLYMER-SOLUTIONS UNDER SHEAR [J].
HELFAND, E ;
FREDRICKSON, GH .
PHYSICAL REVIEW LETTERS, 1989, 62 (21) :2468-2471