Anisotropic flat sheet membrane formation via TIPS: thermal effects

被引:46
作者
Atkinson, PM [1 ]
Lloyd, DR [1 ]
机构
[1] Univ Texas, Dept Chem Engn, Separat Res Program, Austin, TX 78712 USA
关键词
TIPS; anisotropic flat sheet membrane; thermal effect; membrane formation;
D O I
10.1016/S0376-7388(99)00376-2
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The use of liquid-liquid thermally induced phase separation (TIPS) to produce cellular Rat sheet membranes with an anisotropic nature was investigated theoretically and experimentally for the model system isotactic polypropylene (iPP) and diphenyl ether (DPE). Anisotropic structures were obtained experimentally by evaporating diluent from one surface of a polymer-diluent solution prior to phase separation. The effects of initial sample temperature, atmospheric temperature, and applied cooling rate on membrane cell size and the cell size profile across the membrane thickness were studied using scanning electron microscopy (SEM). The effect of an applied cooling rate was studied for the cases of simultaneous evaporation and cooling and sequential evaporation followed by cooling. The effects of evaporation up to the point of phase separation were investigated theoretically and experimentally; the effects beyond phase separation were investigated experimentally The simultaneous heat acid mass transfer aspects of the evaporation process were modeled up to the point of phase separation. Two measures were used to evaluate the model: the extent of anisotropy in the polymer concentration predicted by the model was compared to the extent of anisotropy observed in the cell size using SEM, and the theoretical and experimental weight loss during evaporation were compared. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:1 / 18
页数:18
相关论文
共 62 条
[1]   MICROPOROUS MEMBRANE FORMATION VIA THERMALLY-INDUCED PHASE-SEPARATION .6. EFFECT OF DILUENT MORPHOLOGY AND RELATIVE CRYSTALLIZATION KINETICS ON POLYPROPYLENE MEMBRANE-STRUCTURE [J].
ALWATTARI, AA ;
LLOYD, DR .
JOURNAL OF MEMBRANE SCIENCE, 1991, 64 (1-2) :55-68
[2]   MATHEMATICAL-ANALYSIS OF FACTORS INFLUENCING SKIN THICKNESS OF ASYMMETRIC REVERSE-OSMOSIS MEMBRANES [J].
ANDERSON, JE ;
ULLMAN, R .
JOURNAL OF APPLIED PHYSICS, 1973, 44 (10) :4303-4311
[3]  
ATKINSON PM, 1999, THESIS U TEXAS AUSTI
[4]   STRUCTURAL COARSENING OF DEMIXED POLYMER-SOLUTIONS [J].
AUBERT, JH .
MACROMOLECULES, 1990, 23 (05) :1446-1452
[5]  
BATARSEH MT, 1999, THESIS U TEXAS AUSTI
[6]   Spinning of hollow porous fibres via the TIPS mechanism [J].
Berghmans, S ;
Berghmans, H ;
Meijer, HEH .
JOURNAL OF MEMBRANE SCIENCE, 1996, 116 (02) :171-189
[7]   PHASE-BEHAVIOR AND STRUCTURE FORMATION IN SOLUTIONS OF POLY(2,6-DIMETHYL-1,4-PHENYLENE ETHER) [J].
BERGHMANS, S ;
MEWIS, J ;
BERGHMANS, H ;
MEIJER, H .
POLYMER, 1995, 36 (16) :3085-3091
[8]  
Bird R.B., 2006, TRANSPORT PHENOMENA, Vsecond, DOI 10.1002/aic.690070245
[9]   POLYMER MEMBRANE FORMATION THROUGH THE THERMAL-INVERSION PROCESS .1. EXPERIMENTAL-STUDY OF MEMBRANE-STRUCTURE FORMATION [J].
CANEBA, GT ;
SOONG, DS .
MACROMOLECULES, 1985, 18 (12) :2538-2545
[10]   POLYMER MEMBRANE FORMATION THROUGH THE THERMAL-INVERSION PROCESS .2. MATHEMATICAL-MODELING OF MEMBRANE-STRUCTURE FORMATION [J].
CANEBA, GT ;
SOONG, DS .
MACROMOLECULES, 1985, 18 (12) :2545-2555