MORPHOLOGICAL-STUDIES OF LATE-STAGE SPINODAL DECOMPOSITION IN POLYSTYRENE-CYCLOHEXANOL SYSTEM

被引:15
作者
GUO, HF
LAXMINARAYAN, A
CANEBA, GT
SOLC, K
机构
[1] MICHIGAN TECHNOL UNIV,DEPT CHEM ENGN,HOUGHTON,MI 49931
[2] MICHIGAN MOLEC INST,MIDLAND,MI 48640
关键词
D O I
10.1002/app.1995.070550512
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
We studied the late-stage spinodal decomposition of the polystyrene-cyclohexanol system in relation to membrane formation. Phase separation was effected by the removal of thermal energy from the homogeneous polymer solution. The ultimate morphology of the phase-separated systems has been studied using electron microscopy and has been found to be strongly affected by the quenching time. A shift from a highly interconnected open-cell structure to a closed-cell structure has been observed, indicating the transition of the spinodal decomposition from early to late stages. The cell growth in the late stage has been quantitatively analyzed and a power-law relationship between the cell size and quenching time has been found. The resulting exponent of 0.61 is consistent with literature values from light-scattering measurements, as well as from theoretical derivations. (C) 1995 John Wiley & Sons, Inc.
引用
收藏
页码:753 / 759
页数:7
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