Polyetherimide/polyvinylpyrrolidone vapor permeation membranes. Physical and chemical characterization

被引:26
作者
Cranford, RJ [1 ]
Darmstadt, H [1 ]
Yang, J [1 ]
Roy, C [1 ]
机构
[1] Inst Pyrovac Inc, St Foy, PQ G1P 4C7, Canada
关键词
skin; vapor permeation; blend membrane; ESCA; water treatment;
D O I
10.1016/S0376-7388(98)00316-0
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Integrally skinned capillary tube membranes were prepared by the wet-phase inversion method. A series of polyetherimide (PEI, Ultem 1000) membranes were prepared with varying amounts of polyvinylpyrrolidone (PVP) in the casting solution. The surfaces of the membranes were analyzed by electron spectroscopy for chemical analysis (ESCA). It was found that the molecular structure of PEI, both with and without PVP, changes considerably during membrane preparation. The ESCA results indicated that the amount of PEI nitrogen remaining fully imidized at the surface varied in the range 63-86%. The PVP/PEI mass ratio at the membrane surface was found to increase linearly from 0 to 0.10 as the ratio was increased from 0 to 0.43 in the casting solution. The PVP/PEI mass ratio in the membrane bulk was determined by thermogravimetric analysis (TGA) to reach a maximum of 0.067. Vapor permeation experiments were done with a water/n-propanol mixture. The addition of PVP increased the membrane selectivity (alpha=P-A/P-B, A=water, B=1-propanol) from 76 to 810, while the permeance for water remained relatively constant at 1.3 x 10(-6) mol/m(2) s Pa. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:231 / 240
页数:10
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