Hybrid organic-inorganic membranes

被引:57
作者
Cornelius, C [1 ]
Hibshman, C [1 ]
Marand, E [1 ]
机构
[1] Virginia Polytech Inst & State Univ, Dept Chem Engn, Blacksburg, VA 24061 USA
基金
美国国家科学基金会;
关键词
hybrid materials; sol-gel; polyimide-silica; gas permeation; membranes;
D O I
10.1016/S1383-5866(01)00102-2
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The gas separation performance of a series of hybrid polyimide-silica membranes has been compared to Robeson's upper bound for various gas pairs. Exceptional gas separation was achieved primarily with crosslinked polyimides and with hybrid systems subjected to annealing treatments at elevated temperatures. The hybrid materials were prepared by carrying out sol-gel reactions of various alkoxysilanes in the presence of fully imidized polyimides, whose chain ends and backbone have been functionalized to different degrees with triethoxysilane groups. The alkoxysilanes employed included phenyltrimethoxysilane (PTMOS), methyltrimethoxysilane (MTMOS), tetramethylorthosilicate (TMOS), and tetraethylorthosilicate (TEOS). The presence of additional covalent linkage points along the polyimide backbone served to improve both, gas selectivity and gas permeability, primarily in the case of MTMOS-based hybrid materials. While TEOS and TMOS-based hybrid materials exhibited highly homogenous morphologies, the presence of alkyl groups in the PTMOS and MTMOS-based hybrid systems lead to morphologies of various degrees of phase separation. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:181 / 193
页数:13
相关论文
共 42 条
[1]  
BRINKER CJ, 1990, SOL GEL SCI PHYSICS, P1990
[2]   SYNTHESIS OF TRIETHOXYSILYL-TERMINATED POLYOXAZOLINES AND THEIR COHYDROLYSIS POLYMERIZATION WITH TETRAETHOXYSILANE [J].
CHUJO, Y ;
IHARA, E ;
KURE, S ;
SAEGUSA, T .
MACROMOLECULES, 1993, 26 (21) :5681-5686
[3]  
Cornelius C.J., 2000, THESIS VIRGINIA POLY
[4]  
Cranck J., 1975, MATH DIFFUSION, Vsecond
[5]   Basis of permeability/selectivity tradeoff relations in polymeric gas separation membranes [J].
Freeman, BD .
MACROMOLECULES, 1999, 32 (02) :375-380
[6]  
GHOSAL K, 1994, POLYM ADVAN TECHNOL, V5, P673
[7]   A new category of membranes exploiting potentiality of organic/inorganic hybrid materials [J].
Guizard, C ;
Heckenbenner, P ;
Schrotter, JC ;
Hovanian, N ;
Smaihi, M .
BETTER CERAMICS THROUGH CHEMISTRY VII: ORGANIC/INORGANIC HYBRID MATERIALS, 1996, 435 :283-294
[9]   Sol-gel polyimide-silica composite membrane: gas transport properties [J].
Joly, C ;
Goizet, S ;
Schrotter, JC ;
Sanchez, J ;
Escoubes, M .
JOURNAL OF MEMBRANE SCIENCE, 1997, 130 (1-2) :63-74
[10]   Polyimide-silica composite materials: How does silica influence their microstructure and gas permeation properties? [J].
Joly, C ;
Smaihi, M ;
Porcar, L ;
Noble, RD .
CHEMISTRY OF MATERIALS, 1999, 11 (09) :2331-2338