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US 5,629,353 AGranted
Highly cross-linked nanoporous polymers
AssigneeThe Regents of the University of California
InventorsWarren P. Steckle, Jr., Paul G. Apen, Michael A. Mitchell
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Abstract
Condensation polymerization followed by a supercritical extraction step can be used to obtain highly cross-linked nanoporous polymers with high surface area, controlled pore sizes and rigid structural integrity. The invention polymers are useful for applications requiring separation membranes.
Claims5
A process for preparing a cross-linked nanoporous polymer comprising:
- (a) combining under polymerization conditions at least one aromatic monomer and a cross-linking agent chosen from the group of multifunctional acyl halides and benzylic halides.
- (b) allowing polymerization to occur until a copolymer gel is formed;
- (c) removing catalysts and unreacted monomers from said copolymer gel;
- (d) adding liquid carbon dioxide to said copolymer gel;
- (e) removing said liquid carbon dioxide under supercritical conditions.
2 more elements
Dependencies are inferred from the claim text.