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US 5,047,225 AGranted
Low density carbonized composite foams
AssigneeThe United States of America as represented by the United States Department of Energy
InventorFung-Ming Kong
Life of this patent
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Abstract
A carbonized composite foam having a density less than about 50 mg/cm.sup.3 and individual cell sizes no greater than about 1 .mu.m in diameter is described, and the process of making it.
Claims7
A low density carbonized polystyrene-resorcinol-formaldehyde composite foam prepared by a process comprising:
- (A) preparing an inverse emulsion of a styrene monomer in water:
- (B) polymerizing said styrene monomer to produce a foam;
- (C) filling said foam with an aqueous resorcinol-formaldehyde solution in an amount sufficent to substantially occupy the cells of said foam;
- (D) curing said resorcinol-formaldehyde in said solution to form a gel;
- and
- (E) heating said resorcinol-formaldehyde gel filled polystyrene foam to a temperature sufficient to carbonize said foam, whereby a foam having a density less than about 50 mg/cm.sup.3 and interlinked cells of a diameter no greater than about 1 .mu.m is produced.
3 more elements
A carbonized composite foam having a density less than about 50 mg/cm.sup.3 and individual cell sizes no greater than about 1 .mu.m in diameter prepared by:
- (A) polymerizing an inverse emulsion of styrene monomers, thereby producing a foam having uniform size cells;
- (B) filling the cells of said foam with a resorcinol-formaldehyde solution;
- (C) curing said resorcinol-formaldehyde solution thereby forming a gel;
- and
- (D) heating said foam to a temperature sufficiently high to carbonize it.
2 more elements
Dependencies are inferred from the claim text.