Low density, resorcinol-formaldehyde aerogels

Details Low density, resorcinol-formaldehyde aerogels Low density, resorcinol-formaldehyde aerogels

1989-09-12

1991-03-05

Foelak, Morton

Catalyst, solid sorbent, or support therefor: product or process

Solid sorbent

Free carbon containing

502402, 502416, 502439, 502437, 521 64, 521181, 521918, B01V 2002, C08V 928

Patent

active

049978047

ABSTRACT:
The polycondensation of resorcinol with formaldehyde under alkaline conditions results in the formation of surface functionalized polymer "Clusters". The covalent crosslinking of these "clusters" produces gels which when processed under supercritical conditions, produce low density, organic aerogels (density.ltoreq.100 mg/cc; cell size .ltoreq.0.1 microns). The aerogels are transparent, dark red in color and consist of interconnected colloidal-like particles with diameters of about 100.circle.. These aerogels may be further carbonized to form low density carbon foams with cell size of about 0.1 micron.

REFERENCES:
patent: 4104208 (1978-08-01), Kido et al.
patent: 4663358 (1987-05-01), Hyon et al.
patent: 4861804 (1989-08-01), Nakamishi
patent: 4863972 (1989-09-01), Itagaki et al.
patent: 4873218 (1989-10-01), Pekala
patent: 4888364 (1989-12-01), Graiver et al.

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