Low density, resorcinol-formaldehyde aerogels

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

1988-05-26

1989-10-10

Foelak, Morton

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

Solid sorbent

Free carbon containing

502437, 521 64, 521181, B01J 2002, C08J 928

Patent

active

048732184

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 .ANG.. These aerogels may be further carbonized to form low density carbon foams with cell size of about 0.1 micron.

REFERENCES:
patent: 4221873 (1980-09-01), Volodko et al.
patent: 4309527 (1982-01-01), McAllister et al.
patent: 4336170 (1982-06-01), Horuke et al.
patent: 4409361 (1983-10-01), McAllister et al.

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