Pyrolysis of ceramic precursors to nanoporous ceramics

Details Pyrolysis of ceramic precursors to nanoporous ceramics Pyrolysis of ceramic precursors to nanoporous ceramics

1997-01-03

1999-02-16

Glass, Margaret W.

Compositions: ceramic

Ceramic compositions

Pore-forming

501 87, 501 88, 501 81, 528 25, 528 5, 528 4, 528 7, 528 32, 528 35, 528 38, 528 43, 528 10, 528 33, C04B 3806

Patent

active

058720707

ABSTRACT:
The present invention provides for amorphous, nanoporous, ceramic material having a surface area in excess of 70 m.sup.2 /gm and characterized by a high content of open microporous cell structure wherein the micropores have a mean width of less than 20 Angstroms and wherein said microporous structure comprises a volume of greater than about 0.03 cm.sup.3 /gm of the ceramic. The invention also provides a process for the preparation of such nanoporous ceramics wherein a ceramic precursor polymer or oligomer is gradually heated in the presence of an inert gas or vacuum up to a maximum temperature in the range of greater than 400.degree. C. up to about 650.degree. C. Optionally, the process may also include a crosslinking step conducted prior to the heating step wherein the precursor polymer or oligomer is heated in the presence of a crosslinking agent capable of undergoing addition or substitution reactions with backbone atoms present in said precursor material, at an intermediate temperature of about 100.degree. to 400.degree. C. for a period of time sufficient to crosslink said precursor material, followed by pyrolysis of the crosslinked material.

REFERENCES:
patent: 5132354 (1992-07-01), DeLaet
patent: 5236651 (1993-08-01), Garvey et al.
patent: 5266207 (1993-11-01), Boye et al.
patent: 5514350 (1996-05-01), Kear et al.

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