Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1995-07-28
1996-06-11
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
528 12, C08J 900
Patent
active
055256430
ABSTRACT:
Microporous aerogel and xerogel compositions are prepared by a random polymerization reaction of a silanol-terminated polydimethylsiloxane (PDMS) and tetraethoxysilane (TEOS) and/or methyltriethoxysilane (MTEOS) at a molar ratio of at least about 0.012 of the PDMS to TEOS and/or MTEOS to form a gel. The reaction is in the presence of an acid catalyst at a molar ratio of at least about 0.5 acid to TEOS and/or MTEOS, water at a molar ratio in the range of from about 6 to about 15 of the water to TEOS and/or MTEOS and a solvent at a minimum molar ratio of about 4 of the solvent to TEOS and/or MTEOS. In the preparation process, the gel is aged. When elevated temperatures of at least about 40.degree. C. up to the boiling point of the solvent are used in aging, the gel can be aged for a period of at least about 24 hours. At temperatures from ambient up to about 40.degree. C., the gel is aged for a minimum of about 48 hours.
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"Rubbery Ormosils and Their Applications", John D. Mackenzie, Y. J. Chung, Y. Hu; Journal of Non-Crystalline Solids, 147&148, 1992, pp. 271-279.
"Rubbery Ormosils", Young J. Chung, Su-Jen Ting, John D. Mackenzie; Materials Research Society Symp. Proc., vol. 180, 1990, pp. 981-986.
"Rubber-like Elasticity of Organically Modified Silicates", Y. Hu, J. D. Mackenzie, Journal of Materials Science, 27, 1992, pp.4415-4420.
Boulis Aheed G.
Macip-Boulis M. Antonieta
Armstrong World Industries Inc.
Foelak Morton
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