The action of heat on the polyorganosiloxanes derived from the minerals biotite and pseudowollastonite by trimethylsilylation

✍ Scribed by Cook, Colin B. ;Currell, Brian R. ;Midgley, Henry G. ;Parsonage, John R. ;Thakur, Chandra P.

• Publisher: Wiley (John Wiley & Sons)
• Year: 1979
• Tongue: English
• Weight: 341 KB
• Volume: 11
• Category: Article
• ISSN: 0007-1641
• DOI: 10.1002/pi.4980110403

✦ Synopsis

Abstract

The polyorganosiloxanes prepared by the trimethylsilylation of mineral silicates contain Q [SiO^4^/2] units and M [CH~3~)~3~ SiO^1^/2] units. Investigations into the behaviour of these materials in the temperature range 100‐1000°C and for times varying from 2‐64 hours have shown that a variety of reactions take place with a general increase in number average molecular weight (M~n~). Organophilic polyorganosiloxanes with M~n~ > 6000 can be obtained by heat treatment under vacuum or a stream of nitrogen. The thermal stability of the polymer derived from pseudowollastonite in closed systems in the presence of acid/base catalysts is also reported. This work is part of a general programme to prepare higher molecular weight Q/M polymers with more potential uses as industrial materials than the initially prepared trimethylsilylated derivatives.