Thermal stability of networks containing siloxane linkages

Abstract
The thermal stability of elastomers containing siloxane linkages has been compared using the technique of chemical stress relaxation in an inert environement. Enhancement of the already high stability of the basic poly (dimethyl siloxane) silicone rubber by the substitution of hetero groups in and on the main chain was proved, with the exception of the pendent trifluoroporopyl group. Particulary dramatic was the effect of the mcarborane moiety in the SiB‐2 elastomers which elevated the stability of the siloxane chain by more than 100°C relative to silicone rubber.

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