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STUDY LEADING TO THE DEVELOPMENT OF REINFORCED HIGH TEMPERATURE ELASTOMERS
BORDEN CO PHILADELPHIA PA
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The reinforcement of a methyl phenyl silicone elastomer was investigated with various chemically modified silica fillers. An improvement from the triphenylsilyl modified filler can be attributed to the bulky steric factor of the triphenylsilyl group in reducing the depolymerization of the silicone. Molecular weight and change in other physical properties were determined during this investigation. Based on the data available, a mechanism of interaction of the silicone base and the filler at high temperature has been proposed. Ozonization of the vinyl-modified silica filler was made and no significant improvements were noted in the silicone rubber. The effects of various chemically modified fillers on the performance of the silica rubber at high temperature were compared. The evaluation of poly-2,6-dimethyl-1,4-phenylene oxide as a thermally stable polymeric diluent in the silicone elastomer was made. Author
APPROVED FOR PUBLIC RELEASE