Elastomeric and Mechanical Properties of Poly-m-carboranylenesiloxanes. III

Abstract
Stress relaxation properties of SiB-2 and poly(dimethyl siloxane) were compared in air and pure nitrogen. The effect of a protective filler system was also investigated for these materials. In addition, stress relaxation experiments were conducted on unfilled SiB-1 and SiB-1.5 in air only. The crystalline structure of a special SiB-2 was investigated by X-ray techniques (courtesy of Olin), and by force-temperature experiments. The thermodynamic melting point of SiB-2 was found to be 66°C, and qualitative information was obtained on the crystallite size distribution. The physical and mechanical properties of SiB-1 and a series of random copolymers of SiB-1 and SiB-2 were investigated by modulus-temperature and weight-loss experiments. SiB-1 and all the copolymer compositions investigated were found to have well-developed crystallinity. Thermal stability increased from SiB-2 to SiB-1, as expected.

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