Heat Resistant Polymers Containing the Low Molecular Weight Closo-Carboranes. II. Thermal Behavior of Polycarboranesiloxane SiB-1 Elastomers from C2B5H7.
CHEMICAL SYSTEMS INC SANTA ANA CALIF
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Unmodified 5-SiB-1 polymers have been found to be at least equivalent to their 10-SiB-1 counter-parts with respect to thermal stability. The 5-SiB-1 polymers, moreover, are substantially more amenable to conversion into elastomers. The introduction of 15 to 20 mole per cent of m-C2B10 into the 5-SiB-1 backbone results in elastomers whose thermal stability, although less than that of the parent homopolymer is, nevertheless, substantially in excess of the published values for other carboranesiloxane polymers. The crystallization of the 5-SiB-1 copolymer containing 15 mole per cent C2B10 was inhibited by irradiation with 50 megarads of 3 mev betas. The 5-SiB-1 copolymer containing 20 mole per cent C2B10 on the other hand, remained a rubber at room temperature. Author
- Polymer Chemistry
- Elastomers and Rubber