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Highly Stable Polymers based on Poly(m -carboranyl-siloxane) Elastomers

Published online by Cambridge University Press:  01 February 2011

Anthony.C. Swain ,
Mogon Patel  and
Julian.J. Murphy
Anthony.C. Swain
Affiliation:
Materials Science and Research Division, AWE, Aldermaston, Reading, RG7 4PR
Mogon Patel
Affiliation:
Materials Science and Research Division, AWE, Aldermaston, Reading, RG7 4PR
Julian.J. Murphy
Affiliation:
Materials Science and Research Division, AWE, Aldermaston, Reading, RG7 4PR
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Abstract

Poly(m-carboranyl-siloxane) elastomers containing a mixture of di-methyl- and methyl(phenyl)-silyl units were synthesised using the Ferric Chloride catalysed condensation reaction between di-chloro-di-organosilane and 1, 7-bis(di-methyl(methoxy)silyl)-m-carborane. These prepared polymers were aged either by heating in air at elevated temperature or by λ-irradiation from a 60Co source. Multinuclear (1H, 13C and 11B) solid and solution state nuclear magnetic resonance was used to evaluate degradation. λ-irradiation doses to 1 MGy were found to induce only a small reduction in elastomer properties as evidenced by a reduction in segmental chain dynamics. Ageing at temperatures below 350°C similarly displayed a small reduction in segmental chain dynamics together and a concomitant weight loss as measured by differential scanning calorimetry. Above 350°C degradation of the elastomer was dramatic with a decreased segmental chain dynamics and oxidation of the carborane cage, vide infra.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 851: Symposium NN – Materials for Space Applications , 2004 , NN8.7
Copyright
Copyright © Materials Research Society 2005

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References

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