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

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 γ- irradiation from a 60Co source. Multinuclear (1H, 13C and 11B) solid and solution state nuclear magnetic resonance was used to evaluate degradation. γ-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.

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Acknowledgments

Some of this work was performed under the auspices of the US Department of Energy by the Lawrence Livermore National Laboratory under contract W-7405-ENG-48. Both the Organic Materials and New Materials teams at AWE are thanked for their support and helpful discussions.

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Correspondence to Anthony. C. Swain.

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Swain, A.C., Patel, M. & Murphy, J. Highly Stable Polymers based on Poly(m-carboranyl-siloxane) Elastomers. MRS Online Proceedings Library 851, 475–479 (2004). https://doi.org/10.1557/PROC-851-NN8.7

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