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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

REFERENCES

1. Grimes, R.N., “Carborane”, Academic Press, New York, (1970)Google Scholar
2. Schroeder, H., Schaffling, O.G., Larcher, T.B., Frulla, F.F. and Heying, T.L., Rubber Chem. Technol, 39, 1184, (1960)Google Scholar
3. Peters, E.N. and Kawakami, J.H., J. Polym. Sci. Polym. Phys. Ed., 15, 723, (1977)Google Scholar
4. Knollmueller, K.O., Scott, R.N. and Herbert, K., J. Polym. Sci, Part A-1, 1071, (1971)Google Scholar
5. Mehring, M., “High Resolution NMR Spectroscopy in Solids, 2nd ed. Berlin: SpringerVerlag, (1983)Google Scholar
6. Cohen-Addad, J.P. and Dupeyre, R., Polymer, 24, 400, (1983)Google Scholar
7. Chinn, S.C., Maxwell, R.S., Chambers, D., Balazs, B. and LeMay, J., J. Rad. Phys. Chem., 59(5–6), 493, (2000)Google Scholar
8. Maxwell, R.S. and Balazs, B., J. Chem. Phys, 116(23), 10492, (2002)Google Scholar
9. Folland, R. and Charlesby, A., Int. J. Radiat. Phys. Chem., 8(5), 555, (1976)Google Scholar
10. Kimmich, R., “NMR: Tomography, Diffusometry, Relaxometry”, Berlin, Springer, (1977)Google Scholar
11. Patel, M., Swain, A.C., Skinner, A.R., Mallinson, L.G., Hayes, G.F., Macromol. Symp., 47, 202, (2003)Google Scholar
12. Maxwell, R.S., Cohenour, R., Sung, W., Solyom, D. and Patel, M., Polym. Deg. Stab, 80(3), 443, (2003)Google Scholar