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