Abstract
Silica derived from the renewable resource rice husk is modified using stearic acid and N-[4-(chlorocarbonyl)phenyl]maleimide. These materials are used as fillers in the bismaleimide, 4,4′-bismaleimidodiphenylmethane (BMIM), and thermally cured. The thermogravimetric (TG) curves for polyBMIM/silica composites showed no pronounced changes compared to the TG curve for the pure polyBMIM. Kissinger–Akahira–Sunose, Flynn–Wall–Ozawa, and Friedman methods are used to compute the activation energy (E a) for degradation. Silica and surface-modified silica using stearic acid dispersed by ultrasonication increase the activation energy for degradation and show considerable influence on the thermal stability of cured BMIM. The long alkyl chain present in the stearic acid modified silica and the bulky spacer present in the chemically modified silica definitely alter the degradation process of cured BMIM. The SEM studies indicated uniform dispersion of the silica particles in the polyBMIM.
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Acknowledgments
The authors wish to express sincere thanks to the management and principal of the respective colleges for providing all facilities to do the work. The authors would like to thank the Directorate of Extramural Research & Intellectual Property Rights (ER&IPR), Defence Research & Development Organization, Ministry of Defence, Government of India, New Delhi-110 105 for financially supporting this work under the Grant ERIP/ER/0704359/M/01/1101 dated 12-12-2008. The authors express their sincere thanks to Dr. W. Selvamurthy for his keen interest in this research work.
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Rajamani, D., Surender, R., Mahendran, A. et al. Bismaleimide/rice husk silica reinforced composites. J Therm Anal Calorim 114, 883–893 (2013). https://doi.org/10.1007/s10973-013-3076-5
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DOI: https://doi.org/10.1007/s10973-013-3076-5