Synthesis and thermal studies of bisphenol-A based bismaleimide
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The compound 2,2-bis[4-(4-maleimidophenoxy phenyl)]propane was prepared by the imidization of bisamic acid of 2,2-bis(4-aminophenoxy phenyl)propane. Various nanoclays were blended with this bismaleimide and thermally cured. The structural characterization of the synthesized materials and the thermal properties of the bismaleimide and their blends were investigated through FTIR, 1H and 13C NMR, differential scanning calorimetry and thermo gravimetric analysis. Among the various clays investigated, Cloisite 15A shows strong influence on the cure exotherm of bismaleimide. Introduction of clay mineral into bismaleimide shifts the onset of curing exotherm to higher temperature and is nearly 40 °C. The thermal stability of the clay loaded cured bismaleimide increases and the presence of clay particles in the cured bismaleimide matrix enhances the char formation.
KeywordsBismaleimide Nanoclay FTIR NMR DSC TGA
The authors would like to acknowledge the Directorate of Extramural Research & Intellectual Property Rights (ER & IPR), Defence Research & Development Organization, Ministry of Defence, Government of India, New Delhi-110105 for financially supporting this work under the Grant ERIP/ER/0704359/M/01/1101 dated 12-12-2008. The authors wish to express sincere thanks to Dr. W. Selvamurthy for his keen interest in this research work. Sincere thanks to the Management and the Principal of Kamaraj College of Engineering and Technology, S.P.G.C. Nagar, K. Vellakulam Post-625701, India for providing all the facilities to do this work. Thanks to R. Nagarajan, K. Ponprabhakaran, and N. Thangakameshwaran for their participation in this work.
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