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Bismaleimide/rice husk silica reinforced composites |
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| Authors: | Dharmaraj Rajamani Rajendran Surender Arunjunairaj Mahendran Shanmugam Muthusubramanian Chinnaswamy Thangavel Vijayakumar |
| Institution: | 1. Department of Chemistry, The Standard Fireworks Rajaratnam College for Women, Sivakasi, 626123, India 2. Department of Polymer Technology, Kamaraj College of Engineering and Technology, S.P.G.C. Nagar, K. Vellakulam Post, Virudhunagar, 625701, India 3. Wood Carinthaian Competence Centre, Kompetenzzentrum Holz GmbH, Klagenfurter strasse 87-89, 9300, st. Veit an der Glan, Austria 4. Department of Organic Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai, 625021, India |
| 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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