Bismaleimide/rice husk silica reinforced composites

作者：Rajamani Dharmaraj; Surender Rajendran; Mahendran Arunjunairaj; Muthusubramanian Shanmugam; Vijayakumar Chinnaswamy Thangavel^*

来源：Journal of Thermal Analysis and Calorimetry, 2013, 114(2): 883-893.

DOI：10.1007/s10973-013-3076-5

• Bismaleimide
• Rice husk
• Silica
• Thermogravimetry
• Kinetics
• SEM

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.

• 出版日期2013-11