Enhanced thermal and dielectric properties of hybrid organic/inorganic shell microcapsule/thermosetting resin nanocomposites

摘要

Epoxy resin as the core of microcapsules (EMs) with a hybrid organic/inorganic shell were utilized with bismaleimide/2,2-diallylbisphenol A (BD) thermosetting resin to develop BD/EMs composites with excellent comprehensive properties. Because of the catalytic effect of environmentally friendly EMs with amine-derivative shell materials on BD resin, high thermal stability inorganic boron nitride (BN) nanoparticles and mesoporous silica (M-SiO2) on the surface of EMs and the chemical interaction at the interface between EMs and matrix, BD with appropriate content of EMs showed higher thermal decomposition temperature and conductivity and lower coefficient of thermal expansion than the BD system. BD/EMs also exhibited better flame retardancy than BD with the presence of BN and M-SiO2 (halogen- and phosphorus-free flame retardant) on the surface of EMs and the flame blocking and retarding effect of hybrid EMs on the BD system. EM content of 15wt% achieved 45, 34 and 32% decreases in peak heat release rate, average heat release rate and effective heat of combustion of the BD system, respectively. Combining the porous M-SiO2 of EMs with the high crosslinking density of the matrix, BD with appropriate content of EMs exhibited better dielectric property than BD. (c) 2017 Society of Chemical Industry