Preparation and Properties of Hybrid Materials Originating from Polybenzoxazines and Silsesquioxanes

A benzoxazine-bridged bis(triethoxysilane) (BFS) compound is synthesized by a condensation reaction and characterized. Different ratios of BFS are integrated into 6,6-(1-methylethyliden)-bis-(3,4-dihydro-3-phenyl-2H-1,3-benzoxaizne) (Ba) through solution mixing; thermally hybrid-cured polymers are obtained. The neat, cured polymers (PBFS100) based on BFS display low water absorption, low dielectric constant, and a glass-transition temperature (Tg) of 169 degrees C. The thermal properties, water absorption, and dielectric properties of the hybrid polymers are markedly improved due to the incorporation of BFS. Electron microscopy observation reveals that the polymer hybrid features a self-assembled lamellar structure responsible for the enhanced properties of polybenzoxazine/silsesquioxane composites.