Abstract
AbstractA benzoxazine with siloxane and phenyl sulfone units (BS‐b) was synthesized by using aminopropyltriethoxysilane, 4,4'‐dihydroxydiphenylsulfone and paraformaldehyde as precursors via Mannich condensation. Then the hydrolysis and polycondensation reactions of siloxane units were performed and benzoxazine bearing polysiloxanes (BS‐PSO) were obtained. The ring‐opening polymerization reactions of both BS‐b and BS‐PSO were studied by Fourier transform IR spectroscopy and DSC in non‐isothermal conditions. The kinetics of the polymerization of BS‐b were found to be well described by using an nth‐order kinetic model for n = 0.7 (activation energy 141 kJ mol−1). The BS‐PSO was also used to modify bisphenol‐A‐based benzoxazines (BA‐a), and the morphological structure and thermal properties of the copolymer were investigated. The TGA results indicate that the silane‐functional polybenzoxazines display enhanced initial decomposition temperature and char yields in comparison with poly(BA‐a). These results are believed to be important for the development of new flame‐retardant laminates. © 2017 Society of Chemical Industry
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