Abstract
AbstractBenzoxazine bearing trimethoxylsilane (BA‐b) was successfully synthesized via Mannich condensation among phenol, paraformaldehyde, and γ‐aminopropyltrimethoxysilane. The hydrolysis and condensation of the BA‐b catalyzed by hydrochloric acid can afford a soluble polysilsesquioxane bearing benzoxazine groups (denoted PSSQ‐b). By initiating the cocuring reaction of PSSQ‐b with difunctional benzoxazine of bisphenol A (BA‐a), the inorganic–organic hybrids of polybenzoxazine with polysilsesquioxane were prepared. The hybrids displayed enhanced Tg's in comparison with the control polybenzoxazine. In terms of initial decomposition temperature (Td) and char and ceramic yields, the hybrids exhibited improved thermal stability as shown by thermogravimetric analysis (TGA). © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99: 927–936, 2006
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