The controllable construction and properties characterization of organic–inorganic hybrid materials based on benzoxazine-bridged polysilsesquioxanes

Abstract

Using a hydrolysis condensation of triethoxysilane to prepare a synthetic benzoxazine-bridged bis(triethoxysilane) compound (BS), a series of benzoxazine-bridged polysilsesquioxanes precursors were prepared with different degrees of hydrolysis condensation. Ring-opening thermal homopolymerization of the benzoxazine rings in these precursors was employed to obtain several organic–inorganic hybrid materials. The chemical structures of these synthetic compounds were characterized by Fourier transform infrared (FTIR) spectroscopy, nuclear magnetic resonance (¹H, ¹³C, ²⁹Si NMR) spectroscopy and elemental analysis (EA). For the morphologies of these hybrid materials, different features of the lamellar structures were explored by transmission electron microscopy (TEM). From the results of energy dispersive X-ray spectroscopy (EDS), these lamellar structures were found to be comprised of carbon-rich (C-rich) and silicon-rich (Si-rich) layers. From a view-point of the structure–property relationships, the optical (photoluminescence (PL)), thermal (glass transition temperature (T_g) and thermogravimetric analysis (TGA)) properties were well characterized and discussed. Based on these results, we proposed that this chemically controllable method has potential as an effective approach used to prepare organic–inorganic hybrid materials with controllable morphology.