Synthesis and Characterization of a Novel 2-Oxazoline-Benzoxazine Compound with Incorporated Polyhedral Oligomeric Silsesquioxane

A novel 2-oxazoline-benzoxazine compound (POB) was synthesized and characterized by FT-IR, 1 H-NMR, 13 C-NMR and MS. Simultaneously, octa(aminophenyl)silsesquioxane was also synthesized and incorporated in POB to prepare the nanocomposites. The 1 H-NMR spectra of the formulated POB and OAPS solution showed the reaction of 2-oxazoline ring and amino group at room temperature, the reaction mechanism was suggested for the first time, and finally the product containing benzamidine structure was obtained. DMA results showed that little content of OAPS (0.5 wt%) remarkably enhanced the thermal properties of PolyPOB; however, excessive content of OAPS may be impair the thermal properties of the nanocomposite. It is speculated that the introduced OAPS decreased the packing density of PolyPOB, which led to the decreasing of char yield (at 800°C) with the increasing of OAPS contents. The TEM micrographs indicated that 0.5 wt% content of OAPS dispersed homogenously in PolyPOB matrix, while aggregation will occur in the nanocomposites containing 5 wt% OAPS.