Vinyl‐terminated benzoxazine (VB‐a), which can be polymerized through ring‐opening polymerization, was synthesized through the Mannich condensation of bisphenol A, formaldehyde, and allylamine. This VB‐a monomer was then blended with epoxy resin and then concurrently thermally cured to form an epoxy/VB‐a copolymer network. To understand the curing kinetics of this epoxy/VB‐a copolymer, dynamic differential scanning calorimetry measurements were performed by the Kissinger and Flynn–Wall–Ozawa methods. Fourier transform infrared (FTIR) analyses revealed the presence of thermal curing reactions and hydrogen‐bonding interactions of the epoxy/VB‐a copolymers. Meanwhile, a significant enhancement of the ring‐opening and allyl polymerizations of the epoxy was observed. For these interpenetrating polymer networks, dynamic mechanical analysis and thermogravimetric analysis results indicate that the thermal properties increased with increasing VB‐a content in the epoxy/VB‐a copolymers.
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Kuo et al. (2010) studied this question.
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