Abstract
In this study, the effects of three different diaryliodonium salts—diaryliodonium tetrafluoroborate (DT), diphenyliodonium hexafluorophosphate (PF) and diphenyliodonium hexafluoroarsenate (AS)—as catalysts on the thermal curing of bisphenol A‐based benzoxazine (BA) were examined. Resin systems consisting of BA and diaryliodonium salts (BA/ArIx) were prepared. The thermal curing behavior and mechanisms of BA/ArIx were investigated by differential scanning calorimetry (DSC) and in-situ Fourier transform infrared (in-situ FTIR) spectroscopy. The thermal curing kinetics and kinetic model of BA/ArIx systems were investigated by non-isothermal DSC. Based on the results obtained from in-situ FTIR, ArIx underwent a two-stage reaction for accelerating the curing of BA. Kinetic data indicate that the BA/ArIx system exhibits activation energy slightly greater than that of BA. Both BA and BA/ArIx followed an autocatalytic kinetic model based on the Friedman method, and the theoretically calculated curves exhibited good agreement with experiment data.
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