Abstract
This work is devoted to the non-isothermal kinetic analysis of the curing process of benzoxazine - epoxy alloys in a wide range of ratios by the DSC method. Compositions consisted of benzoxazine (BA-mt) based on bisphenol A and m-toluidine and epoxy resin based on bisphenol A (KER 828). The dependencies of the isoconversional activation energy on the extent of conversion for all systems were obtained according to the methods developed by Vyazovkin. These dependencies indicated a complex multi-step curing mechanism. Based on the calculated values of the isoconversional activation energy dependencies, some isothermal predictions were made. It is shown that in order to derive an optimal mathematical model that describes well the real process under isothermal conditions, it is necessary to take into account diffusion limitations, which may be associated with the process of vitrification of systems during the curing process. The possibility of vitrification of systems was proved in terms of oscillatory rheology. In general, it was shown that the addition of epoxy oligomer to the benzoxazine resin significantly slowed down the curing process. However, we suppose that cure for all systems under study was complete, that was confirmed by FTIR data. The kinetic model for the curing process of BA-mt benzoxazine was derived.
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