Study on curing kinetics of allyl etherified phenolic imine resin
The DSC curves of allyl etherified phenolic imine resin(APMI-F resin)were measured at different heating rates by using differential scanning calorimeter.The curing reaction kinetics of APMI-F resin were studied by using non isothermal thermodynamic research method.Using T-β extrapolation method,the starting temperature Ti,peak temperature Tp,and termination temperature Tf of the curing reaction of APMI-F resin were determined,and it was used as the basis for exploring the curing process of APMI-F resin.The apparent activation energy of APMI-F resin was obtained by Kissinger method and Starink method.The apparent activation energy at different curing degrees was obtained by Starink method and compared with experimental data to verify the accuracy of the curing kinetics model.The research results showed that,(1)The Ti,Tp and Tf of the curing reaction of APMI-F resin were determined by extrapolation method to be 161.09,226.81 and 263.42℃,respectively.(2)The average activation energy obtained by Starink method was higher than that obtained by Kissinger method.(3)During the curing reaction,as the degree of curing increased,the apparent activation energy of APMI-F resin showed a trend of first decreasing and then increasing.In the initial stage of curing,the activation energy decreased due to the decrease in viscosity.As the degree of crosslinking increased,the movement of chain segments was limited,leading to a gradual increase in activation energy.(4)The curing kinetics model of APMI-F resin was successfully established through the Málek method,and compared with experimental data,it was found that the model could well describe the curing process of APMI-F resin.
phenolic imine resinallyl group phenoliccuring reaction kineticsaddition curing reactionapparent activation energy
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