The Curing Behaviors And The Curing Kinetics Of The Vinylester Resin Used In Pultrusion Process

In this paper, by using DSC, DMTA, FTIR and the mechanical test, we studied the co-polymerization cure reaction behaviors and the curing mechanism at different initiators system of the vinyl ester resin HETRON 922 used in pultrusion process, and analyzed the effects of the type and content of the initiators on the curing behavior and the properties of the cured resin, and determined the parameters of the curing kinetics equation and the optimized initiators system and curing conditions. As a result, we produced vinyl ester resin based carbon composites and measured their mechanical performance.Firstly, by using differential scanning calorimeter (DSC), we analyzed the effect of the type and content of initiators on exotherm (ΔH) of the resin cure reaction, found that moderate content and ratio of the initiators system can cause the moderate cure temperature, increase of exotherm (ΔH) and the final degree of cure result from the cooperation effect of the two kinds of initiators. Then, through Fourier Transform Infrared spectrometer (FTIR), we discussed the change of the final degree of cure of the cured resin with different initiators system, and found that the cooperated initiators system can effectively increase the final degree of cure even in low content.In addition, the curing kinetics of the vinyl ester resin was studied by non-isothermal DSC test, and the apparent activation energy(ΔE) and the reaction order(n) of the curing reaction were calculated by using the Kissinger, Ozawa, and Crane equations.On the same time, we discussed the effects of the cure reaction behaviors on the performance of the cured resin by testing the static mechanical performance and the Dynamical Mechanical Thermal Analysis (DMTA), found that the degree of cure and the linked network were all influence the performance of the cured resin, and the cooperated initiators system (P16+Tc) with content of 1.0% and ratio of 1:3 can increase the degree of cure as well as the polymeric network, and lead to polymeric material with excellent mechanical performance and thermal resistance properties .By using isothermal DSC, we studied the phenomenological(empirical) curing kinetics of the vinyl ester resin, obtained the relationship of , and , and by using a non-linear fitting algorithm, we obtained the value of the parameters of the curing kinetics equation, then we drew the curve of them, and compared with that obtained by experiments, and found that the autocatalytic kinetics model with independent reaction order and was more similar with the experimental result then that of .By using isothermal FTIR, we got the relationship of of the vinylerter and styrene respectively and, then we analyzed the construction formation of the cured resin and the curing mechanism of the resin.Finally, we measured the static mechanical performance, DMTA and SEM of the composites made in pultrusion process. By comparing the static mechanical performance, DMTA and SEM made at different pull speeds and post-curing heat treat, we studied the effect of different pull speeds and post-curing heat treat on the mechanical performance and heat resistance of the composites.