Bulk polymerization reaction and pultrusion process application of modified PMMA resin
In order to achieve the production of fiber reinforced polymethyl methacrylate(PMMA)composites through pultru-sion process,different additives were used in the experiment to regulate the polymerization process of PMMA and improve the bulk polymerization of methyl methacrylate(MMA)monomer.Among them,dibutyl phthalate(DBP)was used as a plasticizer,N,N-dimethylaniline(DMA)and butyl acetate(BAC)were used as polymerization reaction adjustment additives,and various additives were mixed into the resin system in a certain proportion for polymerizing.Firstly,the prepolymerization of each resin system was done at 60℃for 20 min to obtain prepolymers.Then,differential scanning calorimetry(DSC)and reaction kinetics analysis were performed on the prepolymers of different systems.The results indicate that the reaction initiation temperature of the system with addition of DMA at different heating rates(β)decreases,and DMA can accelerate the reaction process in the initial stage of polymer-ization.When β is 25℃/min,adding BAC increases the reaction temperature range from 36.1℃to 41.3℃.The Kissinger method and Ozawa method were used for fitting analysis to obtain the average activation energy(Ea)of each system reaction.The addition of DMA reduces the Ea of the system to 40.71 kJ/mol,which is 16.9%lower than the system without the addition of an adjustment additive.Finally,pultrusion experiments were conducted using various resin systems.It is found that only the system with added BAC is able to produce products with qualified quality.Adding a certain amount of BAC additive in the production of fiber rein-forced PMMA composite materials through pultrusion process can slow down the concentrated heat release of resin polymerization and improve product quality.
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