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Abstract

Understanding of the mechanism and kinetics of cure for polymer-layered silicate nanocomposites is now the interest of research. The objective of this investigation is to determine the effects of polymer-layered silicate on the cure kinetics of an epoxy resin. The cure process of epoxy resin-organo-montmorillonite (Org-MMT)-2-ethyl-4-methylimidazole (2,4-EMI) nanocomposite with different Org-MMT loadings was in situ monitored with a technique of dynamic torsional vibration method (DTVM) in the isothermal mode. The gel time t _g and the completed cure time t _c can be read directly from the isothermal cure curve, and the results show that the addition of Org-MMT reduces the t _g and increases the rate of curing reaction. The apparent activation energy E _a of cure reaction was estimated by the nonequilibrium thermodynamic fluctuation theory as well. With increasing of cure temperature, the t _g decreased and correspondingly, the cure rate was accelerated. In addition, the theoretical prediction was in good agreement with the experimental results obtained by DTVM.

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Cure Behavior of Epoxy Resin-Montmorillonite-2-Ethyl-4-Methylimidazole Nanocomposite

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