عنوان مقاله [English]
Nowadays, the use of prepregs has accelerated the composite manufacturing and has facilitated their processing. To prepare the epoxy prepregs, it is necessary that the resin to be slightly cured in order to maintain the overall shape of the prepreg and to hold the fibers together. Since epoxy resins require heat for curing and also they release heat through the curing reaction, it has always been difficult to control the amount of curing in the pre-curing stage. The content of resin pre-curing reaction determines the mechanical properties and processability of the prepregs. One of the methods to control the degree of curing of epoxy resin for use in prepregs, is to use two different curing systems with different curing conditions for each stage called dual curing system. This paper introduces the types of dual curing systems used for epoxy resin such as epoxy-acrylate, epoxy-phenol, epoxy-thiol, epoxy-siloxane, epoxy-sulfonium salt and epoxy-amine and also the applications of each dual-curing system. Different dual curing systems can be used to control the properties such as viscosity, curing percentage, storage time and also improve the properties of the final composite. Studies show that to increase the storage time of prepregs, using an optical click reaction for the first curing step and a thermal click reaction for the second curing step is most effective.