The unknown mechanism of curing reactions of cyanate resins and epoxy resins, which are the typical network polymers, is investigated by molecular orbital calculations. In the case of cyanate resin class, the reaction reasonably promoted by a zinc catalyst is shown to involve a multistep cyclized reaction mechanism. As for the epoxy resin class, a model with basic mechanisms on the nucleophilic addition reactions and the catalytic action is proposed to explain the experimental results. An index to control reactivity of resins has been obtained from such results. It can be applied to design electronic materials for products such as printed wiring boards or to solve problems arising in the process of their development.
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