The molecular structure of epoxy resin matrix contains a large number of hydroxyl americium polar groups, which has high hygroscopicity, which makes the mechanical properties and dielectric properties of its composite products decline sharply under wet and hot conditions. Cyanate ester is a thermosetting resin with -OCN functional group at the end.

The molecular structure of epoxy resin matrix contains a large number of hydroxyl americium polar groups, which has high hygroscopicity, which makes the mechanical properties and dielectric properties of its composite products decline sharply under wet and hot conditions. Cyanate ester is a thermosetting resin with-OCN functional group at the end. Due to the high electronegativity of oxygen atoms and nitrogen atoms, they have a * * vibration structure, and the bond energy between carbon and nitrogen atoms is low and easy to open, so they can be directly polymerized or polymerized by active hydrogen-containing compounds such as epoxy resin after heating, giving the resin excellent dielectric properties, good mechanical properties and wet heat resistance. Modifying epoxy resin with cyanate ester resin can greatly improve the wet and heat properties of cured resin and obviously improve its impact resistance. Composite materials made of epoxy resin cured by cyanate ester resin have been widely used in many fields such as electronics, electrical appliances, aerospace and so on.

The curing reaction between cyanate ester and epoxy resin is very complicated, and the reaction process is controversial. At present, however, it is generally believed that the curing reaction mechanism of * * * includes: firstly, cyanate ester self-polymerizes to form triazine ring, epoxy group and cyanate ester group * * polymerize to form oxazolidine, and then the triazine ring reacts with the remaining epoxy group to form isocyanurate, which can further react with epoxy group to form oxazolidinone and oxazolidinone at the same time.

The curing reaction between cyanate ester and epoxy resin is carried out under certain conditions, so there are many factors that affect the structure and properties of the final product. The epoxy resin cured by cyanate ester can be completely cured without catalyst or with catalyst. Without catalyst, the reaction is slow, so the catalyst can obviously promote the curing reaction, reduce the curing temperature and shorten the curing time, so the catalyst is generally used in the reaction of cyanate ester modified epoxy resin. There are many kinds of catalysts, such as organometallic salts, acid-base composite systems, imidazoles and so on. The addition of catalyst generally has a great influence on the curing reaction mechanism of * * * *, but the composition of the final product is different, which may be because there are various reactions in the process of curing epoxy resin with cyanate ester, and the catalyst has different promotion effects on various reactions. Therefore, the composition of the product was changed, and the mechanical properties and thermal stability of the cured resin were affected. Therefore, it is of great significance to understand the catalytic activity of catalyst and the influence of reaction products on production practice.