USE AMINOMETHYLTERPENOPHENOLS IN EPOXY RESINS

Aminomethylterpenophenols differing in the position of the amino group and its alkyl substituents have been studied as catalysts in the preparation of epoxy resins and stabilizers for their thermal degradation to produce materials with high physicomechanical and thermo-oxidative characteristics. The heat effects of anionic polymerization of an epoxy oligomer in the presence of 2,4,6-tris (dimethylaminomethyl) phenol (UP-606/2), 2-dibutylaminomethyl-6-isobornyl-4-methylphenol (I), 2-isobornyl-4-dimethylaminomethyl-6-methylphenol (II), 2-dimethylaminomethyl-6-isobornyl-4-methylphenol (III), 2,6-diisobornyl-4-dimethylaminomethylphenol (IV) were studied using DSC method. The DSC curves exhibit exothermic peaks, which relate to the polymerization of the oligomer. It is shown that terpenophenols with a dimethylaminomethyl group in the para position relative to the OH group have the highest activity. Heat effects were studied in the polycondensation of an epoxy oligomer with iso-MTHPA in the presence of aminomethylterpenophenols as catalysts. It has been shown that compounds II and IV reduce the temperature of the onset of the reaction by 62 and 8 degrees C, respectively, compared with the commercially available UP-606/2, and in addition the exothermic effect (Q) is increased by 10 J/g and the energy activation (Ea) by 21 kJ/mol of polycondensation reaction with compound II. Aminomethylterpenephenols improve the resistance of the epoxy resin to thermal aging, in which a reduction in strength from 9 to 23% is observed, in the case of UP-606/2, the strength is reduced by 30%. It has been established that the activation energies of the thermooxidative degradation of resins obtained by introducing compounds II and IV are higher by 10 and 40%, respectively, than when using UP-606/2. Strength characteristics of a polymer matrix containing para-dimethylaminomethyl terpenophenol are higher by 25% than with the use of an industrial analogue - UP-606/2 (2,4,6-tris (dimethylaminomethyl) phenol). It was found that the resins obtained with the use of the catalysts 2-isobornyl-4-dimethylaminomethyl-6-methylphenol and 2,6-diisobornyl-4-dimethylaminomethylphenol have the greatest resistance to thermal oxidation.