Epoxide/maleimide systems

Three-Component Cyanate/Epoxide/Maleimide Systems.53... 

In addition to the two-component cyanate/epoxide, cyanate/maleimide and epoxide/ maleimide systems, numerous three-component compositions have been described in 34 Japanese and 2 FRG patent applications. The patent applications differ in curing agents, other additives and applications of the binders obtained. Sometimes the compositions mentioned in Sect. 4 above are given here again, differing in that a bismaleimide is added. 

As in the cyanate/epoxide compositions, polysulfone is used as an additive in cyanate/epoxide/maleimide systems. As an example, a composition for carbon-fiber composites should be mentioned. It contains BPA/DC-BMI prepolymer, epoxide resin and polyethersulfone [111-113] Zn acetate and dicumyl peroxide are added. Polyethersulfone powder was added to the three-component system with 4,4 -diamino-diphenylmethane-based tetraepoxide as one of the epoxy resins used [114]. 

A similar approach to estimating the composition of phase-separated regions and their content, based on the above-mentioned Fox equation, was later used for IPNs based on PU and maleimide-terminated PU [97], PU-epoxide-episulfide resin [102], and other systems. The results were not satisfactory, which can be explained by the approximate nature of the Fox equation (presently, there are a great number of equations connecting the glass transition temperature in compatible blends with transition temperatures of components). 

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