Phosphazene-Triazine Polymers by Alder-ene Reaction

Abstract

Cyclomatrix phosphazene-triazine polymers were synthesized by co-curing a blend of tris (2-allylphenoxy) triphenoxy cyclotriphosphazene (TAP) and tris (2-allylphenoxy) s-triazine (TAT) with bis-(4-maleimido phenyl) methane (BMM). The co-curing of the three component resin was investigated by dynamic mechanical analysis using rheometry. The cured polymers with a phosphazene-triazine ratio of one and varying BMI-content were evaluated for their physical, thermal and mechanical properties. Tensile strength tended to decrease and the modulus increased with a corresponding decrease in elongation on enhancing the maleimide-content. The tensile properties were better for a composition with an allyl/maleimide ratio of two. Dynamic mechanical analyses implied a continuous modulus decrease with rise in temperature. The temperature of onset of thermal degradation and Tg of the cured polymers increased in proportion to the maleimide–content. Phosphazene and triazine were conducive to a reduction in the rate of thermal erosion at high temperatures.