s-Triazine-based functional monomers with thermocrosslinkable propargyl units: Synthesis and conversion to the heat-resistant polymers

Three s-triazine-based functional monomers with thermo-polymerizable propargyl-ether units were synthesized by a facile procedure. These monomers can be thermally cured to form the crosslinked networks, which showed 5-wt% loss temperature of up to 400 °C and the char yields of more than 50% at 1000 °C. Moreover, the crosslinked networks exhibited the coefficients of thermal expansion (CTE) of below 43 ppm °C−1 varying from 30 to 300 °C and glass transition temperatures (Tg) of up to 290 °C, respectively. These monomers were also used to improve the thermostability of a commercial bismaleimide (4,4′-bismaleimidodiphenylmethane). The results indicated that blending the bismaleimide and the triazine monomers gave the new resins, which showed higher Tg and lower CTE than the bismaleimide, suggesting the triazine monomers can be considered as the modifiers for enhancement of the thermostability of the commercial bismaleimides. s-Triazine-based functional monomers with thermo-polymerizable propargyl-ether units are reported here. Thermopolymerization of the monomers gave the crosslinked networks, showing high low coefficients of thermal expansion (CTE) high glass transition temperatures (Tg). These monomers were also used to improve the properties of a commercial bismaleimide, producing the copolymers with the better thermostability than that the neat bismaleimide. [Display omitted]