Abstract
In this literature, we report preparation and characterization of novel polymer alloy which has both high heat resistant and low CTE. This alloy was prepared by melt mixing of two resins, Bismaleimide diphenyl methan(BMI) and 3,3'-(methylen-1,4-diphenylen)bis(3,4-dihydro-2H-1,3-benzoxazine) (P-d), and cured only 200°C/4h.The optimum molar ratio was examined from the view point of mechanical properties at the high temperature by using DVA, TGA and TMA. As a result polybenzyoxazine modified bismaleimide alloys showed higher Tg than each independent neat resin. This phenomenon suggests interaction between BMI and P-d and we try to analyze this by using monofunctional compounds. The resin consisting of BMI 1.0 vs. P-d 0.3 showed the most superior thermal properties with processability. This resin has Tg of 310°C, Td10 of over 400°C and CTE of 48ppm/K which is lower than conventional epoxy resins 70ppm/K. DSC results suggest the reaction between BMI and P-d. The reactivity between phenolic hydroxyl group and double bond of maleimide was confi rmed by model reaction using phenol, N-phenyl maleimide and accelerator. And the reactivity between Mannich hydroxyl group of poly benzoxazine and double bond of bismaleimide was suggested.
