Synthesis of Novel Benzoxazines Having Propargyl Groups and Verification of Thermal Decomposition of Cured Products, Second Report

Abstract

The novel monobenzoxazines having two propargyl groups were synthesized from various dihydroxyaromatics compound. In a dynamic viscoelasticity test, the glass transition temperatures (T_g) of the cured resin exceeded 350 ° C. In a thermogravimetry test excellent thermal decomposition resistance was observed. The cured resin therefor exhibits excellent physical and chemical properties required by next generation power devices. High levels of chemical and physical heat resistance were confirmed. In addition, this cured product maintained high modulus of elasticity over a wide temperature range. The reasons for the excellent properties of the novel benzoxazine having a propargyl group were considered by examining the relationship between the structure of various dihydroxyaromatics as raw materials and the calculation result of activation energy of bond cleavage of the model structure of each cured product.