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

Abstract

A novel monobenzoxazine having two propargyl groups in one molecule was synthesized from a dihydroxyaromatic compound as a raw material. In a dynamic viscoelasticity test, the glass transition point (T_g) of this cured resin exceeding 350 ℃. A thermogravimetry test yielded excellent thermal decomposition resistance. The cured resin therefor exhibits excellent physical and chemical properties required by a next generation power device. High levels of chemical and physical heat resistance were confirmed. In addition, this cured product maintained low a coefficient of thermal expansion and high modulus of elasticity over a wide temperature range. The reasons for the excellent properties of the novel benzoxazine having a propargyl group were examined by investigating the reaction behavior using the model substance and analyzing the composition of the pyrolysis gas.