SYNTHESIS OF AN ARYL ETHER KETONE CONTAINING POLYBENZOXAZINE

摘要

Thermoset networks, such as epoxide-amines and polybenzoxazines, typically display brittle behavior as a result of their rigid backbones limiting sub-glass transition temperature (T_g) relaxations of the polymer network. Methods to decrease the brittleness and increase the toughness of aerospace-grade thermoset networks traditionally include the incorporation of aliphatic curatives, rubbers, or thermoplastics. However, these methods often reduce the ultimate T_g of the system and increase network heterogeneity. Alternatively, integrating thermoplastic moieties, specifically polyaryletherketone moieties, into the backbone of a polymer network is an effective approach to increase the toughness of a polymer network while simultaneously minimizing the reduction of ultimate T_g and eliminating network heterogeneity. This research incorporates aryl ether ketone (AEK) backbones into polybenzoxazine networks to increase network strain-absorbing and energy-dissipating mechanisms. Herein, an AEK containing benzoxazine monomer was synthesized, and monomer synthesis is confirmed via proton nuclear magnetic spectroscopy. Differential scanning calorimetry is used to further prove monomer purity, endothermic melting, and determine the onset and peak polymerization temperatures. Dynamic mechanical analysis is employed to quantify the T_g and glassy storage modulus of the AEK containing polybenzoxazine network. Thermogravimetric analysis is utilized to determine the thermal stability and char yield of the AEK monomer and the cured polybenzoxazine network. This work demonstrates the successful synthesis and thermomechanical characterization of an AEK containing polybenzoxazine.