Effects of types of polyols on thermal degradation behaviors of poly(benzoxazine-urethane) alloys

Abstract In this work, thermal stability of alloys of polybenzoxazine (PBA-a) / polyurethane (PU) which show unique shape memory properties has been investigated. This study aims to confirm the thermal stability under cyclic heat activation in shape memory performance. Thermal degradation kinetics of the system is evaluated as this behaviour has not been studied before. The degradation temperatures of the obtained alloys were determined by Thermogravimetric Analyzer (TGA) with various heating rates of 15, 20 and 25°C/min. Polybenzoxazine and polyurethane alloys at weight ratios of 80:20, 70:30 and 60:40 were examined.