Effect of the chemical structure of the rigid block on the properties of polyester urethane urea elastomers

Abstract

A thermomechanical analysis has been made of polyester urethane ureas with non-crystallizable rigid blocks and an amorphous flexible matrix. The glass transition temperature, the devitrification interval and the compression modulus depending on the degree of phase separation are regulated not only by change in the solubility parameter of the rigid block but also by the number and position of the “hinge” groups in it. The behaviour of the polyester urethane urea elastomers at high temperatures is determined by the same factors and also by the polarity of the rigid block reflected in the temperature of the onset of devitrification of the rigid phase and the interval of its devitrification which in the end determines the performance of polyester urethane urea elastomers at high temperatures.