Preparation and properties evaluation of nonisocyanate condensation polyurethanes based on phenol sulfonic and hydroxybenzoic acids

Abstract

The present work investigates the preparation of nonisocyanate polyurethane through condensation of oligomeric hard segments produced by using phenol sulfonic and hydroxybenzoic acids and soft segments obtained by transesterification reaction of polyoxypropylene glycol with ethyl urethane. Obtained nonisocyanate polyurethane films with different hard segments content were tested for their mechanical, physical and thermal properties. Polyurethane films containing p-hydroxybenzoic acid exhibited enhanced tensile strength and water resistance. The tensile strength increased by approximately 230% and water resistance by 35% with the addition of 30% p-hydroxybenzoic acid. Differential scanning calorimetry analysis confirmed the formation of segmented structures within the prepared condensation nonisocyanate polyurethane-based films. Moreover, Fourier transform infrared spectroscopy results analysis confirmed the chemical structure of condensation polyurethanes with characteristic groups of typical conventional polyurethanes.