PHO-diol, PHO-hexyl and two conventional phthalates (DPHP and DIDP). The Tg of the polymers were significantly reduced, giving the material greater flexibility. Plasticizing effects similar to those of classically used phthalates were obtained with PHO-hexyl. The alkyl chain ends of PHO-hexyl enabled better dispersion of the additives in the matrices, as well as an increase in free volume, which was reflected in further improvement of the thermal and mechanical parameters compared to PHO-diol.