Reaction of Polyethyleneterephthalate Prepolymers with Diisocyanates

Abstract

Seventeen kinds of polyesterurethanes were prepared from hydroxyl-end polyethyleneterephthlate prepolymers (ETP) and diisocyanates by polyaddition reaction, and some of their properties were measured. Polymers were white powder which have fiber forming property. These polyesterurethanes had higher solubility and lower melting points than ETP. Melting points of polyesterurethanes were affected by urethane group and high crystallinity of ETP, and these effects on the melting points were depended upon the molecular weight of ETP. When ETP (M_w1320) was used, melting points of polyesterurethanes were affected with the urethane group and kinds of diisocyanates. When ETP (M_w2710) was used, melting points were more affected with the high crystallinity of ETP than with kinds of diisocyanates.