Development of Polyurethane Engineering Thermoplastics. II. Structure and Properties

P. M. FRONTINI,; M. RINK; A. PAVAN

JOURNAL OF APPLIED POLYMER SCIENCE

JOHN WILEY & SONS INC

Lugar: New York; Año: 1993 p. 2023 - 2032

0021-8995

Rigid, tough thermoplastic polyurethanes were synthesized by a two-step technique. Thesematerials presented a complex structure consisting of a continuous, rigid, amorphous, orsemicrystalline matrix with a dispersed soft phase. The influence of soft-segment contentupon rigidity modulus, heat-distortion temperature, and fracture behavior has been determinedon model amorphous polyurethanes. The influence of crystallinity upon final propertieshas been studied on two materials: a preparation of ours and a commercial product.Various degrees of crystallinity have been induced in the samples by annealing. Phasestructure was characterized by differential scanning calorimetry and wide-angle X-ray scattering.Some of the polyurethane samples assayed in this paper exhibited similar propertiesto those reported in respect of more conventional engineering thermoplastics, such as ABSor nylon.