Rigid, tough thermoplastic polyurethanes were synthesized by a two-step technique. These materials presented a complex structure consisting of a continuous, rigid, amorphous, or semicrystalline matrix with a dispersed soft phase. The influence of soft-segment content upon rigidity modulus, heat-distortion temperature, and fracture behavior has been determined on model amorphous polyurethanes. The influence of crystallinity upon final properties has 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. Phase structure was characterized by differential scanning calorimetry and wide-angle X-ray scattering. Some of the polyurethane samples assayed in this paper exhibited similar properties to those reported in respect of more conventional engineering thermoplastics, such as ABS or nylon.

Development of polyurethane engineering thermoplastics. II. Structure and properties

RINK SUGAR, MARTA ELISABETH;PAVAN, ANDREA
1993

Abstract

Rigid, tough thermoplastic polyurethanes were synthesized by a two-step technique. These materials presented a complex structure consisting of a continuous, rigid, amorphous, or semicrystalline matrix with a dispersed soft phase. The influence of soft-segment content upon rigidity modulus, heat-distortion temperature, and fracture behavior has been determined on model amorphous polyurethanes. The influence of crystallinity upon final properties has 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. Phase structure was characterized by differential scanning calorimetry and wide-angle X-ray scattering. Some of the polyurethane samples assayed in this paper exhibited similar properties to those reported in respect of more conventional engineering thermoplastics, such as ABS or nylon.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11311/661760
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