Extensional Mechanical Properties of Polyester and Polyether Based Polyurethanes

摘要

An investigation of the extensional mechanical properties of a polyester based polyurethane and a polyether based polyurethane is described. Dynamic steady-state tests were performed over a frequency range of 1000 to 8000 cps and a temperature range of 50 to 110F for the polyester material held at a constant elongation of 105%. The experiments on the polyether were conducted at 110% initial elongation over a range of frequency of 200 to 1600 cps, and a temperature range of 50 to 110F. The complex modulus is found for both materials and the reduced variable concept applied. Master curves for the moduli are determined for a reference temperature of 510R (50F). Relaxation tests were performed on the same materials and the relaxation modulus determined. The relaxation spectrum is determined by using the data from the dynamic and relaxation experiments. (Author)