Influence of Catalyst Addition and Curing Time on Rheological Behavior and Mechanical Properties of Highly Filled Polyurethane Composites

In the present work, three formulations of highly filled composites based on polyurethane with different amounts of catalyst were prepared and cured for four time intervals of 7, 10, 14, 21 days. Rheological measurements showed that the viscosity of the slurry increased faster with time for samples with higher catalyst level. Tensile tests revealed that the modulus of the samples increased with catalyst content, too. In addition, the obtained data showed that the relationship between the amounts of catalyst and modulus or viscosity value of the samples was not linear. There is an optimum curing time of 10 days for all the samples in which the samples gain approximately maximum modulus.

کلیدواژه ها:

Polyurethane ، Curing Catalyst ، Highly Filled Composite ، Rheological Behavior ، Mechanical Properties