Effect of processing on the thermal stability of the blends based on polyurethane: Part IV

Blends of a polyurethane with two different functionally reactive elastomer s have been prepared by two different blending techniques. The thermal stab ility of the blends was studied to correlate the effect of blending techniq ue on the degradation temperatures of the blends. The blending technique pl ays an important role in determining the thermal stability of the blends. F or the same elastomer ratio, the preblended sample degraded at a lower temp erature and the degradation temperatures for the preheated preblended sampl es were delayed. This may be due to the interchain crosslinking reaction be tween the two elastomers on heat treatment. (C) 2001 Elsevier Science Ltd. All rights reserved.