THE STABILITY OF SEGMENTED POLYURETHANES - STRUCTURE DEVELOPMENT ON CONTACT WITH BLOOD

The segmented polyurethanes (SPU) of Vitur-RM trademark are widely use d thrombosis resistant SPUs. The changes in the structure of their col loid level sizes and in stability characteristics were studied after i ncubation of SPU films in blood serum for a period of 1-2 years at 40 degrees C. The small-angle X-ray scattering using linear coordination detector showed that the domain sizes did not change noticeably on inc ubations. The strength characteristics decreased by not more than by 1 0-15% during this of exposure. The characteristics investigated differ ed markedly from those found with samples with initially low strength, corresponding to the lowest limit of the Russian standard.