Kinetic Aspects of Hydrolytic Resistance of Avtocan and Biomer Segmented Polyurethanes

摘要

Degradation of film samples,representing of segmented polyesterurethanes(Avcotan and Biomer)in water and acidic solutions (acidic phosphastes)was investigated.We found,that Avcotan,representing copolymers of segmented polyurethanes with polydimethyl-sioxane,degradated in water with noticeable rate,whereas Biomer samples were found hydrolytically stable.It was shown,that degradation from Avcotan sample surface was stipulated by decompostiion of siloxane component as a result of hydrolysis.The values of decomposition rate constant,allow us to predict the duration of degradation for sur-face layers of polyesterurethanes(Avcotan),responsible for thromboresistance.