BIOARTIFICIAL MATERIALS BASED ON COLLAGEN .2. MIXTURES OF SOLUBLE COLLAGEN AND POLY(VINYLALCOHOL) CROSS-LINKED WITH GASEOUS GLUTARALDEHYDE

Thin films of both pure soluble collagen (CLG) and poly(vinylalcohol) (PVA) and mixtures of the two, ranging from 20-80% PVA composition wer e studied to test the effects of PVA content and of glutaraldehyde vap our cross-linking. Both the thermal and mechanical behavior and, in ad dition, proteolytic stability were clearly influenced by the ratio of CLG/PVA. The experimental results indicate that no thermodynamic compa tibility occurs between the two homopolymers. However, there is eviden ce that strong interactions, probably due to hydrogen bond formation, occur between the biological and synthetic polymers. The interactions appear stronger in those films with a lower PVA content and which were not cross-linked. Both the thermal and biological stability are incre ased and there is an improvement of the mechanical properties. The mut ual intermolecular influence appears to allow the attainment of a good mechanical compatibility between CLG and PVA.