Plasma Modification of Surface Wettability and Morphology for Optimization of the Interactions Involved in Blood Constituents Spreading on Some Novel Copolyimide Films

Novel copolyimides (cPIs) based on 3,3??,4,4??-benzophenonetetracarboxylic dianhydride, 4,4??-diaminodiphenylmethane (DDM) and 1,6-diaminohexane (DAH) were synthesized. Their surface wettability was improved by plasma enhancement of polar component contribution to surface tension from 10 to 50?%. Interfacial energy reduction up to 2.07?C2.95?mN/m was depicted in spreading work values that reveal the manner in which cPIs interact with blood constituents. The results showed that by increasing of the aliphatic DAH content in the polymer chain, the rejection of platelets is higher, prohibiting thrombosis and favoring cohesion with plasma proteins. The different water sorptions of the samples were evaluated by considering their morphologies and chemical affinities to water. When DAH prevails to DDM, water sorption capacity is lowered from 6.36 to 4.96?%?db, presumably due to a higher chain packing efficiency. Atomic force microscopy data revealed that surface roughness is <8?nm for all polymers, even after plasma treatment, preventing clot formation.