Immobilized Heparin onto TiNi Shape Memory Alloy Modified with Acrylamide by UV-Induced Grafting

Abstract

SiC:H organic-like thin films are deposited on Ti₅₀Ni₅₀ shape memory alloy by DC-pulsed plasma enhanced chemical vapor deposition (PECVD) in the gas mixture of Hexamethyldisilazane (HMDSN) and Ar at room temperature. The organic-like thin films containing peroxides or free radicals can be successfully grafted with hydrophilic polymer acrylamide (AAm) by UV-induced grafting polymerization. After grafting, a new dense organic and slippery surface with low friction coefficient is obtained. Heparin is finally immobilized onto grafted-AAm thin films to take TiNi SMA into the anti-thrombin biomaterials.