title: Grafting of PEO to glass, nitinol, and pyrolytic carbon surfaces by gamma irradiation.
abstract: Glass, nitinol, and pyrolytic carbon surfaces were grafted with poly (ethylene oxide) (PEO) and PEO-containing Pluronic surfactants by gamma irradiation. These substrates were coated with a primer layer of trichlorovinylsilane (TCVS), which allows grafting of organic polymers. The TCVS-coated substrates were adsorbed with PEO or Pluronics and exposed to 0.3 Mrad of gamma radiation to graft the polymer to the surface. PEO-grafted substrates were characterized by contact angle measurement, X-ray photoelectron spectroscopy, fibrinogen adsorption, and platelet adhesion and activation. Surface modification with PEO reduced fibrinogen adsorption by as much as 99%. Platelet adhesion was significnatly reduced or prevented on the modified surfaces. Protein- and platelet-resistance effects were independent of hydrophilicity of the PEO-grafted surfaces. Polymer grafting by gamma radiation to TCVS-coated substrates provides a facile process to improve thromboresistance of inorganic biomaterials.
authors.affiliation: Purdue University, West Lafayette, Indiana, USA.
authors.forename: T B
authors.initials: TB
authors.lastname: McPherson
authors.forename: H S
authors.initials: HS
authors.lastname: Shim
authors.forename: K
authors.initials: K
authors.lastname: Park
mesh_terms: D000497:Alloys; D001672:Biocompatible Materials; D001792:Blood Platelets; D002244:Carbon; D005340:Fibrinogen; D005720:Gamma Rays; D005898:Glass; D006801:Humans; D010973:Platelet Adhesiveness; D011092:Polyethylene Glycols
chemical_list: D000497:Alloys; D001672:Biocompatible Materials; C009139:pyrolytic carbon; C013616:nitinol; D011092:Polyethylene Glycols; D002244:Carbon; D005340:Fibrinogen