title: Biocompatible polyurethane/thiacalix[4]arenes functionalized Fe3O4 magnetic nanocomposites: Synthesis and properties.
abstract: In this study, a series of magnetic polyurethane/Fe3O4 elastomer nanocomposites were prepared by covalently embedding novel thiacalix[4]arenes (TC4As) functionalized Fe3O4 nanoparticles (TC4As-Fe3O4) which contain macrocycles with reactive hydroxyl groups. Surface functionalization of Fe3O4 nanoparticles with TC4As macrocycles as unique reactive surface modifier not only gives specific characteristics to Fe3O4 nanoparticles but also improves the interphase interaction between nanoparticles and the polyurethane matrices through covalent attachment of polymer chains to nanoparticle surfaces. The novel synthesized TC4As-Fe3O4 nanoparticles were characterized by FTIR, XRD, TGA, VSM and SEM analysis. Furthermore, the effect of functionalization of Fe3O4 nanoparticles on the various properties of resulting nanocomposites was studied by XRD, TGA, DMTA, SEM, and a universal tensile tester. It was found that the functionalization of nanoparticles with TC4As affords better mechanical and thermal properties to polyurethane nanocomposites in comparison with unmodified nanoparticles. The SEM analysis showed finer dispersion of TC4As-Fe3O4 nanoparticles than unmodified Fe3O4 nanoparticles within the polyurethane matrices, which arising from formation of covalent bonding between TC4As functionalized Fe3O4 nanoparticles and polyurethane matrices. Moreover, the investigation of in vitro biocompatibility of novel nanocomposites showed that these samples are excellent candidate for biomedical use.
authors.affiliation: Department of Polymer Chemistry, University of Mazanadaran, P.O. Box 47416, Babolsar, Iran.
authors.forename: Abbas
authors.initials: A
authors.lastname: Mohammadi
authors.affiliation: Department of Polyurethane, Iran Polymers and Petrochemicals Institute, P.O. Box 14965-115, Tehran, Iran. Electronic address: M.Barikani@ippi.ac.ir.
authors.forename: Mehdi
authors.initials: M
authors.lastname: Barikani
authors.affiliation: Department of Polymer Chemistry, University of Mazanadaran, P.O. Box 47416, Babolsar, Iran.
authors.forename: Moslem Mansour
authors.initials: MM
authors.lastname: Lakouraj
mesh_terms: D052203:Ferrosoferric Oxide / Q000737:chemistry*; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D010316:Particle Size; D010636:Phenols / Q000737:chemistry*; D011140:Polyurethanes / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013440:Sulfides / Q000737:chemistry*; D013499:Surface Properties; D013718:Tensile Strength; D013818:Thermogravimetry; D017155:Wettability; D014961:X-Ray Diffraction
chemical_list: D058185:Magnetite Nanoparticles; D010636:Phenols; D011140:Polyurethanes; D013440:Sulfides; C500450:thiacalix(4)arene; D052203:Ferrosoferric Oxide
keywords: Biocompatible polyurethane nanocomposites; Magnetic nanostructures; Surface functionalization; Thermo-mechanical properties; Thiacalix[4]arens