title: Surface-initiated ATRP of HEA from nanocrystal alpha-Fe2O3 under ultrasonic irradiation.
abstract: Core/shell poly(beta-hydroethyl acrylate) (PHEA) encapsulated nanocrystal alpha-Fe2O3 nanospheres (Fe2O3@PHEA) were successfully prepared by the surface-initiated atom transfer radical polymerization (SI-ATRP) of beta-hydroethyl acrylate (HEA), a functional monomer, from the surfaces of the nanocrystal Fe2O3 modified with bromo-acetamide groups with the catalysts of 1,10-phenanthroline and Cu(I)Br under ultrasonic irradiation at room temperature in water. The products, Fe2O3@PHEA, were characterized by elemental analysis (EA), FT-IR, XRD, XPS and TEM. The percentage of grafting (PG%) of 38.95% and the conversion of HEA (C%) of 14.29% at room temperature for 6 h with ultrasonic irradiation were higher than the 22.41% and 8.22%, respectively, found for samples prepared by electromagnetic stirring. This demonstrated that the ultrasonic irradiation improves the SI-ATRP of HEA.
authors.affiliation: Institute of Polymer Science and Engineering, College of Chemistry and Chemical Engineering, Lanzhou University, China.
authors.forename: Peng
authors.initials: P
authors.lastname: Liu
authors.forename: Liuxue
authors.initials: L
authors.lastname: Zhang
authors.forename: Zhixing
authors.initials: Z
authors.lastname: Su
mesh_terms: D000179:Acrylates / Q000032:analysis / Q000737:chemistry*; D020099:Coated Materials, Biocompatible / Q000032:analysis / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D005290:Ferric Compounds / Q000032:analysis / Q000737:chemistry* / Q000528:radiation effects; D008422:Materials Testing; D049329:Nanostructures / Q000032:analysis / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods; D010316:Particle Size; D013010:Sonication; D013499:Surface Properties
chemical_list: D000179:Acrylates; D020099:Coated Materials, Biocompatible; D005290:Ferric Compounds; C000499:ferric oxide