title: Preparation and applications of a variety of fluoroalkyl end-capped oligomer/hydroxyapatite composites.
abstract: A variety of fluoroalkyl end-capped oligomers were applied to the preparation of fluorinated oligomer/hydroxyapatite (HAp) composites (particle size: 38-356 nm), which exhibit a good dispersibility in water and traditional organic solvents. These fluoroalkyl end-capped oligomer/HAp composites were easily prepared by the reactions of disodium hydrogen phosphate and calcium chloride in the presence of self-assembled molecular aggregates formed by fluoroalkyl end-capped oligomers in aqueous solutions. In these fluorinated HAp composites thus obtained, fluoroalkyl end-capped acrylic acid oligomers and 2-methacryloyloxyethanesulfonic acid oligomer/HAp nanocomposites afforded transparent colorless solutions toward water; however, fluoroalkyl end-capped N,N-dimethylacrylamide oligomer and acryloylmorpholine oligomer were found to afford transparent colorless solutions with trace amounts of white-colored HAp precipitants under similar conditions. HAp could be encapsulated more effectively into fluorinated 2-methacryloyloxyethanesulfonic acid oligomeric aggregate cores to afford colloidal stable fluorinated oligomer/HAp composites, compared to that of fluorinated acrylic acid oligomers. These fluorinated oligomer/HAp composites were applied to the surface modification of glass and PVA to exhibit a good oleophobicity imparted by fluorine. HAp formation was newly observed on the modified polyethylene terephthalate film surface treated with fluorinated 2-methacryloyloxyethanesulfonic acid oligomers and acrylic acid oligomer/HAp composites by soaking these films into the simulated body fluid.
authors.affiliation: Department of Frontier Materials Chemistry, Graduate School of Science and Technology, Hirosaki University, Bunkyo-cho, Hirosaki 036-8561, Japan.
authors.forename: Hiroki
authors.initials: H
authors.lastname: Takashima
authors.forename: Ken-Ichi
authors.initials: K
authors.lastname: Iwaki
authors.forename: Rika
authors.initials: R
authors.lastname: Furukuwa
authors.forename: Katsuhisa
authors.initials: K
authors.lastname: Takishita
authors.forename: Hideo
authors.initials: H
authors.lastname: Sawada
mesh_terms: D017886:Durapatite / Q000737:chemistry*; D006845:Hydrocarbons, Fluorinated / Q000737:chemistry*; D011095:Polyethylenes / Q000737:chemistry; D013499:Surface Properties
chemical_list: D006845:Hydrocarbons, Fluorinated; D011095:Polyethylenes; D017886:Durapatite