title: Characterization of bioactive glass-reinforced HAP-polymer composites.
abstract: The effect of bioactive glass on the mechanical properties of hydroxyapatite-Ca polyacrylate composites was studied. Powder mixtures of tetracalcium phosphate (TetCP), poly(acrylic-co-itaconic) and bioactive glass (up to 50% by weight) were hot pressed for 30 min at 300 degrees C and 40 kpsi. Tensile strengths, elastic moduli, and microstructures of the composites produced were investigated. Results showed the mechanical properties of these composites were enhanced by the addition of bioactive glass. The highest values of tensile strength and elastic modulus were achieved with the addition of 10% bioactive glass. Composites were immersed in SBF for up to 10 days, then in 1.5 simulated body fluid (SBF) for a week. The changes in the concentrations of Ca, P, and Si ions of these solutions were measured. The microstructures of these composites after SBF immersion were also evaluated. Concentrations of Ca, P, and Si increased with the time of immersion in SBF owing to the formation of an apatite layer on their surfaces as found by SEM with energy-dispersive spectroscopy attachment.
authors.affiliation: Intercollege Materials Research Laboratory, Room 136, Pennsylvania State University, University Park, Pennsylvania 16802, USA.
authors.forename: Y E
authors.initials: YE
authors.lastname: Greish
authors.forename: P W
authors.initials: PW
authors.lastname: Brown
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D001826:Body Fluids; D002118:Calcium / Q000032:analysis; D002130:Calcium Phosphates / Q000737:chemistry*; D017886:Durapatite / Q000138:chemical synthesis / Q000737:chemistry; D004548:Elasticity; D005898:Glass / Q000737:chemistry*; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D009994:Osmolar Concentration; D010316:Particle Size; D010758:Phosphorus / Q000032:analysis; D011091:Polyesters / Q000138:chemical synthesis / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D017640:Silicates / Q000032:analysis; D012996:Solutions; D013057:Spectrum Analysis; D013499:Surface Properties; D013718:Tensile Strength; D014965:X-Rays
chemical_list: D001672:Biocompatible Materials; D002130:Calcium Phosphates; D011091:Polyesters; D011108:Polymers; D017640:Silicates; D012996:Solutions; C485828:alpha-tricalcium phosphate; C120461:sodium oxide-calcium oxide-silicon dioxide-diphosphorus pentoxide; C485830:tetracalcium phosphate; C008219:itaconic-acrylic acid copolymer; D010758:Phosphorus; C485838:calcium phosphate, monobasic, anhydrous; D017886:Durapatite; C020243:calcium phosphate; C485829:calcium phosphate, dibasic, anhydrous; D002118:Calcium