title: Fabrication of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) biocomposites with reinforcement by hydroxyapatite using extrusion processing.
abstract: The aim of this study was to prepare poly(3-hydroxybutyrate-co-3-hydroxyvalerate), PHBV, biocomposites with incorporating various percentages of hydroxyapatite (HAP) using extrusion processing. The biocomposites were produced by melt extrusion of PHBV with untreated HAP and surface-treated HAP crystals. The structure of biopolymer/HAP biocomposites was investigated by XRD, FTIR, DSC and SEM. Silane coupling agent was used for HAP surface treatment in PHBV/HAP composites. Silane-treated HAP nanoparticles yielded nanocomposites characterized by good mechanical performance and fine nanofiller dispersion, as shown by SEM investigations. The Halpin-Tsai and Hui-Shia models were used to evaluate the effect of reinforcement by HAP particles on the elastic modulus of the composites. Micromechanical models for initial composite stiffness showed good correlation with experimental values. Disparities in the Halpin-Tsai model were evident for composite with higher HAP loadings.
authors.affiliation: Yildiz Technical University, Chemical Engineering Department, Davutpasa Campus, 34210 Esenler, İstanbul, Turkey.
authors.forename: Mualla
authors.initials: M
authors.lastname: Öner
authors.affiliation: Yildiz Technical University, Chemical Engineering Department, Davutpasa Campus, 34210 Esenler, İstanbul, Turkey.
authors.forename: Berna
authors.initials: B
authors.lastname: İlhan
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D002152:Calorimetry, Differential Scanning; D017886:Durapatite / Q000737:chemistry*; D055119:Elastic Modulus; D008855:Microscopy, Electron, Scanning; D053761:Nanocomposites / Q000737:chemistry; D011091:Polyesters / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D000094122:Polyhydroxybutyrates
chemical_list: D001672:Biocompatible Materials; D017886:Durapatite; D011091:Polyesters; C052620:poly(3-hydroxybutyrate)-co-(3-hydroxyvalerate); D000094122:Polyhydroxybutyrates
keywords: Bionanocomposite; Hydroxyapatite; Mechanical properties; Poly(3-hydroxybutyrate-co-3-hydroxyvalerate); Thermal properties