Polyvinylidene fluoride – Hydroxyapatite 0–3 biocomposite filaments processed by twin-screw extrusion. (January 2022)

• Record Type: Journal Article
• Authors: Silva, L.E.J.; Volnistem, E.A.; Dias, G.S.; Cótica, L.F.; Santos, I.A.; Fiorentin, E.R.; de Oliveira, M.A.; Witchemichen, D.H.; Freitas, V.F.; Bonadio, T.G.M.
• Is Part Of: Journal of the mechanical behavior of biomedical materials. Volume 125(2022)
• Publication Date: 2022-01
• Subjects: PVDF -- Biocomposites -- FDM -- TSE -- Hydroxyapatite; Biomedical materials -- Periodicals; Biomedical materials -- Mechanical properties -- Periodicals; Biomedical materials; Biomedical materials -- Mechanical properties; Periodicals; Electronic journals; 610.28
• DOI: 10.1016/j.jmbbm.2021.104891
• Languages: English
• ISSNs: 1751-6161

Abstract

Abstract: Polyvinylidene fluoride – hydroxyapatite composite filaments were processed by twin-screw extrusion at different processing angular velocities and characterized by scanning electron and atomic force microscopies, differential scanning calorimetry and tensile tests. Polymer-ceramic composites with a 0–3 connectivity were successfully obtained. Regardless of the used processing parameters, all composite filaments present very similar melting (∼152°C) and solidification (∼139°C) points and elastic moduli (∼1.0 GPa) for hydroxyapatite as dispersed phase in the composite with concentrations up to 25 wt%, indicating that they are adequate for twin-screw extrusion and 3D printing. However, the yield strength (∼29 MPa), ultimate tensile strength (∼36 MPa) and tensile point (∼29 MPa) parameters are similar only for hydroxyapatite concentrations up to 15 wt%, once higher concentrations of hydroxyapatite as dispersed phase result in fragile samples (∼50% lower for each studied property). Highlights: Polyvinylidene fluoride – hydroxyapatite composite filaments successfully processed by twin-screw extrusion. All filaments are adequate for to be used in additive manufacturing applications in fusing deposition modeling approaches. The filaments show similar melting (∼152 °C) and solidification temperatures (∼139 °C), elastic moduli (~1 GPa).