Structure, viscosity and fibre drawing properties of phosphate-based glasses: effect of boron and iron oxide addition

Abstract

Resorbable phosphate based glasses have been applied as fibrous reinforcement for resorbable polymers for fracture fixation. The mechanical properties of these composites largely depend on the mechanical properties of the fibres. In this current study, four phosphate based glass compositions were produced by replacing Na2O with B2O3 and/or Fe2O3 in the glass system P2O5-CaO-Na2O-MgO, and the P2O5 content was fixed at 45 mol%. The thermal stability of the glasses containing both B2O3 and Fe2O3 and/or FeO (P45B5Fe5 and P45B5Fe3) was significantly higher than the only B2O3 (P45B5) or Fe2O3 (P45Fe3 and P45Fe5) containing glasses. The viscosity was found to shift to higher temperature with increasing B2O3 and Fe2O3 and/or FeO content. The fragility parameter, m and F1/2, estimated from the viscosity curve, decreases with B2O3 addition. The improved physical properties of the glasses investigated with B2O3 and Fe2O3 and/or FeO addition were attributed to the replacement of P-O-P bonds with P-O-B and P-O-Fe bonds. The presence of P-O-B and P-O-Fe bonds in the glass structure was confirmed by the FTIR analysis. It was possible to draw continuous fibres up to 3 hours from the B2O3 or Fe2O3 and/or FeO containing glasses, whereas it was difficult to pull fibre from only Fe2O3 containing glasses and the fibre pulling process was not continuous. Therefore, addition of B2O3 to the glass system enabled successful drawing of continuous fibres from glasses with phosphate (P2O5) contents of 45 mol%. It was also observed that addition of only Fe2O3 and/or FeO did not have a significant effect on the fibre mechanical properties, whilst the mechanical properties of the fibres increased with increasing B2O3.

Chitosan as a Coupling Agent for Phosphate Glass Fibre/Polycaprolactone Composites

“…The normalising stress and Weibull modulus are referred to as the scale and shape parameters, respectively. The normalising stress describes the most probable stress at which Fibers 2018, 6, 97 4 of 25 a brittle fibre of the gauge length will fail [26]. Minitab 17 (Minitab Inc., State College, PA, USA) was used to calculate Weibull parameters from the tensile strength data.…”

In vitro cellular testing of strontium/calcium substituted phosphate glass discs and microspheres shows potential for bone regeneration

“…The ability to control their dissolution rates, and thus the release of ions, serves as a highly attractive route to direct the biological response for the repair and regeneration of both hard and soft tissues (Hoppe, Guldal, & Boccaccini, ). Furthermore, the geometry of PBG can be varied by means of fibre drawing (Ahmed, Collins, Lewis, Olsen, & Knowles, ; Sharmin, Rudd, Parsons, & Ahmed, ), scaffold production (Jones et al, ), and microsphere manufacture (Jones et al, ; Lakhkar et al, ), making them an extremely versatile and tuneable material.…”

Thermal and crystallization kinetics of yttrium‐doped phosphate‐based glasses

“…Phosphate‐based glasses have been widely investigated for biomedical applications and can provide highly useful properties such as low glass transition and melting temperatures, high thermal expansion coefficients, biocompatibility, high refractive indices and one of their most unique offerings is their controlled dissolution properties . The structural, chemical, and physical durability of phosphate glasses has been shown to be improved by the inclusion of several oxide additions such as ZnO, Fe 2 O 3 , Y 2 O 3 , Al 2 O 3 , TiO 2 and Bi 2 O 3 …”