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- Title
Structure, viscosity and fibre drawing properties of phosphate-based glasses: effect of boron and iron oxide addition.
- Authors
Sharmin, Nusrat; Rudd, Chris; Parsons, Andrew; Ahmed, Ifty
- 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 NaO with BO and/or FeO in the glass system PO-CaO-NaO-MgO, and the PO content was fixed at 45 mol%. The thermal stability of the glasses containing both BO and FeO and/or FeO (P45B5Fe5 and P45B5Fe3) was significantly higher than that of the only BO (P45B5)- or FeO (P45Fe3 and P45Fe5)-containing glasses. The viscosity was found to shift to higher temperature with increasing BO and FeO and/or FeO content. The fragility parameters, m and F, estimated from the viscosity curve, decrease with BO addition. The improved physical properties of the glasses investigated with BO and FeO 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 h from the BO- or FeO- and/or FeO-containing glasses, whereas it was difficult to pull fibre from only FeO-containing glasses and the fibre pulling process was not continuous. Therefore, addition of BO to the glass system enabled successful drawing of continuous fibres from glasses with phosphate (PO) contents of 45 mol%. It was also observed that addition of only FeO and/or FeO did not have a significant effect on the fibre mechanical properties, whilst the mechanical properties of the fibres increased with increasing BO.
- Subjects
PHOSPHATE glass; CRYSTAL structure; VISCOSITY; FIBERS; BORON; IRON oxides; ADDITION reactions
- Publication
Journal of Materials Science, 2016, Vol 51, Issue 16, p7523
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-016-0032-3