title: Effect of boron oxide addition on fibre drawing, mechanical properties and dissolution behaviour of phosphate-based glass fibres with fixed 40, 45 and 50 mol% P2O5.
abstract: Previous studies investigating manufacture of phosphate-based glass fibres from glasses fixed with P2O5 content less than 50 mol% showed that continuous manufacture without breakage was very difficult. In this study, nine phosphate-based glass formulations from the system P2O5-CaO-Na2O-MgO-B2O3 were prepared with P2O5 contents fixed at 40, 45 and 50 mol%, where Na2O was replaced by 5 and 10 mol% B2O3 and MgO and CaO were fixed to 24 and 16 mol%, respectively. The effect of B2O3 addition on the fibre drawing, fibre mechanical properties and dissolution behaviour was investigated. It was found that addition of 5 and 10 mol% B2O3 enabled successful drawing of continuous fibres from glasses with phosphate (P2O5) contents fixed at 40, 45 and 50 mol%. The mechanical properties of the fibres were found to significantly increase with increasing B2O3 content. The highest tensile strength (1200 ± 130 MPa) was recorded for 45P2O5-16CaO-5Na2O-24MgO-10B2O3 glass fibres. The fibres were annealed, and a comparison of the mechanical properties and mode of degradation of annealed and non-annealed fibres were investigated. A decrease in tensile strength and an increase in tensile modulus were observed for the annealed fibres. An assessment of the change in mechanical properties of both the annealed and non-annealed fibres was performed in phosphate-buffered saline (PBS) at 37℃ for 28 and 60 days, respectively. Initial loss of mechanical properties due to annealing was found to be recovered with degradation. The B2O3-containing glass fibres were found to degrade at a much slower rate as compared to the non-B2O3-containing fibres. Both annealed and non-annealed fibres exhibited a peeling effect of the fibre's outer layer during degradation.
authors.affiliation: Division of Materials, Mechanics and Structures, University of Nottingham, Nottingham, UK.
authors.forename: Nusrat
authors.initials: N
authors.lastname: Sharmin
authors.affiliation: Division of Materials, Mechanics and Structures, University of Nottingham, Nottingham, UK.
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Parsons
authors.affiliation: Division of Materials, Mechanics and Structures, University of Nottingham, Nottingham, UK.
authors.forename: Chris D
authors.initials: CD
authors.lastname: Rudd
authors.affiliation: Division of Materials, Mechanics and Structures, University of Nottingham, Nottingham, UK ifty.ahmed@nottingham.ac.uk.
authors.forename: Ifty
authors.initials: I
authors.lastname: Ahmed
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D001896:Boron Compounds / Q000737:chemistry*; D005898:Glass; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D010710:Phosphates / Q000737:chemistry; D017553:Phosphorus Compounds / Q000737:chemistry*; D011312:Pressure; D012995:Solubility; D013314:Stress, Mechanical; D013718:Tensile Strength; D023822:Tissue Engineering / Q000379:methods*
chemical_list: D001672:Biocompatible Materials; D001896:Boron Compounds; D010710:Phosphates; D017553:Phosphorus Compounds; C042168:boron oxide; C012500:phosphorus pentoxide
keywords: Phosphate glass fibres; annealing; dissolution behaviour; fibre drawing; mechanical properties