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Structure–properties relationships in fibre drawing of bioactive phosphate glasses

Abstract

New bioactive phosphate glasses suitable for continuous fibre production are investigated in this work. The structure of both bulk and fibres from Na2O–CaO–MgO–P2O5 glasses has been studied by means of Raman and 31P and 23Na nuclear magnetic resonance spectroscopies, and the structural results have been correlated with the mechanical properties of the fibres and the dissolution rate of the bulk glasses. It has been observed that the mechanical properties of the phosphate glass fibres are influenced by the glass network connectivity, while the dissolution rates are governed by the Q i speciation of the PO4 units. As seen in previous studies, molar volume seems to play an important role in the fragility behaviour of phosphate glasses. Here, a lower molar volume resulting from the increase in the oxygen packing density hinders the cooperative flow of the PO4 units throughout the glass network and, therefore, causes a reduction in the kinetic fragility.

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Figure 1
Figure 2

Note Q 1 point in glass fibre x = 10 and x = 20 is not observed due to the overlap with other points

Figure 3

Note Eq. (8) is only applied for glasses containing 50 mol% or less of P2O5

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Acknowledgements

F. Muñoz and L. Muñoz-Senovilla are thankful to the projects MAT2010-20459 and MAT2013-48246-C2-1-P from MINECO of Spain, and L. Muñoz-Senovilla also thanks the MINECO for her Ph.D scholarship (BES-2011-044130). I. Ahmed and A. J. Parsons would like to thank the University of Nottingham for facilitating the hosting of L. Muñoz-Senovilla during her exchange visit. G. Tricot thanks would like to thank Region Nord Pas de Calais, Europe (FEDER), CNRS, University of Lille and TGIR-RMN-THC FR3050 CNRS for funding.

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Muñoz-Senovilla, L., Muñoz, F., Tricot, G. et al. Structure–properties relationships in fibre drawing of bioactive phosphate glasses. J Mater Sci 52, 9166–9178 (2017). https://doi.org/10.1007/s10853-017-0773-7

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  • DOI: https://doi.org/10.1007/s10853-017-0773-7

Keywords

  • Bioactive Glass
  • Phosphate Glass
  • Glass Network
  • Weibull Modulus
  • Bulk Glass