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The influence of poly(acrylic acid) molecular weight on the fracture toughness of glass-ionomer cements

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Abstract

A linear elastic fracture mechanics approach has been used to characterize failure in glass-ionomer cements. The toughness, fracture toughness, flexural strength and inherent flaw size increase with the molecular weight of the poly(acrylic acid), whilst the Young's modulus remains approximately constant. The dependence of toughness on poly(acrylic acid) molecular weight is not as large as predicted by a reptation/chain pull out model for fracture and this is thought to be a result of the weak ionic crosslinks formed during the cement reaction.

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Author notes

  1. R. G. Hill

    Present address: School of Materials Science and Physics, Thames Polytechnic, Wellington Street, SE18 6PF, London, UK

Authors and Affiliations

  1. Laboratory of the Government Chemist, Department of Trade and Industry, Cornwall House, Waterloo Road, SE1 8XY, London, UK

    R. G. Hill, A. D. Wilson & C. P. Warrens

Authors
  1. R. G. Hill
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  2. A. D. Wilson
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  3. C. P. Warrens
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Hill, R.G., Wilson, A.D. & Warrens, C.P. The influence of poly(acrylic acid) molecular weight on the fracture toughness of glass-ionomer cements. J Mater Sci 24, 363–371 (1989). https://doi.org/10.1007/BF00660982

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  • DOI: https://doi.org/10.1007/BF00660982

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