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Hydrolysis of tetracalcium phosphate in the presence of a poly(alkenoic acid)

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Abstract

Ca4(PO4)2O (TetCP) reacts with an acidic polyelectrolyte in the absence of a solvent to form a composite composed of Ca10(PO4)6(OH)2 (hydroxyapatite, or HAp) and the Ca salt of the polyelectrolyte. Mixtures of an acrylic copolymer and TetCP powders were hot-pressed, and the effects of temperature, pressure, and time on HAp formation were studied. Reaction starts when the copolymer is heated to above T g. Initial carboxyl site neutralization liberates water, continued TetCP hydrolysis, liberates Ca2+ ions, which react with the copolymer forming its Ca salt. When 90% conversion to HAp was achieved, the composite had an average tensile strength of 51 MPa, a Vickers hardness of 145 kg/mm2 and a T g ˜50 °C.

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Authors and Affiliations

  1. Intercollege Materials Research Laboratory, Pennsylvania State University, University Park, Pennsylvania, 16802, USA

    Y. E. Greish & P. W. Brown

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  1. Y. E. Greish
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  2. P. W. Brown
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Greish, Y.E., Brown, P.W. Hydrolysis of tetracalcium phosphate in the presence of a poly(alkenoic acid). Journal of Materials Research 14, 4637–4642 (1999). https://doi.org/10.1557/JMR.1999.0627

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  • DOI: https://doi.org/10.1557/JMR.1999.0627

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