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

Y. E. Greish; P. W. Brown

doi:10.1557/JMR.1999.0627

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

Y. E. Greish, P. W. Brown

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

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 to approximately 250 °C.

Original language	English
Pages (from-to)	4637-4642
Number of pages	6
Journal	Journal of Materials Research
Volume	14
Issue number	12
DOIs	https://doi.org/10.1557/JMR.1999.0627
Publication status	Published - Dec 1999
Externally published	Yes

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1557/JMR.1999.0627

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title = "Hydrolysis of tetracalcium phosphate in the presence of a poly(alkenoic acid)",

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 Tg. 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 Tg to approximately 250 °C.",

author = "Greish, {Y. E.} and Brown, {P. W.}",

note = "Funding Information: The authors gratefully acknowledge National Science Foundation DMR 9510272.",

year = "1999",

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language = "English",

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journal = "Journal of Materials Research",

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publisher = "Materials Research Society",

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T1 - Hydrolysis of tetracalcium phosphate in the presence of a poly(alkenoic acid)

AU - Greish, Y. E.

AU - Brown, P. W.

N1 - Funding Information: The authors gratefully acknowledge National Science Foundation DMR 9510272.

PY - 1999/12

Y1 - 1999/12

N2 - 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 Tg. 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 Tg to approximately 250 °C.

AB - 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 Tg. 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 Tg to approximately 250 °C.

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

Abstract

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