Characterization of wollastonite-reinforced HAp-Ca polycarboxylate composites

Y. E. Greish, P. W. Brown

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


The effects of wollastonite on the mechanical properties and in vitro behavior of hydroxyapatite-Ca polyacrylate composites were studied. Powder mixtures of tetracalcium phosphate, poly(acrylic-co-itaconic), and wollastonite fibers (≤75% by weight) were hot-pressed for 30 min at 300°C and 60 kpsi. Tensile strengths, elastic moduli, and microstructures of the composites were investigated. The tensile strengths of these composites were improved by the addition of wollastonite fibers, whereas the elastic moduli decreased. The highest value of tensile strength (∼155 MPa) was achieved by the addition of 40% wollastonite. Composites were immersed in simulated body fluid (SBF) for up to 14 days and then in 1.5 SBF for a week. The changes in the concentrations of Ca, Si, and P ions and the pH of these solutions indicate bioactivity. An evaluation of the microstructures of the composites after SBF immersion indicated that apatite layers had formed on the surfaces of the composites.

Original languageEnglish
Pages (from-to)618-628
Number of pages11
JournalJournal of Biomedical Materials Research
Issue number4
Publication statusPublished - Jun 15 2001
Externally publishedYes


  • Acrylates
  • Bio-activity
  • Composites
  • Hydroxyapatite
  • Wollastonite

ASJC Scopus subject areas

  • Biomaterials
  • Biomedical Engineering


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