Influence of alkali metal ions on the fracture properties of glass polyalkenoate (ionomer) cements

Biomaterials
E De Barra, R G Hill

Abstract

The influence of substituting sodium for calcium on the properties of glass polyalkenoate cements was investigated. Two series of glass compositions based on PSiO2 x QAl2O3 x 0.75P2O5 x (1 - Z)CaO x XCaF2ZNa2O were studied. The fluorine content was fixed at X = 0.50 and 0.75 and the sodium content varied by altering Z. The glass polyalkenoate cements formed from these glasses were characterized using a linear elastic fracture mechanics (LEFM) approach. In addition, compressive strengths of the cements were determined. The properties of the cements based on the high fluorine content glasses (X = 0.75) were relatively insensitive to sodium content. The Young's modulus, un-notched fracture strength and fracture toughness of the cements produced with the lower fluorine content glasses (X = 0.5) reduced with sodium content, which was consistent with sodium acting to disrupt ionic cross-linking in the polyacrylate matrix. The compressive strength was not as dependent on sodium content as the LEFM parameters.

Citations

Oct 9, 2007·Journal of Materials Science. Materials in Medicine·Reisha N Rafeek
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