IngentaConnect Effect of surface modification of polymer beads on the mechanical...

Authors: Shafranska, Olena¹; Kokott, Andreas¹; Sülthaus, Dietrich²; Ziegler, Günter¹

Source: Journal of Biomaterials Science, Polymer Edition, Volume 18, Number 4, 2007 , pp. 439-451(13)

Abstract:

The effect of surface modification of polymer filler on the static mechanical properties of acrylic bone cement was studied. The surface of polymer beads was modified with carboxylic and amino groups by photochemical reaction with azide compounds. Monomer modifiers (maleic anhydride, methacrylic acid and p-aminostyrene) are attached to the functionalized surface of polymer beads. Functional allyl groups, which are capable of the graft polymerisation reaction, are attached to the surface via photochemical reaction with N-(2-nitro-4-azidophenyl)-N-(-propen) amine. This approach to bone cement provides the additional covalent bonds between the polymer beads and the inter-bead matrix. The static mechanical properties of bone cements containing modified polymer beads were investigated and compared with the static mechanical properties of unmodified cements. The absolute values of compressive strength for the modified and unmodified cements were found to be similar. An increase in flexural strength for the modified cements (dry and after water storage) was observed. The structure of the surface functional groups affects the methyl methacrylate grafting resulting in a higher value of flexural strength for the maleic anhydride- and p-aminostyrene-modified cements. The scanning electron microscopy examination of the fracture surface of the cement samples showed an improvement of the adhesion between the beads and the matrix after modification.

Keywords: ACRYLIC BONE CEMENT; MECHANICAL PROPERTIES; COMPOSITE; SURFACE MODIFICATION

Document Type: Research article

DOI: 10.1163/156856207780425040

Affiliations: 1: Friedrich-Baur Research Institute for Biomaterials, University of Bayreuth, Ludwig-Thoma Str. 36c, 95447 Bayreuth, Germany 2: Department of Polymer Materials, University of Bayreuth, Universitätstr. 30, 95447 Bayreuth, Germany

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Effect of surface modification of polymer beads on the mechanical properties of acrylic bone cement