Surface and chemical properties of surface-modified UHMWPE powder and mechanical and thermal properties of its impregnated PMMA bone cement VIII. Effect of acids treatment on surface modification of UHMWPE powder

Surface and chemical properties of surface-modified UHMWPE powder and mechanical and thermal properties of its impregnated PMMA bone cement VIII. Effect of acids treatment on surface modification of UHMWPE powder

Ultra high molecular weight polyethylene(UHMWPE) powders were impregnated into poly(methylmethacrylate)( PMMA) bone cement to improve the poor mechanical and thermal properties of the bone cement. But, the surface inertness of UHMWPE powder generated the poor bonding force with PMMA bone cement. The surface modification after pretreating UHMWPE powder with the three kinds of acid such as acetic, hydrochloric, and sulfuric acid has been carried out to advance the interfacial adhesion between UHMWPE powder and PMMA bone cement. The tensile strengths of reinforced PMMA bone cements with 3 wt% of surface-precoated UHMWPE powder with polyMMA after acids treatment were much higher than that(33.8 MPa) of 3 wt% of intact UHMWPE powder impregnated PMMA bone cement as well as were almost same as that(44.5 MPa) of conventional PMMA bone cement. Also, it was found that the curing temperatures of the composite PMMA bone cements were much lower than that(~103oC) of conventional PMMA bone cement. From these results, it was confirmed that acids treatment effectively modified the surface of UHMWPE powder. A possible mechanism for the surface modification of UHMWPE powder by acids treatment was proposed.

Ultra high molecular weight polyethylene(UHMWPE) powders were impregnated into poly(methylmethacrylate)( PMMA) bone cement to improve the poor mechanical and thermal properties of the bone cement. But, the surface inertness of UHMWPE powder generated the poor bonding force with PMMA bone cement. The surface modification after pretreating UHMWPE powder with the three kinds of acid such as acetic, hydrochloric, and sulfuric acid has been carried out to advance the interfacial adhesion between UHMWPE powder and PMMA bone cement. The tensile strengths of reinforced PMMA bone cements with 3 wt% of surface-precoated UHMWPE powder with polyMMA after acids treatment were much higher than that(33.8 MPa) of 3 wt% of intact UHMWPE powder impregnated PMMA bone cement as well as were almost same as that(44.5 MPa) of conventional PMMA bone cement. Also, it was found that the curing temperatures of the composite PMMA bone cements were much lower than that(~103oC) of conventional PMMA bone cement. From these results, it was confirmed that acids treatment effectively modified the surface of UHMWPE powder. A possible mechanism for the surface modification of UHMWPE powder by acids treatment was proposed.