Journal
BIOMATERIALS
Volume 26, Issue 17, Pages 3471-3478Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biomaterials.2004.09.022
Keywords
hydroxyapatite; UHMWPE; composite; swelling; ball milling
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A new method for processing hydroxyapatite/ultrahigh molecular weight polyethylene (HA/UHMWPE) composite has been developed by combining wet ball milling and swelling. Sintered HA particles were ground in ethanol to similar to50 nm in diameter. The nano-sized HA particles were mechanically mixed with UHMWPE in the ball mill and then compression molded into solid slabs. The slabs were then swollen in a pharmaceutical grade paraffin oil to enhance the UHMWPE chain mobility and HA/UHMWPE interface adhesion before final hot press. The resultant composite exhibits a two-zone network structure formed by a homogeneous HA-rich phase and a UHMWPE-rich phase. This process resulted in a 90% increase in Young's modulus and a 50% increase in the yield strength of HA/UHMWPE composite, comparing with those of unfilled UHMWPE. (C) 2004 Elsevier Ltd. All rights reserved.
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