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Processing of hydroxyapatite reinforced ultrahigh molecular weight polyethylene for biomedical applications

Authors Fang, Liming
Leng, Yang View this author's profile
Gao, Ping View this author's profile
Issue Date 2005
Source Biomaterials , v. 26, (17), 2005, JUN, p. 3471-3478
Summary 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.
ISSN 0142-9612
Language English
Format Article
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