Journal
BIOMATERIALS
Volume 23, Issue 21, Pages 4295-4302Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S0142-9612(02)00192-8
Keywords
hydroxyapatite; composite; rheology; injection moulding; polyethylene; morphology; surface
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The commercial success of hydroxyapatite (HA) filled polyethylene composite has generated growing interest in improving the processability of the composite. A number of synthetic procedures and post synthesis heat treatment of HA has lead to the availability of powders with widely varying morphological features. This paper addresses the effect of morphological features of HA on the rheology and processability of an injection-moulding grade HA-HDPE composite. The results showed that low surface area HA filled composite exhibited better injection processing characteristics through improved rheological responses. The effect of reducing the surface area of the filler is to require less polyethylene to wet the filler and allows more polyethylene to be involved in the flow processes. These changes reduced the temperatures and pressures required for Successful Processing. (C) 2002 Elsevier Science Ltd. All rights reserved.
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