Zhang Y, Tanner K E
Department of Materials, Queen Mary University of London, Mile End Road, London, UK.
J Mater Sci Mater Med. 2008 Feb;19(2):761-6. doi: 10.1007/s10856-007-3119-1. Epub 2007 Jul 10.
Instrumented falling weight impact tests have been carried out to characterize the impact behaviour of hydroxyapatite reinforced high-density polyethylene composite (HA-HDPE) in order to use this biomaterial in skull implants. The effects of HA filler surface morphology and volume fraction on the fracture toughness were studied, and fracture mechanism investigated. Impact resistance was found to be markedly improved by using a sintered grade HA filler with smooth particle surface instead of spray dried grade HA with rough surface. SEM examination of impacted fracture surfaces revealed that the improvement of impact resistance was due to the stronger interfacial bonding between smooth HA particles and HDPE polymer matrix compared with that between rough HA and HDPE, which results in more energy absorption during impact and hence better fracture resistance.
已进行了仪器化落锤冲击试验，以表征羟基磷灰石增强高密度聚乙烯复合材料（HA-HDPE）的冲击行为，以便将这种生物材料用于颅骨植入物。研究了HA填料表面形态和体积分数对断裂韧性的影响，并对断裂机理进行了研究。结果发现，使用具有光滑颗粒表面的烧结级HA填料而不是具有粗糙表面的喷雾干燥级HA，抗冲击性得到了显著提高。对冲击断裂表面的扫描电子显微镜检查表明，抗冲击性的提高是由于光滑的HA颗粒与HDPE聚合物基体之间的界面结合比粗糙的HA与HDPE之间的界面结合更强，这导致在冲击过程中吸收更多能量，从而具有更好的抗断裂性。
