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Influence of processing aids and hydroxyapatite as fillers on flow behaviour and mechanical properties of ultra high molecular weight polyethylene/high density polyethylene composites

机译：加工助剂和羟基磷灰石作为填料对超高分子量聚乙烯/高密度聚乙烯复合材料流动性能和力学性能的影响

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摘要

In this study, blends of ultra high molecular weight polyethylene/high density polyethylene/polyethylene glycol (UHMWPE/HDPE/PEG) and the composites containing Hydroxyapatite (HA) as reinforcement filler were prepared via single screw extruder nanomixer followed by compression moulding. PEG (2phr) was used as processing aid and HA loadings were varied from 10 to 50 phr. HDPE and PEG were introduced to improve the extrudability of UHMWPE. Rheological behavior was studied via capillary rheometer while flexural and izod impact tests were conducted in order to investigate the mechanical properties of the blends and composites. Melt viscosity of the blends was found to decrease with increasing shear rate indicating a pseudoplastic behaviour. Incorporation of PEG shows a synergism effect on the reduction of blends viscosity. Blend of 40% UHMWPE/ 60% HDPE/ 2 phr PEG was chosen as the optimum blend composition with a balance properties in terms of the mechanical properties and processability. The incorporation of HA fillers from 10 to 50 phr into the blend resulted in the increase of flexural modulus and flexural strength with a slight decline of impact strength values. It can be concluded that the composites having adequate strength and modulus within the range of cancellous bone properties were succesfully developed to be used as biomedical implant devices.
机译：在这项研究中，超高分子量聚乙烯/高密度聚乙烯/聚乙二醇（UHMWPE / HDPE / PEG）与包含羟基磷灰石（HA）作为增强填料的复合材料的共混物是通过单螺杆挤出机纳米混合器制备，然后进行压塑。 PEG（2phr）用作加工助剂，HA的负载量在10至50phr之间变化。引入HDPE和PEG以改善UHMWPE的可挤出性。通过毛细管流变仪研究流变行为，同时进行挠曲和伊佐德冲击试验，以研究共混物和复合材料的机械性能。发现共混物的熔体粘度随剪切速率的增加而降低，表明其为假塑性行为。 PEG的掺入对降低共混物粘度显示出协同作用。选择40％UHMWPE / 60％HDPE / 2 phr PEG的共混物作为最佳的共混物组合物，在机械性能和可加工性方面具有平衡的性能。在混合物中掺入10至50 phr的HA填料导致弯曲模量和弯曲强度增加，而冲击强度值略有下降。可以得出结论，成功开发了在松质骨特性范围内具有足够强度和模量的复合材料，可用作生物医学植入装置。

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