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首页> 外文期刊>Journal of Applied Polymer Science >Morphological Correlations to Mechanical Performance of Hydroxyapatite-Filled HDPE/UHMWPE Composites
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Morphological Correlations to Mechanical Performance of Hydroxyapatite-Filled HDPE/UHMWPE Composites

机译：羟基磷灰石填充HDPE / UHMWPE复合材料的力学性能形态相关性

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摘要

Melt mixed and injection molded hydroxyapatite (Hap) filled high-density polyethylene/ultrahigh molecular weight polyethylene composites were assessed for their thermal, structural, morphological, and mechanical attributes. Differential scanning calorimetry was conducted to analyze the effect of Hap loading on various thermal transitions and their associated enthalpies. The microstructural attributes were characterized by conducting wide angle X-ray diffraction and scanning electron microscopy (SEM) of cryo-fractured surface. SEM micrographs of tensile fractured surface revealed the systematic reduction in the size of microfibrils indicating the suppression of local deformation. Improvement in low-strain mechanical response and flexural properties accompanied with a consistent decrease in strain-at-break and toughness was witnessed with increasing Hap content. Toughness aspects were critically discussed in the realms of quasi-static, dynamic mechanical and sudden impact testing approach. Dynamic mechanical analysis demonstrated the presence of prominent alpha and gamma transitions in the crystalline and amorphous phase respectively. Tensile fractured surface morphologies of the investigated composites revealed a switch-over from matrix dominated plastic deformation to Hap controlled quasi-brittle fracture. Thus, our study fundamentally deals with the feasibility of designing polyethylene/Hap composites with superior mechanical properties for biomedical applications, especially for orthopedic implants. (C) 2014 Wiley Periodicals, Inc.
机译：评估了熔融混合和注射成型的羟基磷灰石（Hap）填充的高密度聚乙烯/超高分子量聚乙烯复合材料的热，结构，形态和机械特性。进行差示扫描量热法以分析Hap负载对各种热转变及其相关焓的影响。通过对低温断裂表面进行广角X射线衍射和扫描电子显微镜（SEM）表征其微观结构特征。拉伸断裂表面的SEM显微照片显示微纤维尺寸的系统减小，表明抑制了局部变形。随着Hap含量的增加，低应变机械响应和挠曲性能得到改善，同时断裂应变和韧性不断降低。在准静态，动态机械和突然冲击测试方法领域中严格讨论了韧性方面。动态力学分析表明在结晶相和非晶相中分别存在明显的α和γ跃迁。研究的复合材料的拉伸断裂表面形态揭示了从基体主导的塑性变形到Hap控制的准脆性断裂的转变。因此，我们的研究从根本上解决了为生物医学应用，特别是骨科植入物设计具有优异机械性能的聚乙烯/哈普复合材料的可行性。 （C）2014威利期刊公司

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