Universidad Central de Venezuela, Facultad de Ingeniería, Escuela de Ingeniería Química, Caracas, Venezuela.
J Mech Behav Biomed Mater. 2011 Apr;4(3):467-75. doi: 10.1016/j.jmbbm.2010.12.008. Epub 2010 Dec 21.
In this investigation, the behavior of the mechanical properties of composites of high-density polyethylene/hydroxyapatite (HDPE/HA) with and without ethylene-acrylic acid copolymer (EAA) as possible compatibilizer, was studied. Different mathematical models were used to predict their Young's modulus, tensile strength and elongation at break. A comparison with the experimental results shows that the theoretical models of Guth and Kerner modified can be used to predict the Young's modulus. On the other hand, the values obtained by the Verbeek model do not show a good agreement with the experimental data, since different factors that influence the mechanical properties are considered in this model such as: aspect ratio of the reinforcement, interfacial adhesion, porosity and binder content. TEM analysis confirms the discrepancies obtained between the experimental Young's modulus values and those predicted by the Verbeek model. The values of "P", "a" and "σ(A)" suggest that an interaction among the carboxylic groups of the copolymer and the hydroxyl groups of hydroxyapatite might be present. In composites with 20 and 30 wt% of filler, this interaction does not improve the Young's modulus values, since the deviations of the Verbeek model are significant.
在这项研究中，研究了高密度聚乙烯/羟基磷灰石（HDPE/HA）复合材料的力学性能，其中包括添加和不添加乙烯-丙烯酸共聚物（EAA）作为可能的增容剂的情况。使用了不同的数学模型来预测它们的杨氏模量、拉伸强度和断裂伸长率。与实验结果的比较表明，Guth 和 Kerner 修正的理论模型可用于预测杨氏模量。另一方面，Verbeek 模型得到的值与实验数据不符，因为该模型考虑了影响力学性能的不同因素，如增强体的长径比、界面附着力、孔隙率和粘结剂含量。TEM 分析证实了实验杨氏模量值与 Verbeek 模型预测值之间的差异。“P”、“a”和“σ(A)”的值表明，共聚物的羧酸基团和羟基磷灰石的羟基之间可能存在相互作用。在填充量为 20wt%和 30wt%的复合材料中，这种相互作用并没有提高杨氏模量值，因为 Verbeek 模型的偏差很大。
