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首页> 外文期刊>Acta biomaterialia >The influence of sterilization processes on the micromechanical properties of carbon fiber-reinforced PEEK composites for bone implant applications.
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The influence of sterilization processes on the micromechanical properties of carbon fiber-reinforced PEEK composites for bone implant applications.

机译：灭菌工艺对用于骨植入物的碳纤维增强PEEK复合材料的微机械性能的影响。

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摘要

The effect of sterilization on the structural integrity of the thermoplastic matrix composite polyetheretherketone (PEEK) reinforced with carbon fibers (CF) is investigated by nanoindentation and nanoscratch tests. The use of the material as a medical implant grade requires a detailed understanding of the micromechanical properties which primarily define its in vivo behavior. Sterilization is a mandatory process for such materials used in medical applications like bone implants. The steam and gamma radiation sterilization processes employed in this study are at sufficient levels to affect the micromechanical properties of some polymer materials, particularly in the interphase region between the polymer matrix and the reinforcing fibers. Nanoindentation and nanoscratch tests are used in this work to reveal local gradients in the hardness and the elastic properties of the interphase regions. Both methods help to explore microscopic changes in the hardness, reduced stiffness and scratch resistance in the interphase region and in the bulk polymer matrix due to the different sterilization processes employed. The results reveal that neither steam nor gamma radiation sterilization entails significant changes of the reduced elastic modulus, hardness or coefficient of friction in the bulk polymer matrix. However, minor material changes of the PEEK matrix were observed in the interphase region. Of the two sterilization methods used, the steam treatment has a more significant influence on these small changes in this region and appears to increase slightly the thickness of the interphase zone.
机译：通过纳米压痕和纳米划痕试验研究了灭菌对碳纤维（CF）增强的热塑性基体复合聚醚醚酮（PEEK）结构完整性的影响。将该材料用作医用植入物等级需要详细了解主要定义其体内行为的微机械性能。对于用于医疗应用的此类材料（如骨植入物），灭菌是必不可少的过程。在这项研究中采用的蒸汽和伽马射线灭菌工艺的浓度足以影响某些聚合物材料的微机械性能，特别是在聚合物基体和增强纤维之间的中间区域。在这项工作中使用了纳米压痕和纳米划痕测试，以揭示相间区域的硬度和弹性特性的局部梯度。两种方法都有助于探索由于采用不同的灭菌过程而导致的相间区域和本体聚合物基体中硬度，降低的刚度和耐刮擦性的微观变化。结果表明，蒸汽和伽马辐射灭菌都不会导致本体聚合物基体中降低的弹性模量，硬度或摩擦系数发生显着变化。但是，在相间区域观察到了PEEK基质的微小变化。在使用的两种灭菌方法中，蒸汽处理对该区域的这些小变化具有更大的影响，并且似乎会稍微增加相间区域的厚度。

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