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Quasi-static and dynamic nanoindentation studies on highly crosslinked ultra-high-molecular-weight polyethylene

机译：高度交联的超高分子量聚乙烯的准静态和动态纳米压痕研究

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摘要

In four separate studies, the effect of three methods used to highly crosslink ultra-high-molecular-weight polyethylene (UHMWPE) (gamma irradiation, electron beam irradiation, and peroxide treatment) on the polymer's stiffness was investigated using quasi-static and dynamic nanoindentation. From the quasi-static studies, it was found that (a) the highest value of the elastic modulus, E (2240+/-157 MPa) was obtained from specimens prepared from direct compression molded UHMWPE crosslinked using gamma irradiation, with a dosage of 7.5 Mrad; (b) the value of E for specimens formed from direct compression molded UHMWPE was higher (1950+/-255 MPa) compared to results obtained from specimens formed from ram extruded UHMWPE (1583+/-140 MPa); and (c) the magnitude of the decrease in the value of E as a result of subjecting a highly crosslinked UHMWPE specimen to uniaxial tensile forces depends on the method used for the crosslinking. From the dynamic study, (d) it was found that the extent of the change in both the storage modulus and the loss modulus, as a result of subjecting a highly crosslinked UHMWPE specimen to uniaxial tension forces, depends on the method used for the crosslinking. (C) 2003 Elsevier Ltd. All rights reserved. [References: 44]
机译：在四项单独的研究中，使用准静态和动态纳米压痕技术研究了三种用于高度交联超高分子量聚乙烯（UHMWPE）的方法（γ辐射，电子束辐射和过氧化物处理）对聚合物刚度的影响。 。从准静态研究中，发现（a）弹性模量的最大值E（2240 +/- 157 MPa）是由使用γ辐照交联的直接压制成型的UHMWPE制备的样品获得的，剂量为7.5马拉德; （b）由直接压制成型的UHMWPE制成的试样的E值（1950 +/- 255 MPa）比由冲压挤压的UHMWPE制成的试样（1583 +/- 140 MPa）更高。 （c）由于使高度交联的UHMWPE试样承受单轴拉伸力而导致的E值下降的幅度取决于用于交联的方法。从动力学研究中，（d）发现，由于高度交联的UHMWPE试样受到单轴拉伸力的作用，储能模量和损耗模量的变化程度取决于用于交联的方法。 （C）2003 Elsevier Ltd.保留所有权利。 [参考：44]

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