1.1 本试验方法描述了通过电离辐射或化学方法交联的超高分子量聚乙烯（UHMWPE）中的交联密度、交联之间的分子量和交联之间的重复单元数如何通过测量浸入邻二甲苯中的样品的溶胀率来确定。本文讨论了用于进行这些测量的实验技术的示例。 1.2 本文报告的测试方法测量样品浸入溶剂中时的高度变化。体积膨胀比假设样品各向同性交联，并且尺寸的变化在所有方向上都是均匀的。该技术避免了溶剂蒸发或温度变化引起的不确定性。 1.3 以国际单位制表示的数值应视为标准。 本标准中不包括其他计量单位。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ===意义和用途====== 5.1 该测试方法旨在产生指示化学交联或电离辐射交联的超高分子量聚乙烯的交联度的数据。 5.2 结果对测试温度、溶剂和使用的方法都很敏感。为了比较机构之间的数据，必须注意具有相同的检测条件和试剂。 5.3 这些数据可用于剂量均匀性分析、基础研究和质量保证测试。

1.1 This test method describes how the crosslink density, molecular weight between crosslinks, and number of repeat units between crosslinks in ultra high molecular weight polyethylene (UHMWPE) crosslinked by ionizing radiation or by chemical means can be determined by measuring the swelling ratio of samples immersed in o-xylene. Examples of experimental techniques used to make these measurements are discussed herein. 1.2 The test method reported here measures the change in height of a sample specimen while it is immersed in the solvent. Volumetric swell ratios assume that the sample is crosslinked isotropically, and that the change in dimension will be uniform in all directions. This technique avoids uncertainty induced by solvent evaporation or temperature change. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 This test method is designed to produce data indicative of the degree of crosslinking in ultra high molecular weight polyethylene that has been crosslinked chemically or by ionizing radiation. 5.2 The results are sensitive to the test temperature, solvent, and method used. For the comparison of data between institutions, care must be taken to have the same test conditions and reagents. 5.3 The data can be used for dose uniformity analysis, fundamental research, and quality assurance testing.