1.1 该定量测试方法讨论了超高分子量聚乙烯（UHMWPE）的熔化热和熔点的测量，以及随后结晶度百分比的计算。该方法使用差示扫描量热计，可以在实验室或现场进行。 1.2 该测试方法可用于粉末形式、固结形式、成品或使用过的产品的UHMWPE。它也可用于辐照或化学交联的UHMWPE。 1.3 该测试方法并不建议特定应用所需的结晶度或熔点范围。 1.4 以国际单位制表示的数值应视为标准。本标准不包括其他计量单位。 1.5 本标准并不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。 1.6 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 UHMWPE的结晶度会影响其蠕变和刚度等力学性能。报道的结晶度将取决于用于确定熔化热的积分范围，以及100的理论熔化热 % 结晶聚乙烯，用于计算未知样品的结晶度百分比。 差示扫描量热法是准确测量熔化热和熔化温度的有效方法。 5.2 这种测试方法对过程控制和研究都很有用。

1.1 This quantitative test method discusses the measurement of the heat of fusion and the melting point of ultra-high molecular weight polyethylene (UHMWPE), and the subsequent calculation of the percentage of crystallinity. The method uses a differential scanning calorimeter and can be performed in the laboratory or in the field. 1.2 This test method can be used for UHMWPE in powder form, consolidated form, finished product, or a used product. It can also be used for irradiated or chemically crosslinked UHMWPE. 1.3 This test method does not suggest a desired range of crystallinity or melting points for specific applications. 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 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. 1.6 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 The crystallinity of UHMWPE will influence its mechanical properties, such as creep and stiffness. The reported crystallinity will depend on the integration range used to determine the heat of fusion, and the theoretical heat of fusion of 100 % crystalline polyethylene used to calculate the percent crystallinity in an unknown specimen. Differential scanning calorimetry is an effective means of accurately measuring both heat of fusion and melting temperature. 5.2 This test method is useful for both process control and research.