1.1 这些试验方法描述了使用调制温度差示扫描量热法（MTDSC）在-120°C至+600°C的温度范围内分配材料的玻璃化转变温度。根据使用的仪器，温度范围可能会扩大。 1.2 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户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。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 材料在玻璃化转变时的分子迁移率增加，这被视为热容呈S形增加。这种迁移率的增加可能导致动力学事件，例如在接近玻璃化转变的温度下的焓恢复、化学反应或结晶。 与动力学事件相关的热流可能会干扰玻璃化转变的测定。 5.2 在差示扫描量热法中观察到玻璃化转变为比热容的S形或阶跃变化。 5.3 MTDSC提供了一种测试方法，用于分离因热容产生的热流和与动力学事件相关的热流，从而可以在存在干扰动力学事件的情况下确定玻璃化转变。 5.4 这些测试方法在研发、质量保证和控制以及规范验收中非常有用。 5.5 分配玻璃化转变温度的其他方法包括差示扫描量热法（试验方法 E1356 )，热机械分析（试验方法 E1545 )和动态力学分析（试验方法 E1640 ).

1.1 These test methods describe the assignment of the glass transition temperature of materials using modulated temperature differential scanning calorimetry (MTDSC) over the temperature range from –120 °C to +600 °C. The temperature range may be extended depending upon the instrumentation used. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 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. 1.4 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 Materials undergo an increase in molecular mobility at the glass transition seen as a sigmoidal step increase in the heat capacity. This mobility increase may lead to kinetic events such as enthalpic recovery, chemical reaction or crystallization at temperatures near the glass transition. The heat flow associated with the kinetic events may interfere with the determination of the glass transition. 5.2 The glass transition is observed in differential scanning calorimetry as a sigmoidal or step change in specific heat capacity. 5.3 MTDSC provides a test method for the separation of the heat flow due to heat capacity and that associated with kinetic events making it possible to determine the glass transition in the presence of interfering kinetic event. 5.4 These test methods are useful in research and development, quality assurance and control and specification acceptance. 5.5 Other methods for assigning the glass transition temperature include differential scanning calorimetry (Test Method E1356 ), thermomechanical analysis (Test Method E1545 ) and dynamic mechanical analysis (Test Method E1640 ).