1.1 本试验方法描述了玻璃化转变温度的分配程序( T g )在使用热机械测量加热时材料的张力方面。 1.2 本试验方法可用作试验方法的补充 E1545 并且适用于膜、纤维、线材等形式的非晶或部分结晶材料，这些材料具有足够的刚性以在环境温度下的加载过程中抑制延伸。 1.3 该试验方法的一般适用温度范围为25°C至600°C。此温度范围可能会根据所用仪器的不同而变化。 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 玻璃化转变取决于待测试材料的热历史、软化剂或添加剂。对于非晶态和半晶态材料，玻璃化转变温度的分配可能导致关于热历史、加工条件、稳定性、化学反应的进展以及机械和电学行为的重要信息。 5.2 热机械分析提供了检测与玻璃化转变相关的硬度变化或线性尺寸变化的快速手段。当试样在玻璃化转变区域上加热时测量的尺寸变化可能包括几种效应的相互作用:膨胀系数的增加、模量的降低（在恒定应力下会导致拉伸增加）、应力消除导致不可逆的尺寸变化（一个维度的收缩、另一个维度的膨胀），以及物理老化效应，这些效应会改变尺寸变化的动力学。 5.3 该测试方法适用于研发、质量控制和规范验收测试；特别是薄膜和纤维。

1.1 This test method describes a procedure for the assignment of a glass transition temperature ( T g ) in tension of materials on heating using thermomechanical measurements. 1.2 This test method may be used as a complement to Test Method E1545 and is applicable to amorphous or to partially crystalline materials in the form of films, fibers, wires, etc., that are sufficiently rigid to inhibit extension during loading at ambient temperature. 1.3 The generally applicable temperature range for this test method is 25 °C to 600 °C. This temperature range may be altered depending upon the instrumentation used. 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 glass transition is dependent on the thermal history, softening agents or additives of the material to be tested. For amorphous and semicrystalline materials the assignment of a glass transition temperature may lead to important information about thermal history, processing conditions, stability, progress of chemical reactions, and mechanical and electrical behavior. 5.2 Thermomechanical analysis provides a rapid means of detecting changes in hardness or linear dimensional change associated with the glass transition. Dimensional changes measured as a specimen is heated over the glass transition region may include the interaction of several effects: an increase in the coefficient of expansion, a decrease in the modulus, which under a constant stress leads to increased extension, stress relief leading to irreversible dimensional change (shrinkage in one dimension, expansion in another dimension), and physical aging effects which change the kinetics of the dimensional change. 5.3 This test method is useful for research and development, quality control, and specification acceptance testing; particularly of films and fibers.