1.1 本实践涵盖了几种不同的技术，用于确定橡胶和类橡胶材料的应力松弛特性，以及将该应力松弛信息可能相互转换为动态力学性能。 1.2 该技术适用于应力松弛模量在10范围内的材料 3. 至10 8. Pa（0.1至1.5 × 10 4. psi），试验温度为23 °C至225 °C（73 °F至437 °F）。并非所有的测量设备都能够适应整个范围。这些技术还旨在测量处于橡胶或熔融状态的材料，或同时测量两者。 1.3 在不同的技术中会发现结果的差异。由于这些差异，测试报告需要包括测试的技术和条件。这些信息将允许解决与测试测量有关的任何问题。 1.4 对设备的广义描述是基于力作为时间函数的测量。对这种关系的数学处理产生了可以代表材料特性的信息。力测量的数学转换将首先产生应力松弛模量，随后的转换将产生动态力学性能。 1.5 以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 1.6 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。 1.7 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 橡胶或类橡胶材料的加工行为（可加工性）与其粘弹性特性密切相关。粘弹性性能和力学性能都与聚合物有关，包括大分子和微分子结构。因此，材料粘弹性的测定将提供预测加工和服务性能的信息。 5.2 应力松弛试验为研究橡胶或类似橡胶材料的粘弹性提供了一种方法。已证明通过该试验方法进行评估的某些结构特征为: ( 1. )平均分子量( 2. )分子量分布( 3. )线性或支链( 4. )凝胶含量，以及( 5. )单体比例。 5.3 本规程旨在描述测量生橡胶、未硫化橡胶化合物或热塑性弹性体的应力松弛特性的各种方法，以通过粘弹性测量来确定这些材料的可加工性。该方法可能与工厂性能特征相关，包括模具膨胀或收缩、挤出速率、轧制带、炭黑掺入时间和模具流动。

1.1 This practice covers several different techniques for determining the stress relaxation characteristics of rubber and rubberlike materials and for the possible interconversion of this stress relaxation information into dynamic mechanical properties. 1.2 The techniques are intended for materials having stress relaxation moduli in the range of 10 3 to 10 8 Pa (0.1 to 1.5 × 10 4 psi) and for test temperatures from 23 °C to 225 °C (73 °F to 437 °F). Not all measuring apparatus may be able to accommodate the entire ranges. These techniques are also intended for measurement of materials in their rubbery or molten states, or both. 1.3 Differences in results will be found among the techniques. Because of these differences, the test report needs to include the technique and the conditions of the test. This information will allow for resolving any issues pertaining to the test measurements. 1.4 The generalized descriptions of apparatus are based on the measurement of force as a function of time. Mathematical treatment of that relationship produces information that can be representative of material properties. Mathematical transformation of the force measurements will first yield stress relaxation moduli with subsequent transformation producing dynamic mechanical properties. 1.5 The values stated in SI units are to be regarded as the standard. The values given in parentheses are provided for information only. 1.6 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. 1.7 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 processing behavior (processability) of rubber or rubberlike materials is closely related to their viscoelastic properties. The viscoelastic properties as well as the mechanical properties are related to the polymeric, including macromolecular and micromolecular structure. Therefore, a determination of the viscoelasticity of a material will provide information to predict processing and service performance. 5.2 Stress relaxation testing provides a methodology for investigating the viscoelasticity of rubber or rubberlike materials. Certain structural characteristics that have been demonstrated to be evaluated by this test method are: ( 1 ) average molecular weight, ( 2 ) molecular weight distribution, ( 3 ) linearity or chain branching, ( 4 ) gel content, and ( 5 ) monomer ratio. 5.3 This practice is intended to describe various methods of measuring the stress relaxation properties of raw rubber, unvulcanized rubber compounds, or thermoplastic elastomers for determining the processability of these materials through viscoelastic measurements. Factory performance characteristics that this methodology may correlate with include die swell or shrinkage, extrusion rate, mill banding, carbon black incorporation time, and mold flow.