1.1 这些测试方法包括测量称为穆尼粘度的特性的程序。穆尼粘度定义为嵌入圆柱腔内橡胶中的圆柱金属盘（或转子）抵抗旋转的剪切扭矩。剪切圆盘粘度计的尺寸、试验温度和测定门尼粘度的程序在这些试验方法中定义。 1.2 当制动盘突然停止旋转时，转子上的扭矩或应力会以某种速度减小，具体取决于被测橡胶和试验温度。这称为“应力松弛”，这些测试方法描述了测量这种松弛的测试方法。 注1: 这些试验方法中使用的粘度不是真实粘度，应解释为平均穆尼粘度，即在剪切速率范围内平均剪切扭矩的测量值。应力松弛也是测试配置的函数，对于这些测试方法，结果是穆尼粘度计独有的。 1.3 当在可能发生硫化的温度下将复合橡胶放置在穆尼粘度计中时，硫化反应会产生扭矩增加。这些试验方法包括测量橡胶硫化初始速率的程序。 1.4 ISO 289第1部分和第2部分还描述了穆尼粘度和预硫化特性的测定。除了一些无关紧要的差异外，ISO 289和本试验方法之间还有主要的技术差异，因为ISO 289没有规定在磨机上制备样品，而本试验方法在某些情况下允许在进行门尼粘度试验之前制备研磨样品。这可能导致某些橡胶的粘度值不同。 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。 1.7 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 粘度- 本试验方法确定的粘度值取决于分子结构、分子量和可能存在的非橡胶成分。由于橡胶表现为非牛顿流体，分子量和粘度之间不存在简单的关系。因此，在解释橡胶的粘度值时必须小心，尤其是在分子量非常高的情况下。 例如，随着分子量增加，在100°C（212°F）下，使用转速为2 r/min的大转子，IIR聚合物（丁基橡胶）的粘度值达到约80的上限，然后可能会降低到相当低的值。对于这些高分子量橡胶，如果测试温度升高，粘度值和分子量之间的相关性更好。 5.2 应力松弛- 橡胶的应力松弛行为是弹性和粘性响应的组合。粘度和应力松弛行为不以同样的方式取决于分子量和非橡胶成分等因素。因此，这两种测试都很重要，相互补充。松弛速率较慢表示整体响应中的弹性成分较高，而松弛速率较快表示粘性成分较高。研究发现，应力松弛速率与橡胶结构特征（如分子量分布、支链和凝胶含量）相关。 5.3 预硫化特性- 可以用穆尼粘度计检测硫化开始，粘度增加就是证明。因此，本试验方法可用于测量早期硫化（焦烧）时间和硫化阶段的硫化速率。该试验方法不能用于研究完全硫化，因为当试样达到硬稠度时，圆盘的连续旋转将导致滑动。

1.1 These test methods cover procedures for measuring a property called Mooney viscosity. Mooney viscosity is defined as the shearing torque resisting rotation of a cylindrical metal disk (or rotor) embedded in rubber within a cylindrical cavity. The dimensions of the shearing disk viscometer, test temperatures, and procedures for determining Mooney viscosity are defined in these test methods. 1.2 When disk rotation is abruptly stopped, the torque or stress on the rotor decreases at some rate depending on the rubber being tested and the temperature of the test. This is called “stress relaxation” and these test methods describe a test method for measuring this relaxation. Note 1: Viscosity as used in these test methods is not a true viscosity and should be interpreted to mean Mooney viscosity, a measure of shearing torque averaged over a range of shearing rates. Stress relaxation is also a function of the test configuration and for these test methods the results are unique to the Mooney viscometer. 1.3 When compounded rubber is placed in the Mooney viscometer at a temperature at which vulcanization may occur, the vulcanization reaction produces an increase in torque. These test methods include procedures for measuring the initial rate of rubber vulcanization. 1.4 ISO 289 Parts 1 and 2 also describes the determination of Mooney viscosity and pre-vulcanization characteristics. In addition to a few insignificant differences there are major technical differences between ISO 289 and this test method in that ISO 289 does not provide for sample preparation on a mill, while this test method allows milling sample preparation in some cases prior to running a Mooney viscosity test. This can result in different viscosity values for some rubbers. 1.5 The values stated in SI units are to be regarded as the standard. The values given in parentheses are 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 Viscosity— Viscosity values determined by this test method depend on molecular structure, molecular weight, and non-rubber constituents that may be present. Since rubber behaves as a non-Newtonian fluid, no simple relationship exists between the molecular weight and the viscosity. Therefore, caution must be exercised in interpreting viscosity values of rubber, particularly in cases where molecular weight is very high. For example, as the molecular weight increases, the viscosity values for IIR polymers (butyl rubbers) reach an upper limit of about 80, at 100°C (212°F) using a large rotor at a rotation speed of 2 r/min, and may then decrease to considerably lower values. For these higher molecular weight rubbers, better correlation between viscosity values and molecular weight is obtained if the test temperature is increased. 5.2 Stress Relaxation— The stress relaxation behavior of rubber is a combination of both an elastic and a viscous response. Viscosity and stress relaxation behavior do not depend on such factors as molecular weight and non-rubber constituents in the same way. Thus both of these tests are important and complement each other. A slow rate of relaxation indicates a higher elastic component in the overall response, while a rapid rate of relaxation indicates a higher viscous component. The rate of stress relaxation has been found to correlate with rubber structure characteristics such as molecular weight distribution, chain branching, and gel content. 5.3 Pre-Vulcanization Characteristics— The onset of vulcanization can be detected with the Mooney viscometer as evidenced by an increase in viscosity. Therefore, this test method can be used to measure incipient cure (scorch) time and the rate of cure during very early stages of vulcanization. This test method cannot be used to study complete vulcanization because the continuous rotation of the disk will result in slippage when the specimen reaches a stiff consistency.