ISO 1133-2:2011 塑料 热塑性塑料熔体质量流动速率（MFR）和熔体体积流动速率（MVR）的测定 第2部分：对时间-温度历程与/或湿气敏感的材料所用的方法

标准编号：ISO 1133-2:2011

中文名称：塑料 热塑性塑料熔体质量流动速率（MFR）和熔体体积流动速率（MVR）的测定 第2部分：对时间-温度历程与/或湿气敏感的材料所用的方法

英文名称：Plastics — Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR) of thermoplastics — Part 2: Method for materials sensitive to time-temperature history and/or moisture

发布日期：2011-12

标准范围

ISO 1133-2:2011规定了热塑性材料熔体体积流动速率（MVR）和熔体质量流动速率（MFR）的测定程序，热塑性材料对试样在试验过程中经历的时间-温度历史和/或水分表现出高度的流变敏感性。这种方法可能不适用于流变性能在试验期间受到极大影响的材料。如果已知试验温度和压力下的熔体密度，则可以通过MVR测量值的计算确定MFR值，或者通过使用切割设备的测量确定MFR值，前提是测量精度至少与MVR测量的精度相同。ISO 1133-2:2011和ISO 1133-1之间的主要区别在于，ISO 1133-2:2011规定了气缸内温度和材料承受该温度的持续时间的更严格公差。因此，材料的时间-温度历史受到更严格的控制，因此，对于可能受到高温暴露影响的材料，与是否使用ISO 1133-1规范相比，试验结果的可变性降低。ISO 1133-2:2011还提供了制备和处理对获得可重复、可再现和准确数据至关重要的湿敏材料的信息。材料标准中通常规定了测量MVR和MFR的试验条件。但是，对于材料标准中未规定试验条件的材料，有必要在相关方之间商定试验条件

ISO 1133-2:2011 specifies a procedure for the determination of the melt volume-flow rate (MVR) and melt mass-flow rate (MFR) of thermoplastic materials that exhibit a high rheological sensitivity to the time-temperature history experienced by the sample during the test and/or to moisture.It is possible that this method will not be appropriate for materials whose rheological behaviour is extremely affected during testing.MFR values can be determined by calculation from MVR measurements provided the melt density at the test temperature and pressure is known, or by measurement using a cutting device provided that the accuracy of the measurement is at least the same as that of the MVR measurement.The primary difference between ISO 1133-2:2011 and ISO 1133-1 is that ISO 1133-2:2011 specifies tighter tolerances on the temperature in the cylinder and on the time duration over which the material is subjected to that temperature. Thus the time-temperature history of the material is more tightly controlled and consequently, for materials that are likely to be affected by exposure to elevated temperatures, the variability of test results is reduced compared with whether the specifications of ISO 1133-1 were used.ISO 1133-2:2011 also provides information for preparation and handling of moisture sensitive materials that again are critical to obtaining repeatable, reproducible and accurate data.The test conditions for measurement of the MVR and MFR are often specified in the material standard. However, for those materials where there are no test conditions specified in the material standard, it is necessary for the test conditions to be agreed between the interested parties

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