Detecting extensional viscosity of polypropylene melt using the Rheotens test: A comparison between standard and steady state test modes
Detecting extensional viscosity of polypropylene melt using the Rheotens test: A comparison between standard and steady state test modes
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使用 Rheotens 测试检测聚丙烯熔体的拉伸粘度：标准测试模式与稳态测试模式之间的比较
DOI：
10.1016/j.polymertesting.2013.09.001
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发表时间：
2013-12
期刊：
影响因子：
5.1
通讯作者：
Han-Xiong Huang
中科院分区：
文献类型：
--
作者：
Quan-Jie Wang;Han-Xiong Huang
使用Rheotens测试来确定聚丙烯（PP）熔体在三种不同挤出速度和使用具有不同长径比的两个毛细管下的拉伸粘度。结果表明，在标准Rheotens试验中，不同试验条件下测定的拉伸粘度曲线存在明显差异，特别是在低拉伸应变速率下。这是由于在毛细管中发生的大分子链的预取向。因此，初步提出了稳态Rheotens试验。结果表明，在大多数测试条件下，由该测试模式确定的拉伸粘度曲线几乎重叠，这归因于这样一个事实，即在毛细管出口附近的链的预取向充分松弛。这意味着在较宽的挤出速度和毛细管长径比范围内可以获得等效拉伸粘度。此外，在稳态Rheotens测试中确定的等效拉伸粘度与使用Cogswell收敛流方法确定的外推拉伸粘度曲线表现出良好的一致性。
The Rheotens test was used to determine the extensional viscosity of a polypropylene (PP) melt at three different extrusion velocities and using two capillaries with different length-to-diameter ratios. Results showed that, in the standard Rheotens test, the extensional viscosity curves determined under different testing conditions exhibit an obvious difference, especially under low extensional strain rates. This is attributed to the pre-orientation of macromolecular chains taking place in the capillary. Hence, a steady state Rheotens test was tentatively proposed. It was demonstrated that the extensional viscosity curves determined under most of the testing conditions by this test mode almost overlap, which is attributed to the fact that the pre-orientation of chains relaxes sufficiently near the capillary exit. This implies that equivalent extensional viscosities can be obtained under a wider range of extrusion velocities and capillary length-to-diameter ratios. Moreover, the equivalent extensional viscosities determined in the steady state Rheotens test exhibit good agreement with the extrapolated extensional viscosity curve determined using the Cogswell convergent flow method.
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