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1.中国科学院长春应用化学研究所 高分子物理与化学国家重点实验室 长春 130022
2.中国科学技术大学应用化学与工程学院 合肥 230026
Published:3 April 2021,
Published Online:8 January 2021,
Received:14 October 2020,
Revised:3 December 2020,
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Shuang Liu, Xiao Cao, Jia-qi Zhang, Ying-chun Han, Xin-yue Zhao, Quan Chen. Toward Correct Measurements of Shear Rheometry. [J]. Acta Polymerica Sinica 52(4):406-422(2021)
Shuang Liu, Xiao Cao, Jia-qi Zhang, Ying-chun Han, Xin-yue Zhao, Quan Chen. Toward Correct Measurements of Shear Rheometry. [J]. Acta Polymerica Sinica 52(4):406-422(2021) DOI: 10.11777/j.issn1000-3304.2020.20230.
流变学是高分子加工和应用的重要基础,流变学表征对于深入理解高分子流动行为非常重要,获取的流变参数可用于指导高分子加工. 本文首先总结了剪切流变测试中的基本假设:(1)设置的应变施加在样品上,(2)应力来源于样品自身的响应和(3)施加的流场为纯粹的剪切流场;之后具体阐述了这些假设失效的情形和所导致的常见的实验错误;最后,通过结合一些实验实例具体说明如何培养良好的测试习惯和获得可靠的测试结果.
Rheology is an important tool for characterizing polymeric materials. The knowledge of polymer dynamics obtained from rheological measurements can guide the processing of polymeric materials. Nevertheless
it is a challenging task to conduct precise measurements on shear rheometers. First
we summarize the basic assumptions of rheological measurements: (1) the applied strain is on the sample
(2) the stress reflects sample’s own stress response
and (3) the flow field is purely the shear flow. Second
we highlight the conditions under which the above assumptions become invalid
which leads to incorrect measurements. For example
the first assumption is violated when compliance of the equipment or the wall-slip becomes non-negligible
the second assumption is violated when either inertia of the equipment
that of the sample
or the interfacial tension contributes non-negligibly to the overall torque
and the third assumption is violated when there is the secondary flow
shear-banding
or edge fracture. We show some examples of the incorrect measurements owing to these violations of the assumptions. Finally
we stress the importance of good experimental practice in rheological experiments.
流变学剪切流场剪切流变测试
RheologyShear flow fieldShear rheology measurement
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