The Ductless Siphon: A Useful Test for Evaluating Dilute Polymer Solution Elongational Behavior. Consistency with Molecular Theory and Parameters
The Ductless Siphon: A Useful Test for Evaluating Dilute Polymer Solution Elongational Behavior. Consistency with Molecular Theory and Parameters
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无管虹吸管：评估稀聚合物溶液伸长行为的有用测试。
DOI：
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发表时间：
1983
期刊：
影响因子：
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通讯作者：
Michael C. Williams
中科院分区：
文献类型：
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作者：
K. K. Chao;Michael C. Williams
无支撑液柱通过空气从静止的水池上升到有吸力的毛细管(“无管虹吸”)可以用几种溶剂和聚合物稀溶液的拉伸粘度(η)来解释。虹吸上升的最大高度(h*)被用来表征比率η/η，其中η是剪切粘度，近似流体力学分析表明η/η∼(h*)2。对甲苯和喷气燃料(煤油)中的聚异丁烯、喷气燃料中的专有抗雾剂PX以及水中的聚环氧乙烷和聚丙烯酰胺的测量表明，h*取决于η/η的稀溶液理论所预测的分子变量。聚合物相对分子质量范围为0.8×106；mV<；7.4×106，浓度范围为0<；c<；3000 wppm。这种简单的仪器的主要应用是质量控制、现场测试和聚合物体系的快速候选筛选，这些体系的性能敏感地依赖于分子质量的最高-M部分。
The rise of an unsupported liquid column through the air from a quiescent pool to a capillary with suction (the “ductless siphon”) is interpreted approximately in terms of the elongational viscosity (η) of several solvents and dilute polymer solutions. The maximum height of siphon rise (h*) is used to characterize the ratio η/η, where η is shear viscosity, and an approximate hydrodynamic analysis shows η/η∼(h*)2. Measurements made for polyisobutylenes in toluene and jet fuel (kerosene), for a proprietary antimisting agent PX in jet fuel, and for polyethylene oxide and polyacrylamides in water show that h* depends on molecular variables as predicted by dilute‐solution theories for η/η. Polymer molecular weight range is 0.8×106<Mv<7.4×106 and concentration range is 0<c<3000 wppm. A major application for this simple apparatus is seen for quality control, field testing, and rapid candidate screening of polymer systems whose properties depend sensitively on the highest‐M fraction of the molecular weight d...