Measurement of relaxation times in extensional flow of weakly viscoelastic polymer solutions

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• 作者：Patrícia C. Sousa ; Emilio J. Vega ; Renato G. Sousa ; José M. Montanero…
• 关键词：Extensional relaxation time ; Viscoelastic fluid ; Uniaxial extension ; Elongational flow
• 刊名：Rheologica Acta
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：56
• 期：1
• 页码：11-20
• 全文大小：999KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Characterization and Evaluation of Materials; Polymer Sciences; Soft and Granular Matter, Complex Fluids and Microfluidics; Mechanical Engineering; Food Science;
• 出版者：Springer Berlin Heidelberg
• ISSN：1435-1528
• 卷排序：56

文摘

The characterization of the extensional rheology of polymeric solutions is important in several applications and industrial processes. Filament stretching and capillary breakup rheometers have been developed to characterize the extensional properties of polymeric solutions, mostly for high-viscosity fluids. However, for low concentration polymer solutions, the measurements are difficult using available devices, in terms of the minimum viscosity and relaxation times that can be measured accurately. In addition, when the slow retraction method is used, solvent evaporation can affect the measurements for volatile solvents. In this work, a new setup was tested for filament breakup experiments using the slow retraction method, high-speed imaging techniques, and an immiscible oil bath to reduce solvent evaporation and facilitate particle tracking in the thinning filament. Extensional relaxation times above around 100 μs were measured with the device for dilute and semi-dilute polymer solutions. Particle tracking velocimetry was also used to measure the velocity in the filament and the corresponding elongation rate, and to compare with the values obtained from the measured exponential decay of the filament diameter.