A novel experimental technique to study the rheological behavior of polymer melts and other viscous fluids in equibiaxial elongational deformations is described. The new technique is a modification of lubricated squeezing flow (LSF) wherein deformation is induced by compression of the sample between parallel plates having a thin film of a low-viscosity fluid or lubricant. In previous work, we have demonstrated that despite its simplicity, LSF is limited to rather small strains because of uncontrolled lubricant film thinning. The new technique, which we call continuous lubricated squeezing flow (CLSF), resolves the lubricant thinning problem by replenishing the lubricant films with a continuous and uniform flow of lubricant through porous plates. The CLSF technique is validated in constant strain-rate deformations by direct comparison with published data obtained using a considerably more complicated device developed by Meissner and co-workers [Hachmann, P., and J. Meissner, “Rheometer for equibiaxial and planar elongations of polymer melts,” J. Rheol. 47, 989–1010 (2003)].
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September 2010
Research Article|
September 01 2010
Continuous lubricated squeezing flow: A novel technique for equibiaxial elongational viscosity measurements on polymer melts
D. C. Venerus;
D. C. Venerus
a)
Department of Chemical and Biological Engineering, Center of Excellence in Polymer Science and Engineering,
Illinois Institute of Technology
, Chicago, Illinois 60616
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T.-Y. Shiu;
T.-Y. Shiu
Department of Chemical and Biological Engineering, Center of Excellence in Polymer Science and Engineering,
Illinois Institute of Technology
, Chicago, Illinois 60616
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T. Kashyap;
T. Kashyap
Department of Chemical and Biological Engineering, Center of Excellence in Polymer Science and Engineering,
Illinois Institute of Technology
, Chicago, Illinois 60616
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J. Hosttetler
J. Hosttetler
b)
Department of Materials, Polymer Physics,
ETH Zürich
, HCI H 543, CH-8093 Zürich, Switzerland
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a)
Author to whom correspondence should be addressed; electronic mail: [email protected]
b)
Retired.
J. Rheol. 54, 1083–1095 (2010)
Article history
Received:
March 23 2010
Citation
D. C. Venerus, T.-Y. Shiu, T. Kashyap, J. Hosttetler; Continuous lubricated squeezing flow: A novel technique for equibiaxial elongational viscosity measurements on polymer melts. J. Rheol. 1 September 2010; 54 (5): 1083–1095. https://doi.org/10.1122/1.3474599
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