Equibiaxial elongational deformations are omnipresent in polymer processing technologies. The challenge of generating well-controlled equibiaxial elongational deformations in the laboratory has, however, severely inhibited progress on understanding the rheology of polymeric liquids and other complex fluids in this flow. More recently, a novel technique known as continuous lubricated squeezing flow has been developed that allows for rheological measurements in equibiaxial elongational deformations. In the present study, we examine the rheological behavior of two entangled polyisobutylene (PIB) melts with different molecular weight distributions in constant strain rate equibiaxial elongation flows. These new data are compared with predictions from two molecular models for entangled polymer melts inspired by the idea that entanglements dominate the relaxation dynamics. One model is the discrete slip-link model (DSM), and the other is known as the Rolie Double Poly (RDP) model. For the PIB with a relatively narrow molecular weight distribution, the predictions of both models are in good agreement with experiments and the DSM gives nearly quantitative agreement. For the broad molecular weight distribution PIB, both the DSM and RDP model predict strain hardening, which is not observed in the experiments.
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Equibiaxial elongation of entangled polyisobutylene melts: Experiments and theoretical predictions
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Research Article|
March 29 2024
Equibiaxial elongation of entangled polyisobutylene melts: Experiments and theoretical predictions
Seyed Mahmoud Arzideh
;
Seyed Mahmoud Arzideh
1
Department of Chemical and Materials Engineering, New Jersey Institute of Technology
, Newark, New Jersey 07102
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Andrés Córdoba
;
Andrés Córdoba
2
Pritzker School of Molecular Engineering, University of Chicago
, 5640 South Ellis Avenue, Chicago, Illinois 60637
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Jeffrey G. Ethier
;
Jeffrey G. Ethier
3
Materials and Manufacturing Directorate, Air Force Research Laboratory
, Wright-Patterson Air Force Base, Ohio 45433
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Jay D. Schieber
;
Jay D. Schieber
4
Department of Chemical and Biological Engineering, Department of Physics, Department of Applied Mathematics, and Center for Molecular Study of Condensed Soft Matter, Illinois Institute of Technology
, 3440 South Dearborn Street, Chicago, Illinois 60616 and Pritzker School of Molecular Engineering, University of Chicago
, 5640 South Ellis Avenue, Chicago, Illinois 60637
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David C. Venerus
David C. Venerus
a)
1
Department of Chemical and Materials Engineering, New Jersey Institute of Technology
, Newark, New Jersey 07102a)Author to whom correspondence should be addressed; electronic mail: [email protected]
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a)Author to whom correspondence should be addressed; electronic mail: [email protected]
J. Rheol. 68, 341–353 (2024)
Article history
Received:
December 20 2023
Accepted:
March 08 2024
Citation
Seyed Mahmoud Arzideh, Andrés Córdoba, Jeffrey G. Ethier, Jay D. Schieber, David C. Venerus; Equibiaxial elongation of entangled polyisobutylene melts: Experiments and theoretical predictions. J. Rheol. 1 May 2024; 68 (3): 341–353. https://doi.org/10.1122/8.0000809
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