TY - JOUR
T1 - Mechanical properties of polymeric microfiltration membranes
AU - Elele, Ezinwa
AU - Shen, Yueyang
AU - Tang, John
AU - Lei, Qian
AU - Khusid, Boris
AU - Tkacik, Gabriel
AU - Carbrello, Christina
N1 - Funding Information:
The work was supported by theUS National Science Foundation [grant numbers IIP 1034710, 1822130] Industry/University Cooperative Research Center for Membrane Science, Engineering and Technology Center (MAST). The authors are grateful to Dr. Ramana Susarla and Dana Qasem, New Jersey Institute of Technology, for participation in testing membrane properties. The authors benefited from discussions with Dr. Kamalesh K. Sirkar, New Jersey Institute of Technology, and Dr. Alan R. Greenberg, University of Colorado Boulder.
Funding Information:
The work was supported by the US National Science Foundation [grant numbers IIP 1034710 , 1822130 ] Industry/University Cooperative Research Center for Membrane Science, Engineering and Technology Center (MAST) . The authors are grateful to Dr. Ramana Susarla and Dana Qasem, New Jersey Institute of Technology, for participation in testing membrane properties. The authors benefited from discussions with Dr. Kamalesh K. Sirkar, New Jersey Institute of Technology, and Dr. Alan R. Greenberg, University of Colorado Boulder.
Publisher Copyright:
© 2019
PY - 2019/12/1
Y1 - 2019/12/1
N2 - The influence of the pore topology and polymer properties on mechanical characteristics of asymmetric polyethersulfone (PES) and symmetric polyvinylidene fluoride (PVDF) microfiltration membranes was investigated by conducting elongation, creep, stress relaxation, small-amplitude oscillatory and bubble point pressure tests. The main aspects of the membrane stress-strain curves were found to be similar despite significant differences in the pore topology and polymer properties. While the Kelvin-Voigt model for solid polymers described the membrane viscoelastic response below the transition to ductile yielding, the stress-strain curves of membranes and solid polymers above the yield point appeared to be drastically different. All tested membranes demonstrated weak strain hardening, low sensitivity to strain rate, significant elastic recovery, stress relaxation and reduction of the bubble point pressure with accumulation of plastic deformation. Therefore, tensile stresses exerted on a membrane under assembling and process conditions should be smaller than the yield stress to assure that they will not impair filter performance. The novelty of our approach is the use of models for perforated plates to evaluate membrane mechanical properties as ductile yielding for both proceeds via localized plastic deformation around pores. Presented results provide a reliable framework for development of membranes with properties tailored to applications.
AB - The influence of the pore topology and polymer properties on mechanical characteristics of asymmetric polyethersulfone (PES) and symmetric polyvinylidene fluoride (PVDF) microfiltration membranes was investigated by conducting elongation, creep, stress relaxation, small-amplitude oscillatory and bubble point pressure tests. The main aspects of the membrane stress-strain curves were found to be similar despite significant differences in the pore topology and polymer properties. While the Kelvin-Voigt model for solid polymers described the membrane viscoelastic response below the transition to ductile yielding, the stress-strain curves of membranes and solid polymers above the yield point appeared to be drastically different. All tested membranes demonstrated weak strain hardening, low sensitivity to strain rate, significant elastic recovery, stress relaxation and reduction of the bubble point pressure with accumulation of plastic deformation. Therefore, tensile stresses exerted on a membrane under assembling and process conditions should be smaller than the yield stress to assure that they will not impair filter performance. The novelty of our approach is the use of models for perforated plates to evaluate membrane mechanical properties as ductile yielding for both proceeds via localized plastic deformation around pores. Presented results provide a reliable framework for development of membranes with properties tailored to applications.
KW - Bubble point pressure
KW - Microfiltration membranes
KW - Plastic deformation
KW - Stress-strain response
KW - Tensile tests
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U2 - 10.1016/j.memsci.2019.117351
DO - 10.1016/j.memsci.2019.117351
M3 - Article
AN - SCOPUS:85070320424
SN - 0376-7388
VL - 591
JO - Journal of Membrane Science
JF - Journal of Membrane Science
M1 - 117351
ER -