Shear flow behavior of a dynamically symmetric polymeric bicontinuous microemulsion

Ning Zhou; Frank S. Bates; Timothy P. Lodge; Wesley R. Burghardt

doi:10.1122/1.2750668

Shear flow behavior of a dynamically symmetric polymeric bicontinuous microemulsion

Ning Zhou, Frank S. Bates^*, Timothy P. Lodge, Wesley R. Burghardt

^*Corresponding author for this work

Chemical and Biological Engineering

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

We have investigated the shear flow behavior of a dynamically symmetric polymeric bicontinuous microemulsion using rheology and in situ small angle x-ray scattering. The microemulsion consists of a ternary blend of poly (ethylene-alt-propylene) (PEP), poly (butylene oxide) (PBO), and a PEP-PBO diblock copolymer. Steady shear experiments reveal an unusual shear thickening behavior at the onset of the non-Newtonian regime, which is consistent with the strain hardening and frequency thickening (at large strains) under oscillatory shear. Scattering experiments indicate development of anisotropy in the bicontinuous structure within the thickening regime. Subsequent shear thinning is observed at intermediate shear rates. Shear-induced bulk phase separation is detected at very high rates. This work complements previous studies on a dynamically extremely asymmetric bicontinuous microemulsion, and thereby establishes the universal rheological properties of polymeric microemulsions. Possible underlying molecular mechanisms for these rich rheological phenomena are discussed.

Original language	English (US)
Pages (from-to)	1027-1046
Number of pages	20
Journal	Journal of Rheology
Volume	51
Issue number	5
DOIs	https://doi.org/10.1122/1.2750668
State	Published - 2007

Funding

This work was supported primarily by the MRSEC program of the National Science Foundation under Award No. DMR-0212302. The authors thank David Giles for assistance with rheological measurements. X-ray experiments were conducted at the DuPont-Northwestern-Dow Collaborative Access Team (DND-CAT) Synchrotron Research Center located at Sector 5 of the Advanced Photon Source. The use of the Advanced Photon Source at Argonne National Labs was supported by the U.S. Department of Energy, Basic Energy Sciences, Office of Science, under Contract No. W-31-109-Eng-38.

Keywords

Polymeric bicontinuous microemulsion
Rheology
Shear thickening
Shear-induced phase separation

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1122/1.2750668

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title = "Shear flow behavior of a dynamically symmetric polymeric bicontinuous microemulsion",

abstract = "We have investigated the shear flow behavior of a dynamically symmetric polymeric bicontinuous microemulsion using rheology and in situ small angle x-ray scattering. The microemulsion consists of a ternary blend of poly (ethylene-alt-propylene) (PEP), poly (butylene oxide) (PBO), and a PEP-PBO diblock copolymer. Steady shear experiments reveal an unusual shear thickening behavior at the onset of the non-Newtonian regime, which is consistent with the strain hardening and frequency thickening (at large strains) under oscillatory shear. Scattering experiments indicate development of anisotropy in the bicontinuous structure within the thickening regime. Subsequent shear thinning is observed at intermediate shear rates. Shear-induced bulk phase separation is detected at very high rates. This work complements previous studies on a dynamically extremely asymmetric bicontinuous microemulsion, and thereby establishes the universal rheological properties of polymeric microemulsions. Possible underlying molecular mechanisms for these rich rheological phenomena are discussed.",

keywords = "Polymeric bicontinuous microemulsion, Rheology, Shear thickening, Shear-induced phase separation",

author = "Ning Zhou and Bates, {Frank S.} and Lodge, {Timothy P.} and Burghardt, {Wesley R.}",

note = "Funding Information: This work was supported primarily by the MRSEC program of the National Science Foundation under Award No. DMR-0212302. The authors thank David Giles for assistance with rheological measurements. X-ray experiments were conducted at the DuPont-Northwestern-Dow Collaborative Access Team (DND-CAT) Synchrotron Research Center located at Sector 5 of the Advanced Photon Source. The use of the Advanced Photon Source at Argonne National Labs was supported by the U.S. Department of Energy, Basic Energy Sciences, Office of Science, under Contract No. W-31-109-Eng-38. ",

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AU - Zhou, Ning

AU - Bates, Frank S.

AU - Lodge, Timothy P.

AU - Burghardt, Wesley R.

N1 - Funding Information: This work was supported primarily by the MRSEC program of the National Science Foundation under Award No. DMR-0212302. The authors thank David Giles for assistance with rheological measurements. X-ray experiments were conducted at the DuPont-Northwestern-Dow Collaborative Access Team (DND-CAT) Synchrotron Research Center located at Sector 5 of the Advanced Photon Source. The use of the Advanced Photon Source at Argonne National Labs was supported by the U.S. Department of Energy, Basic Energy Sciences, Office of Science, under Contract No. W-31-109-Eng-38.

PY - 2007

Y1 - 2007

N2 - We have investigated the shear flow behavior of a dynamically symmetric polymeric bicontinuous microemulsion using rheology and in situ small angle x-ray scattering. The microemulsion consists of a ternary blend of poly (ethylene-alt-propylene) (PEP), poly (butylene oxide) (PBO), and a PEP-PBO diblock copolymer. Steady shear experiments reveal an unusual shear thickening behavior at the onset of the non-Newtonian regime, which is consistent with the strain hardening and frequency thickening (at large strains) under oscillatory shear. Scattering experiments indicate development of anisotropy in the bicontinuous structure within the thickening regime. Subsequent shear thinning is observed at intermediate shear rates. Shear-induced bulk phase separation is detected at very high rates. This work complements previous studies on a dynamically extremely asymmetric bicontinuous microemulsion, and thereby establishes the universal rheological properties of polymeric microemulsions. Possible underlying molecular mechanisms for these rich rheological phenomena are discussed.

AB - We have investigated the shear flow behavior of a dynamically symmetric polymeric bicontinuous microemulsion using rheology and in situ small angle x-ray scattering. The microemulsion consists of a ternary blend of poly (ethylene-alt-propylene) (PEP), poly (butylene oxide) (PBO), and a PEP-PBO diblock copolymer. Steady shear experiments reveal an unusual shear thickening behavior at the onset of the non-Newtonian regime, which is consistent with the strain hardening and frequency thickening (at large strains) under oscillatory shear. Scattering experiments indicate development of anisotropy in the bicontinuous structure within the thickening regime. Subsequent shear thinning is observed at intermediate shear rates. Shear-induced bulk phase separation is detected at very high rates. This work complements previous studies on a dynamically extremely asymmetric bicontinuous microemulsion, and thereby establishes the universal rheological properties of polymeric microemulsions. Possible underlying molecular mechanisms for these rich rheological phenomena are discussed.

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KW - Shear-induced phase separation

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Shear flow behavior of a dynamically symmetric polymeric bicontinuous microemulsion

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