Elasticity and yielding of mesophases of block copolymers in water–oil mixtures
Abstract
Here, amphiphilic block copolymers self-assemble at the water/oil interface to form different mesomorphic structures, such as lamellar, micellar cubic, normal hexagonal, and reverse hexagonal structures. Usually, these structures are polycrystalline and the value of their elastic modulus depends on the average orientation of their constituent's single crystals. We introduce a model to predict the elastic modulus and yielding of mesophases from their characteristic length and intermicellar interactions. Shear modulus of each structure is measured as a function of deformation (strain). Zero-shear modulus, G0, depends on the inverse of the intermicellar distance with a power law model. The power law index for each structure is approximately n + 2 where n is the degree of confinement in the mesophase: 1 for lamellar, 2 for both normal and reverse hexagonal, and 3 for micellar cubic structures. Rheological properties of different mesophases of Pluronic P84 in the presence of water and p-xylene are used as a case study. The model is found to be in good agreement with experimental data in the linear viscoelastic region. When compared to experimental data, the yield strain value obtained from the model is one order of magnitude higher than the limit of the linear viscoelastic regime andmore »
- Authors:
-
[1];
[2];
[1]
- New Mexico State Univ., Las Cruces, NM (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1544743
- Alternate Identifier(s):
- OSTI ID: 1529680
- Report Number(s):
- LA-UR-19-23927
Journal ID: ISSN 1744-683X; SMOABF
- Grant/Contract Number:
- 89233218CNA000001
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Soft Matter
- Additional Journal Information:
- Journal Volume: 15; Journal Issue: 28; Journal ID: ISSN 1744-683X
- Publisher:
- Royal Society of Chemistry
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Qavi, Sahar, Firestone, Millicent A., and Foudazi, Reza. Elasticity and yielding of mesophases of block copolymers in water–oil mixtures. United States: N. p., 2019.
Web. doi:10.1039/C8SM02336K.
Qavi, Sahar, Firestone, Millicent A., & Foudazi, Reza. Elasticity and yielding of mesophases of block copolymers in water–oil mixtures. United States. https://doi.org/10.1039/C8SM02336K
Qavi, Sahar, Firestone, Millicent A., and Foudazi, Reza. Fri .
"Elasticity and yielding of mesophases of block copolymers in water–oil mixtures". United States. https://doi.org/10.1039/C8SM02336K. https://www.osti.gov/servlets/purl/1544743.
@article{osti_1544743,
title = {Elasticity and yielding of mesophases of block copolymers in water–oil mixtures},
author = {Qavi, Sahar and Firestone, Millicent A. and Foudazi, Reza},
abstractNote = {Here, amphiphilic block copolymers self-assemble at the water/oil interface to form different mesomorphic structures, such as lamellar, micellar cubic, normal hexagonal, and reverse hexagonal structures. Usually, these structures are polycrystalline and the value of their elastic modulus depends on the average orientation of their constituent's single crystals. We introduce a model to predict the elastic modulus and yielding of mesophases from their characteristic length and intermicellar interactions. Shear modulus of each structure is measured as a function of deformation (strain). Zero-shear modulus, G0, depends on the inverse of the intermicellar distance with a power law model. The power law index for each structure is approximately n + 2 where n is the degree of confinement in the mesophase: 1 for lamellar, 2 for both normal and reverse hexagonal, and 3 for micellar cubic structures. Rheological properties of different mesophases of Pluronic P84 in the presence of water and p-xylene are used as a case study. The model is found to be in good agreement with experimental data in the linear viscoelastic region. When compared to experimental data, the yield strain value obtained from the model is one order of magnitude higher than the limit of the linear viscoelastic regime and close to the strain at the cross-over point of storage and loss moduli. Frequency sweep measurements are done to characterize the relaxation and cooperative model behaviors of each mesophase structure.},
doi = {10.1039/C8SM02336K},
journal = {Soft Matter},
number = 28,
volume = 15,
place = {United States},
year = {Fri Jun 14 00:00:00 EDT 2019},
month = {Fri Jun 14 00:00:00 EDT 2019}
}
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Works referencing / citing this record:
Rheological characteristics of mesophases of block copolymer solutions
journal, July 2019
- Qavi, Sahar; Foudazi, Reza
- Rheologica Acta, Vol. 58, Issue 8
Polymerization in soft nanoconfinement of lamellar and reverse hexagonal mesophases
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