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Title: 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 » 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.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1]
+ Show Author Affiliations
  1. New Mexico State Univ., Las Cruces, NM (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (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.
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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
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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.
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@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 = {2019},
month = {6}
}
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https://doi.org/10.1039/C8SM02336K
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    Works referencing / citing this record:

    Rheological characteristics of mesophases of block copolymer solutions
    journal, July 2019

    Polymerization in soft nanoconfinement of lamellar and reverse hexagonal mesophases
    journal, January 2019

    • Qavi, Sahar; Bandegi, Alireza; Firestone, Millicent
    • Soft Matter, Vol. 15, Issue 41
    • DOI: 10.1039/c9sm01565e
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