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Title: Enhancing the Mechanical Properties of Glassy Nanocomposites by Tuning Polymer Molecular Weight

Abstract

The addition of nanoparticles to a polymer matrix is a well-known process to improve the mechanical properties of polymers. Many studies of mechanical reinforcement in polymer nanocomposites (PNCs) focus on rubbery matrices; however, much less effort concentrates on the factors controlling the mechanical performance of the technologically important glassy PNCs. This paper presents a study of the effect of the polymer molecular weight (MW) on the overall mechanical properties of glassy PNCs with attractive interaction by using Brillouin light scattering. We found that the mechanical moduli (bulk and shear) have a nonmonotonic dependence on MW that cannot be predicted by simple rule of mixtures. The moduli increase with increasing MW up to 100 kg/mol followed by a drop at higher MW. We demonstrate that the change in the mechanical properties of PNCs can be associated with the properties of the interfacial polymer layer. The latter depend on the interfacial chain packing and stretching, as well as polymer bridging, which vary differently with the MW of the polymer. These competing contributions lead to the observed nonmonotonic variations of the glassy PNC moduli with MW. Our work provides a simple, cost-effective, and efficient way to control the mechanical properties of glassy PNCsmore » by tuning the polymer chain length. Our finding can be beneficial for the rational design of PNCs with desired mechanical performance.« less

Authors:
ORCiD logo [1]; ORCiD logo [2];  [2]; ORCiD logo [2];  [3];  [4];  [5]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. de Montpellier (France)
  2. (United States); Univ. de Montpellier (France)
  3. Univ. of Tennessee, Knoxville, TN (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. (United States); Univ. de Montpellier (France); Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1476416
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
ACS Applied Materials and Interfaces
Additional Journal Information:
Journal Volume: 10; Journal Issue: 39; Journal ID: ISSN 1944-8244
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Genix, Anne-Caroline, Bocharova, Vera, Kisliuk, Alexander, Carroll, Bobby, Zhao, Sheng, Oberdisse, Julian, and Sokolov, Alexei P. Enhancing the Mechanical Properties of Glassy Nanocomposites by Tuning Polymer Molecular Weight. United States: N. p., 2018. Web. doi:10.1021/acsami.8b13109.
Genix, Anne-Caroline, Bocharova, Vera, Kisliuk, Alexander, Carroll, Bobby, Zhao, Sheng, Oberdisse, Julian, & Sokolov, Alexei P. Enhancing the Mechanical Properties of Glassy Nanocomposites by Tuning Polymer Molecular Weight. United States. doi:10.1021/acsami.8b13109.
Genix, Anne-Caroline, Bocharova, Vera, Kisliuk, Alexander, Carroll, Bobby, Zhao, Sheng, Oberdisse, Julian, and Sokolov, Alexei P. Tue . "Enhancing the Mechanical Properties of Glassy Nanocomposites by Tuning Polymer Molecular Weight". United States. doi:10.1021/acsami.8b13109. https://www.osti.gov/servlets/purl/1476416.
@article{osti_1476416,
title = {Enhancing the Mechanical Properties of Glassy Nanocomposites by Tuning Polymer Molecular Weight},
author = {Genix, Anne-Caroline and Bocharova, Vera and Kisliuk, Alexander and Carroll, Bobby and Zhao, Sheng and Oberdisse, Julian and Sokolov, Alexei P.},
abstractNote = {The addition of nanoparticles to a polymer matrix is a well-known process to improve the mechanical properties of polymers. Many studies of mechanical reinforcement in polymer nanocomposites (PNCs) focus on rubbery matrices; however, much less effort concentrates on the factors controlling the mechanical performance of the technologically important glassy PNCs. This paper presents a study of the effect of the polymer molecular weight (MW) on the overall mechanical properties of glassy PNCs with attractive interaction by using Brillouin light scattering. We found that the mechanical moduli (bulk and shear) have a nonmonotonic dependence on MW that cannot be predicted by simple rule of mixtures. The moduli increase with increasing MW up to 100 kg/mol followed by a drop at higher MW. We demonstrate that the change in the mechanical properties of PNCs can be associated with the properties of the interfacial polymer layer. The latter depend on the interfacial chain packing and stretching, as well as polymer bridging, which vary differently with the MW of the polymer. These competing contributions lead to the observed nonmonotonic variations of the glassy PNC moduli with MW. Our work provides a simple, cost-effective, and efficient way to control the mechanical properties of glassy PNCs by tuning the polymer chain length. Our finding can be beneficial for the rational design of PNCs with desired mechanical performance.},
doi = {10.1021/acsami.8b13109},
journal = {ACS Applied Materials and Interfaces},
number = 39,
volume = 10,
place = {United States},
year = {2018},
month = {9}
}

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Cited by: 4 works
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