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Title: The role of nanoparticle rigidity on the diffusion of linear polystyrene in a polymer nanocomposite

Abstract

The impact of the inclusion of a nanoparticle in a polymer matrix on the dynamics of the polymer chains is an area of recent interest. In this article, we describe the role of nanoparticle rigidity or softness on the impact of the presence of that nanoparticle on the diffusive behavior of linear polymer chains. The neutron reflectivity results clearly show that the inclusion of 10 nm soft nanoparticles in a polymer matrix (Rg ~ 20 nm) increases the diffusion coefficient of the linear polymer chain. Surprisingly, thermal analysis shows that these nanocomposites exhibit an increase in their glass transition temperature, which is incommensurate with an increase in free volume. Therefore, it appears that this effect is more complex than a simple plasticizing effect. Results from small-angle neutron scattering of the nanoparticles in solution show a structure that consists of a gel like core with a corona of free chain ends and loops. Furthermore, the increase in linear polymer diffusion may be related to an increase in constraint release mechanisms in the reptation of the polymer chain, in a similar manner to that which has been reported for the diffusion of linear polymer chains in the presence of star polymers.

Authors:
 [1];  [1];  [2];  [1];  [3];  [3]
+ Show Author Affiliations
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1265981
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Macromolecules
Additional Journal Information:
Journal Volume: 48; Journal Issue: 22; Journal ID: ISSN 0024-9297
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Miller, Brad, Imel, Adam E., Holley, Wade, Baskaran, Durairaj, Mays, Jimmy W., and Dadmun, Mark D. The role of nanoparticle rigidity on the diffusion of linear polystyrene in a polymer nanocomposite. United States: N. p., 2015. Web. doi:10.1021/acs.macromol.5b01976.
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Miller, Brad, Imel, Adam E., Holley, Wade, Baskaran, Durairaj, Mays, Jimmy W., & Dadmun, Mark D. The role of nanoparticle rigidity on the diffusion of linear polystyrene in a polymer nanocomposite. United States. https://doi.org/10.1021/acs.macromol.5b01976
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Miller, Brad, Imel, Adam E., Holley, Wade, Baskaran, Durairaj, Mays, Jimmy W., and Dadmun, Mark D. Thu . "The role of nanoparticle rigidity on the diffusion of linear polystyrene in a polymer nanocomposite". United States. https://doi.org/10.1021/acs.macromol.5b01976. https://www.osti.gov/servlets/purl/1265981.
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@article{osti_1265981,
title = {The role of nanoparticle rigidity on the diffusion of linear polystyrene in a polymer nanocomposite},
author = {Miller, Brad and Imel, Adam E. and Holley, Wade and Baskaran, Durairaj and Mays, Jimmy W. and Dadmun, Mark D.},
abstractNote = {The impact of the inclusion of a nanoparticle in a polymer matrix on the dynamics of the polymer chains is an area of recent interest. In this article, we describe the role of nanoparticle rigidity or softness on the impact of the presence of that nanoparticle on the diffusive behavior of linear polymer chains. The neutron reflectivity results clearly show that the inclusion of 10 nm soft nanoparticles in a polymer matrix (Rg ~ 20 nm) increases the diffusion coefficient of the linear polymer chain. Surprisingly, thermal analysis shows that these nanocomposites exhibit an increase in their glass transition temperature, which is incommensurate with an increase in free volume. Therefore, it appears that this effect is more complex than a simple plasticizing effect. Results from small-angle neutron scattering of the nanoparticles in solution show a structure that consists of a gel like core with a corona of free chain ends and loops. Furthermore, the increase in linear polymer diffusion may be related to an increase in constraint release mechanisms in the reptation of the polymer chain, in a similar manner to that which has been reported for the diffusion of linear polymer chains in the presence of star polymers.},
doi = {10.1021/acs.macromol.5b01976},
journal = {Macromolecules},
number = 22,
volume = 48,
place = {United States},
year = {Thu Nov 12 00:00:00 EST 2015},
month = {Thu Nov 12 00:00:00 EST 2015}
}
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https://doi.org/10.1021/acs.macromol.5b01976
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    Works referencing / citing this record:

    Modeling of Entangled Polymer Diffusion in Melts and Nanocomposites: A Review
    journal, May 2019

    • Karatrantos, Argyrios; Composto, Russell J.; Winey, Karen I.
    • Polymers, Vol. 11, Issue 5
    • DOI: 10.3390/polym11050876

    Modeling of Entangled Polymer Diffusion in Melts and Nanocomposites: A Review
    text, January 2019

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