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Title: Focus: Structure and dynamics of the interfacial layer in polymer nanocomposites with attractive interactions

Abstract

In recent years it has become clear that the interfacial layer formed around nanoparticles in polymer nanocomposites (PNCs) is critical for controlling their macroscopic properties. The interfacial layer occupies a significant volume fraction of the polymer matrix in PNCs and creates strong intrinsic heterogeneity in their structure and dynamics. In this paper, we focus on analysis of the structure and dynamics of the interfacial region in model PNCs with well-dispersed, spherical nanoparticles with attractive interactions. First, we discuss several experimental techniques that provide structural and dynamic information on the interfacial region in PNCs. Then, we discuss the role of various microscopic parameters in controlling structure and dynamics of the interfacial layer. The analysis presented emphasizes the importance of the polymer-nanoparticle interactions for the slowing down dynamics in the interfacial region, while the thickness of the interfacial layer appears to be dependent on chain rigidity, and has been shown to increase with cooling upon approaching the glass transition. Aside from chain rigidity and polymer-nanoparticle interactions, the interfacial layer properties are also affected by the molecular weight of the polymer and the size of the nanoparticles. Finally, in the last part of this focus article, we emphasize the important challenges in themore » field of polymer nanocomposites and a potential analogy with the behavior observed in thin films.« less

Authors:
ORCiD logo [1];  [2];  [1];  [3]; ORCiD logo [3]; ORCiD logo [4]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division
  2. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences. Computer Science and Mathematics Division
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1376456
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 146; Journal Issue: 20; Journal ID: ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Polymers; Nanoparticles; Interfacial properties; Interface dynamics; Nanocomposites

Citation Formats

Cheng, Shiwang, Carroll, Bobby, Bocharova, Vera, Carrillo, Jan-Michael, Sumpter, Bobby G., and Sokolov, Alexei P. Focus: Structure and dynamics of the interfacial layer in polymer nanocomposites with attractive interactions. United States: N. p., 2017. Web. doi:10.1063/1.4978504.
Cheng, Shiwang, Carroll, Bobby, Bocharova, Vera, Carrillo, Jan-Michael, Sumpter, Bobby G., & Sokolov, Alexei P. Focus: Structure and dynamics of the interfacial layer in polymer nanocomposites with attractive interactions. United States. doi:10.1063/1.4978504.
Cheng, Shiwang, Carroll, Bobby, Bocharova, Vera, Carrillo, Jan-Michael, Sumpter, Bobby G., and Sokolov, Alexei P. Thu . "Focus: Structure and dynamics of the interfacial layer in polymer nanocomposites with attractive interactions". United States. doi:10.1063/1.4978504. https://www.osti.gov/servlets/purl/1376456.
@article{osti_1376456,
title = {Focus: Structure and dynamics of the interfacial layer in polymer nanocomposites with attractive interactions},
author = {Cheng, Shiwang and Carroll, Bobby and Bocharova, Vera and Carrillo, Jan-Michael and Sumpter, Bobby G. and Sokolov, Alexei P.},
abstractNote = {In recent years it has become clear that the interfacial layer formed around nanoparticles in polymer nanocomposites (PNCs) is critical for controlling their macroscopic properties. The interfacial layer occupies a significant volume fraction of the polymer matrix in PNCs and creates strong intrinsic heterogeneity in their structure and dynamics. In this paper, we focus on analysis of the structure and dynamics of the interfacial region in model PNCs with well-dispersed, spherical nanoparticles with attractive interactions. First, we discuss several experimental techniques that provide structural and dynamic information on the interfacial region in PNCs. Then, we discuss the role of various microscopic parameters in controlling structure and dynamics of the interfacial layer. The analysis presented emphasizes the importance of the polymer-nanoparticle interactions for the slowing down dynamics in the interfacial region, while the thickness of the interfacial layer appears to be dependent on chain rigidity, and has been shown to increase with cooling upon approaching the glass transition. Aside from chain rigidity and polymer-nanoparticle interactions, the interfacial layer properties are also affected by the molecular weight of the polymer and the size of the nanoparticles. Finally, in the last part of this focus article, we emphasize the important challenges in the field of polymer nanocomposites and a potential analogy with the behavior observed in thin films.},
doi = {10.1063/1.4978504},
journal = {Journal of Chemical Physics},
issn = {0021-9606},
number = 20,
volume = 146,
place = {United States},
year = {2017},
month = {3}
}

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