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Title: Chain dynamics and nanoparticle motion in attractive polymer nanocomposites subjected to large deformations

The effect of large deformation on the chain dynamics in attractive polymer nanocomposites was investigated using neutron scattering techniques. Quasielastic neutron backscattering measurements reveal a substantial reduction of polymer mobility in the presence of attractive, well-dispersed nanoparticles. Additionally, large deformations are observed to cause a further slowing down of the Rouse rates at high particle loadings, where the interparticle spacings are slightly smaller than the chain dimensions, i.e. in the strongly confined state. No noticeable change, however, was observed for a lightly confined system. The reptation tube diameter, measured by neutron spin echo, remained unchanged after shear, suggesting that the level of chain-chain entanglements is not significantly affected. The shearinduced changes in the interparticle bridging reflects on the slow nanoparticle motion measured by X-ray photon correlation spectroscopy. These results provide a first step for understanding how large shear can significantly affect the segmental motion in nanocomposites and open up new opportunities for designing mechanically responsive soft materials.
Authors:
ORCiD logo [1] ;  [1] ;  [2] ;  [3] ;  [4]
  1. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research; Univ. of Maryland, College Park, MD (United States)
  2. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
  4. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Soft Matter
Additional Journal Information:
Journal Volume: 13; Journal Issue: 43; Journal ID: ISSN 1744-683X
Publisher:
Royal Society of Chemistry
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
National Science Foundation (NSF); USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1427470

Senses, Erkan, Tyagi, Madhusudan, Natarajan, Bharath, Narayanan, Suresh, and Faraone, Antonio. Chain dynamics and nanoparticle motion in attractive polymer nanocomposites subjected to large deformations. United States: N. p., Web. doi:10.1039/C7SM01009E.
Senses, Erkan, Tyagi, Madhusudan, Natarajan, Bharath, Narayanan, Suresh, & Faraone, Antonio. Chain dynamics and nanoparticle motion in attractive polymer nanocomposites subjected to large deformations. United States. doi:10.1039/C7SM01009E.
Senses, Erkan, Tyagi, Madhusudan, Natarajan, Bharath, Narayanan, Suresh, and Faraone, Antonio. 2017. "Chain dynamics and nanoparticle motion in attractive polymer nanocomposites subjected to large deformations". United States. doi:10.1039/C7SM01009E. https://www.osti.gov/servlets/purl/1427470.
@article{osti_1427470,
title = {Chain dynamics and nanoparticle motion in attractive polymer nanocomposites subjected to large deformations},
author = {Senses, Erkan and Tyagi, Madhusudan and Natarajan, Bharath and Narayanan, Suresh and Faraone, Antonio},
abstractNote = {The effect of large deformation on the chain dynamics in attractive polymer nanocomposites was investigated using neutron scattering techniques. Quasielastic neutron backscattering measurements reveal a substantial reduction of polymer mobility in the presence of attractive, well-dispersed nanoparticles. Additionally, large deformations are observed to cause a further slowing down of the Rouse rates at high particle loadings, where the interparticle spacings are slightly smaller than the chain dimensions, i.e. in the strongly confined state. No noticeable change, however, was observed for a lightly confined system. The reptation tube diameter, measured by neutron spin echo, remained unchanged after shear, suggesting that the level of chain-chain entanglements is not significantly affected. The shearinduced changes in the interparticle bridging reflects on the slow nanoparticle motion measured by X-ray photon correlation spectroscopy. These results provide a first step for understanding how large shear can significantly affect the segmental motion in nanocomposites and open up new opportunities for designing mechanically responsive soft materials.},
doi = {10.1039/C7SM01009E},
journal = {Soft Matter},
number = 43,
volume = 13,
place = {United States},
year = {2017},
month = {9}
}