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Title: Small Particle Driven Chain Disentanglements in Polymer Nanocomposites

Abstract

Using neutron spin-echo spectroscopy, X-ray photon correlation spectroscopy and bulk rheology, we studied the effect of particle size on the single chain dynamics, particle mobility, and bulk viscosity in athermal polyethylene oxide-gold nanoparticle composites. The results reveal an ≈ 25 % increase in the reptation tube diameter with addition of nanoparticles smaller than the entanglement mesh size (≈ 5 nm), at a volume fraction of 20 %. The tube diameter remains unchanged in the composite with larger (20 nm) nanoparticles at the same loading. In both cases, the Rouse dynamics is insensitive to particle size. These results provide a direct experimental observation of particle size driven disentanglements that can cause non-Einstein-like viscosity trends often observed in polymer nanocomposites.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF); National Institute of Standards and Technology (NIST) - Center for Nanoscale Science and Technology (CNST)
OSTI Identifier:
1392526
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 118; Journal Issue: 14; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

Citation Formats

Senses, Erkan, Ansar, Siyam M., Kitchens, Christopher L., Mao, Yimin, Narayanan, Suresh, Natarajan, Bharath, and Faraone, Antonio. Small Particle Driven Chain Disentanglements in Polymer Nanocomposites. United States: N. p., 2017. Web. doi:10.1103/PhysRevLett.118.147801.
Senses, Erkan, Ansar, Siyam M., Kitchens, Christopher L., Mao, Yimin, Narayanan, Suresh, Natarajan, Bharath, & Faraone, Antonio. Small Particle Driven Chain Disentanglements in Polymer Nanocomposites. United States. doi:10.1103/PhysRevLett.118.147801.
Senses, Erkan, Ansar, Siyam M., Kitchens, Christopher L., Mao, Yimin, Narayanan, Suresh, Natarajan, Bharath, and Faraone, Antonio. Sat . "Small Particle Driven Chain Disentanglements in Polymer Nanocomposites". United States. doi:10.1103/PhysRevLett.118.147801.
@article{osti_1392526,
title = {Small Particle Driven Chain Disentanglements in Polymer Nanocomposites},
author = {Senses, Erkan and Ansar, Siyam M. and Kitchens, Christopher L. and Mao, Yimin and Narayanan, Suresh and Natarajan, Bharath and Faraone, Antonio},
abstractNote = {Using neutron spin-echo spectroscopy, X-ray photon correlation spectroscopy and bulk rheology, we studied the effect of particle size on the single chain dynamics, particle mobility, and bulk viscosity in athermal polyethylene oxide-gold nanoparticle composites. The results reveal an ≈ 25 % increase in the reptation tube diameter with addition of nanoparticles smaller than the entanglement mesh size (≈ 5 nm), at a volume fraction of 20 %. The tube diameter remains unchanged in the composite with larger (20 nm) nanoparticles at the same loading. In both cases, the Rouse dynamics is insensitive to particle size. These results provide a direct experimental observation of particle size driven disentanglements that can cause non-Einstein-like viscosity trends often observed in polymer nanocomposites.},
doi = {10.1103/PhysRevLett.118.147801},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 14,
volume = 118,
place = {United States},
year = {2017},
month = {4}
}

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