Small Particle Driven Chain Disentanglements in Polymer Nanocomposites

Senses, Erkan; Ansar, Siyam M.; Kitchens, Christopher L.; Mao, Yimin; Narayanan, Suresh; Natarajan, Bharath; Faraone, Antonio

doi:10.1103/PhysRevLett.118.147801

Small Particle Driven Chain Disentanglements in Polymer Nanocomposites

Journal Article · Sat Apr 01 04:00:00 EDT 2017 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.118.147801· OSTI ID:1392526

Senses, Erkan; Ansar, Siyam M.; Kitchens, Christopher L.; Mao, Yimin; Narayanan, Suresh; Natarajan, Bharath; Faraone, Antonio

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.

Research Organization:: Argonne National Laboratory (ANL)

Sponsoring Organization:: USDOE Office of Science; National Science Foundation (NSF); National Institute of Standards and Technology (NIST) - Center for Nanoscale Science and Technology (CNST)

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1392526

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 14 Vol. 118; ISSN 0031-9007

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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