Nanorheology of Entangled Polymer Melts
Abstract
In this study, we use molecular simulations to probe the local viscoelasticity of an entangled polymer melt by tracking the motion of embedded nonsticky nanoparticles (NPs). As in conventional microrheology, the generalized Stokes-Einstein relation is employed to extract an effective stress relaxation function GGSE(t) from the mean square displacement of NPs. GGSE(t) for different NP diameters d are compared with the stress relaxation function G(t) of a pure polymer melt. The deviation of GGSE(t) from G(t) reflects the incomplete coupling between NPs and the dynamic modes of the melt. For linear polymers, a plateau in GGSE(t) emerges as d exceeds the entanglement mesh size a and approaches the entanglement plateau in G(t) for a pure melt with increasing d. For ring polymers, as d increases towards the spanning size R of ring polymers, GGSE(t) approaches G(t) of the ring melt with no entanglement plateau.
- Authors:
-
- Univ. of North Carolina, Chapel Hill, NC (United States). Department of Chemistry
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)
- OSTI Identifier:
- 1430900
- Alternate Identifier(s):
- OSTI ID: 1419116
- Report Number(s):
- SAND-2018-0707J
Journal ID: ISSN 0031-9007; PRLTAO; 660141; TRN: US1802636
- Grant/Contract Number:
- AC04-94AL85000; AC02-05CH11231; NA0003525
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 120; Journal Issue: 5; Journal ID: ISSN 0031-9007
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Ge, Ting, Grest, Gary S., and Rubinstein, Michael. Nanorheology of Entangled Polymer Melts. United States: N. p., 2018.
Web. doi:10.1103/PhysRevLett.120.057801.
Ge, Ting, Grest, Gary S., & Rubinstein, Michael. Nanorheology of Entangled Polymer Melts. United States. https://doi.org/10.1103/PhysRevLett.120.057801
Ge, Ting, Grest, Gary S., and Rubinstein, Michael. Thu .
"Nanorheology of Entangled Polymer Melts". United States. https://doi.org/10.1103/PhysRevLett.120.057801. https://www.osti.gov/servlets/purl/1430900.
@article{osti_1430900,
title = {Nanorheology of Entangled Polymer Melts},
author = {Ge, Ting and Grest, Gary S. and Rubinstein, Michael},
abstractNote = {In this study, we use molecular simulations to probe the local viscoelasticity of an entangled polymer melt by tracking the motion of embedded nonsticky nanoparticles (NPs). As in conventional microrheology, the generalized Stokes-Einstein relation is employed to extract an effective stress relaxation function GGSE(t) from the mean square displacement of NPs. GGSE(t) for different NP diameters d are compared with the stress relaxation function G(t) of a pure polymer melt. The deviation of GGSE(t) from G(t) reflects the incomplete coupling between NPs and the dynamic modes of the melt. For linear polymers, a plateau in GGSE(t) emerges as d exceeds the entanglement mesh size a and approaches the entanglement plateau in G(t) for a pure melt with increasing d. For ring polymers, as d increases towards the spanning size R of ring polymers, GGSE(t) approaches G(t) of the ring melt with no entanglement plateau.},
doi = {10.1103/PhysRevLett.120.057801},
journal = {Physical Review Letters},
number = 5,
volume = 120,
place = {United States},
year = {2018},
month = {2}
}
Web of Science
Figures / Tables:

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Works referencing / citing this record:
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