Nanorheology of Entangled Polymer Melts

Ge, Ting; Grest, Gary S.; Rubinstein, Michael

doi:10.1103/PhysRevLett.120.057801

Title: Nanorheology of Entangled Polymer Melts

Journal Article · 01 February 2018 · Physical Review Letters

DOI: https://doi.org/10.1103/PhysRevLett.120.057801 · OSTI ID:1430900

Ge, Ting ^[1]; Grest, Gary S. ^[2]; Rubinstein, Michael ^[1]

Univ. of North Carolina, Chapel Hill, NC (United States). Department of Chemistry
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

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 G_GSE(t) from the mean square displacement of NPs. G_GSE(t) for different NP diameters d are compared with the stress relaxation function G(t) of a pure polymer melt. The deviation of G_GSE(t) from G(t) reflects the incomplete coupling between NPs and the dynamic modes of the melt. For linear polymers, a plateau in G_GSE(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, G_GSE(t) approaches G(t) of the ring melt with no entanglement plateau.

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Research Organization:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)

Grant/Contract Number:: AC04-94AL85000; AC02-05CH11231; NA0003525

OSTI ID:: 1430900

Alternate ID(s):: OSTI ID: 1419116

Report Number(s):: SAND-2018-0707J; PRLTAO; 660141; TRN: US1802636

Journal Information:: Physical Review Letters, Vol. 120, Issue 5; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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