Topological Linking Drives Anomalous Thickening of Ring Polymers in Weak Extensional Flows

O’Connor, Thomas C.; Ge, Ting; Rubinstein, Michael; Grest, Gary S.

doi:10.1103/PhysRevLett.124.027801

Topological Linking Drives Anomalous Thickening of Ring Polymers in Weak Extensional Flows

Journal Article · Sun Jan 12 23:00:00 EST 2020 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.124.027801· OSTI ID:1633724

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

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Duke Univ., Durham, NC (United States)

Molecular dynamics simulations confirm recent extensional flow experiments showing ring polymer melts exhibit strong extension-rate thickening of the viscosity at Weissenberg numbers Wi « 1. Thickening coincides with the extreme elongation of a minority population of rings that grows with Wi. The large susceptibility of some rings to extend is due to a flow-driven formation of topological links that connect multiple rings into supramolecular chains. Links form spontaneously with a longer delay at lower Wi and are pulled tight and stabilized by the flow. Once linked, these composite objects experience larger drag forces than individual rings, driving their strong elongation. The fraction of linked rings depends non-monotonically on Wi, increasing to a maximum when Wi 1 before rapidly decreasing when the strain rate approaches 1/T_e.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1633724

Report Number(s):: SAND2020--5909J; 686600

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 2 Vol. 124; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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