Threading–Unthreading Transition of Linear-Ring Polymer Blends in Extensional Flow

Borger, Anine; Wang, Wendi; O’Connor, Thomas C.; Ge, Ting; Grest, Gary S.; Jensen, Grethe V.; Ahn, Junyoung; Chang, Taihyun; Hassager, Ole; Mortensen, Kell; Vlassopoulos, Dimitris; Huang, Qian

doi:10.1021/acsmacrolett.0c00607

Threading–Unthreading Transition of Linear-Ring Polymer Blends in Extensional Flow

Journal Article · Fri Oct 02 00:00:00 EDT 2020 · ACS Macro Letters

DOI:https://doi.org/10.1021/acsmacrolett.0c00607· OSTI ID:1691444

Borger, Anine ^[1]; ^[2]; ^[3]; ^[4]; ^[3]; Jensen, Grethe V. ^[5]; Ahn, Junyoung ^[6]; ^[6]; ^[2]; ^[7]; ^[8]; ^[2]

Univ. of Copenhagen (Denmark)
Technical Univ. of Denmark, Lyngby (Denmark)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Univ. of South Carolina, Columbia, SC (United States)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research
Pohang Univ. of Science and Technology (POSTECH) (South Korea)
Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark
Foundation for Research and Technology Hellas (FORTH), Heraklion (Greece); Univ. of Crete, Heraklion (Greece)

Adding small amounts of ring polymers to a matrix of their linear counterparts is known to increase the zero-shear-rate viscosity because of linear-ring threading. Uniaxial extensional rheology measurements show that, unlike its pure linear and ring constituents, the blend exhibits an overshoot in the stress growth coefficient. By combining these measurements with ex-situ small-angle neutron scattering and nonequilibrium molecular dynamics simulations, this overshoot is shown here to be driven by a transient threading–unthreading transition of rings embedded within the linear entanglement network. Prior to unthreading, embedded rings deform affinely with the linear entanglement network and produce a measurably stronger elongation of the linear chains in the blend compared to the pure linear melt. Thus, rings uniquely alter the mechanisms of transient elongation in linear polymers.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: European Research Council (ERC); National Institute of Standards and Technology (NIST); National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000; NA0003525

OSTI ID:: 1691444

Report Number(s):: SAND--2020-10941J; 691282

Journal Information:: ACS Macro Letters, Journal Name: ACS Macro Letters Journal Issue: 10 Vol. 9; ISSN 2161-1653

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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