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

Publikation: Bidrag til tidsskriftTidsskriftartikelfagfællebedømt

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

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 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.

OriginalsprogEngelsk
TidsskriftACS Macro Letters
Vol/bind9
Udgave nummer10
Sider (fra-til)1452-1457
Antal sider6
ISSN2161-1653
DOI
StatusUdgivet - 20 okt. 2020

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