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SUMMARY:Keynote 6 - Nonlinear rheology of polydisperse blends of entangled
  linear polymers: Rolie-Double-Poly models
DTSTART;VALUE=DATE-TIME:20181211T095000Z
DTEND;VALUE=DATE-TIME:20181211T103000Z
DTSTAMP;VALUE=DATE-TIME:20260523T191816Z
UID:indico-contribution-487@lindico453.srv.lu.se
DESCRIPTION:Speakers: Daniel Read (Department of Applied Mathematics\, Uni
 versity of Leeds\, UK)\nWhilst there has been much success in modeling the
  linear and nonlinear rheology of monodisperse entangled linear polymers\,
  progress in the constitutive modeling of polymeric materials continues to
  lag behind the needs of industry. Industrially sourced polymers are typic
 ally polydisperse (comprising a broad distribution of molecular weights)\,
  making their rheology more suitable for processing but also more difficul
 t to predict. To date\, there are no molecular-based constitutive models t
 hat are practically suitable for describing industrially relevant polymers
  in industrially relevant flows. We extend but strongly simplify the Read 
 et al. model [Read et al.\, J.Rheol. 56\, 823-873 (2012)]\, which is able 
 to predict the linear and nonlinear rheology of bidisperse blends but is p
 rohibitively complex for industrial use. We propose a pair of simplified t
 ube models for polydisperse melts of entangled linear polymers that combin
 e the success of the double reptation approximation [des Cloizeaux\, Europ
 hys. Lett. 5\, 437-442 (1988)] in the linear regime with the success of th
 e Rolie-Poly constitutive equation [Likhtman et al.\, J. Non-Newton. Fluid
  Mech.114\, 1-12 (2003)] in the nonlinear regime. For binary blends\, We s
 how that these models naturally identify the effects from couplings betwee
 n constraint release and chain retraction (i.e. the so-called "enhanced st
 retch relaxation time"). We generalize to a multi-component (polydisperse)
  model\, based on the same underlying principles. Both of our models are i
 n qualitative\, and largely quantitative\, agreement with experimental dat
 a for bidisperse and polydisperse melts of entangled linear polymers.\n\nh
 ttps://lindico453.srv.lu.se/event/67/contributions/487/
LOCATION:Elite Hotel Ideon Tera
URL:https://lindico453.srv.lu.se/event/67/contributions/487/
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