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Rheologica Acta

, Volume 37, Issue 5, pp 415–423 | Cite as

Fast flow behavior of highly entangled monodisperse polymers

1. Interfacial stick-slip transition of polybutadiene melts
  • Xiaoping Yang
  • Shi-Qing Wang
  • Adel Halasa
  • H. Ishida
ORIGINAL CONTRIBUTION

Abstract

A systematic experimental investigation is carried out to clarify the nature of a well-known capillary flow phenomenon in linear monodisperse polybutadienes (PBd). By varying the surface condition and the die diameter, it is alluded that a spurt-like stick-slip transition actually results from a breakdown of chain entanglement between adsorbed and next-layer unbound chains. In other words, the transition is not a manifestation of any constitutive properties, as previously asserted by Vinogradov and coworkers (1984). The melt viscosity dependence of the transition amplitude agrees with a Navier-de Gennes type analysis of wall slip. A comparison between the capillary flow and dynamic shear behavior of the same monodisperse PBd reveals that the interfacial stick-slip transition occurs at a stress level that is only a third of the plateau stress given by the elastic plateau modulus G N 0=1.0 MPa at 40°C. The molecular weight independence of the critical stress for the transition provides a striking contrast with the transition characteristics observed in linear polyethylenes and suggests a different state of PBd chain adsorption on steel surfaces.

Key words Interfacial stick-slip transition wall ship spurt flow 

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Copyright information

© Steinkopff Verlag 1998

Authors and Affiliations

  • Xiaoping Yang
    • 1
  • Shi-Qing Wang
    • 1
  • Adel Halasa
    • 2
  • H. Ishida
    • 1
  1. 1.Department of Macromolecular Science Case Western Reserve University Cleveland, Ohio 44106-7202, USA e-mail: sxw13@po.cwru.eduUS
  2. 2.Goodyear Research Center Akron, OH 44305, USAUS

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