Wetting by simple room-temperature polymer melts: Deviations from Newtonian behavior

G. K. Seevaratnam, L. M. Walker, E. Ramé, S. Garoff

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


The hydrodynamics near moving contact lines of two room-temperature polymer melts, polyisobutylene (PIB) and polystyrene (PS), are different from those of a third polymer melt, polydimethylsiloxane (PDMS). While all three fluids exhibit Newtonian behavior in rotational rheological measurements, a model of the hydrodynamics near moving contact lines which assumes Newtonian behavior of the fluid accurately describes the interface shape of a variety of PDMS fluids but fails to describe the interface deformation by viscous forces in PIB and PS. The magnitude of the deviations from the model and the distance along the liquid-vapor interface over which they are seen increase with increasing capillary number. We conclude that the wetting behaviors of PIB and PS are influenced by weak elasticity in these low molecular weight melts and that dynamic wetting is more sensitive to this elasticity than standard rheometric techniques.

Original languageEnglish (US)
Pages (from-to)265-270
Number of pages6
JournalJournal of Colloid And Interface Science
Issue number1
StatePublished - Apr 1 2005
Externally publishedYes

Bibliographical note

Funding Information:
The authors acknowledge the support of NASA Grants NAG3-2449 and NNC04GA34G and a generous grant from the PPG Foundation for equipment. We thank Dr. Y. Suo for the data on xantham gum solutions.


  • Contact angle
  • Dynamic wetting
  • Non-Newtonian
  • Polymer melts


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