Wall Slip and Extrudate Distortion in Linear Low-Density Polyethylene

Douglass S. Kalika, Morton M. Denn

Research output: Contribution to journalArticlepeer-review

363 Scopus citations


The onset of extrudate distortion (sharkskin) in linear low-density polyethylene is shown to coincide with the failure of adhesion at the polymer/metal interface. The transition to slip—stick melt fracture is characterized by a catastrophic failure of adhesion, with periodic nearly complete slip over a capillary residence time alternating with adhesion. The onset of sharkskin is in agreement with a calculation based on a stability theory of Pearson and Petrie.

Original languageEnglish
Pages (from-to)815-834
Number of pages20
JournalJournal of Rheology
Issue number8
StatePublished - Nov 1987

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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