Cross-Linking in Shear-Thickening Ionomers

T. A. Witten, Morrel H. Cohen

Research output: Contribution to journalArticle

169 Scopus citations

Abstract

Ionic groups attached at wide intervals along nonpolar polymer chains produce strong associating interactions in solution. In certain cases, such solutions exhibit shear thickening; the viscosity increases with the flow rate. We sketch a mechanism for shear thickening in which the flow produces increased association between chains at the expense of associations within a chain. We calculate in a mean-field approximation how chain elongation produced by flow alters the balance between intra- and interchain associations. The effect is sufficiently large to account qualitatively for the observed dependence of viscosity on shear rate and on concentration. Surprisingly, the effect is maximized when the number of associating groups per chain is kept small.

Original languageEnglish (US)
Pages (from-to)1915-1918
Number of pages4
JournalMacromolecules
Volume18
Issue number10
DOIs
StatePublished - Jan 1 1985
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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