Molecular Weight Effects in Chain Pullout

Costantino Creton*, Hugh R. Brown, Kenneth R. Shull

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

114 Scopus citations

Abstract

We have shown that the addition of polyisoprene (PI) tethered chains to a polystyrene (PS) substrate produces a large increase in its adhesion to a PI cross-linked lens over the whole range of crack speeds (10−10–10−7m/s) that we have investigated. Such an increase cannot be explained by the rate dependence of bulk viscoelastic losses and is believed to be due to the viscous pullout of the PI chains from the network. At low crack speeds the fracture toughness of the interface Gc was found to increase linearly with velocity from a threshold value G0. At higher crack speeds a transition occurred, after which the fracture toughness increased at a much lower rate which could be attributed to viscoelastic bulk losses. The threshold toughness G0 increased monotonically with both the areal density of tethered chains and their degree of polymerization. The results are compared with existing models of interfacial failure by chain pullout. The measured rate of increase of Gc with V implies there is a very high effective friction at very low pullout rates. This high friction is probably related to the very long time constant for a chain within a network.

Original languageEnglish (US)
Pages (from-to)3174-3183
Number of pages10
JournalMacromolecules
Volume27
Issue number12
DOIs
StatePublished - Jun 1 1994

ASJC Scopus subject areas

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

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