Adhesion hysteresis studies of extracted poly(dimethylsiloxane) using contact mechanics

Gun Young Choi, Soojin Kim, Abraham Ulman

Research output: Contribution to journalArticle

Abstract

We present results of adhesion studies of poly(dimethylsiloxane) (PDMS) crosslinked hemispheres, before and after extraction, carried out using contact mechanics (the JKR apparatus.) Three types of PDMS networks were prepared with increasing crosslinker-to-PDMS ratio (r= 1.7,2.2,2.7). Adhesion hysteresis was observed only after the PDMS hemispheres were extracted (toluene, Soxhlet, 20-24 h.) The size of hysteresis increased systematically with the decreasing ratio (increasing percentage of extracted weight. Brief extraction yielded smaller hysteresis, which disappeared after 12 days. It is concluded that the entanglement of tethered chains and their interdigitation with cross-linked PDMS network at the interface may be the dominating mechanisms for the observed adhesion hysteresis.

Original languageEnglish (US)
Pages (from-to)6333-6338
Number of pages6
JournalLangmuir
Volume13
Issue number23
DOIs
StatePublished - Nov 12 1997

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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