The behaviour of trimethoxyvinylsilane on various substrates: An XPS study

AndrÁs TÓth, Imre BertÓti, GyÖrgy BÁnhegyi

Research output: Contribution to journalArticle

Abstract

Aluminum, epoxy resin and (untreated and air plasma treated) crosslinked polyethylene substrates were silanized with a trimethoxyvinylsilane (TVS) coupling agent, where the reaction conditions, like the relative humidity of the air, the durations of the hydrolytical and of the heat treat- ment steps were varied systematically. The stability of the bonds formed were tested by exposing the silanized surfaces to hot water vapour or heptane, and the chemical changes were monitored by XPS (ESCA). The amount of the deposited TVS increased for each substrate with the increase of the relative humidity and the time of conditioning. The coating on the Al surface was resistant to heptane soaking, but the overwhelming portion of the coupling agent could be removed by treatment with hot water vapour. This indicates the formation of predominantly ionic bonds between the TVS and the Al substrate. In contrast, the major portion of the coupling agent was removed from the surface of the epoxy resin by heptane and was not affected by hot water vapour. This suggests the coupling agent to be present mainly in condensed form not bound chemically to the epoxy surface. The crosslinked polyethylene exhibited a reproducible uptake of TVS only after oxidative plasma treatment. The plasma-treated polyethylene samples showed a behaviour intermediate between those of Al and epoxy resin: the surface Si-content of the silanized polyethylene decreased after treatments with both heptane or hot water vapour, with a more severe effect of the latter.

Original languageEnglish
Pages (from-to)291-306
Number of pages16
JournalComposite Interfaces
Volume2
Issue number4
DOIs
Publication statusPublished - Jan 1 1994

Keywords

  • Adhesion promoter
  • Aluminum
  • Coupling agent
  • Epoxy resin
  • Esca
  • Polyethylene
  • Trimethoxyvinylsilane
  • X-ray photoelectron spectroscopy
  • Xps

ASJC Scopus subject areas

  • Ceramics and Composites
  • Physics and Astronomy(all)
  • Surfaces, Coatings and Films

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