THE WETTABILITY OF FLUOROCARBON AND CHLOROCARBON TRIALKOXYSILANE FILMS ADSORBED ON GLASS AND METAL SURFACE

Abstract

Adsorbed films having a wide range of wettabilities have been formed on silica, Pyrex, aluminosilicate, alpha-alumina, steel, and gold by trialkoxysilane (and trichlorosilane) compounds. These compounds had the general formulas RSi(OR')3 or RSiCl3, where R- was a fluorocarbon or a chlorocarbon group and -OR' was -OCH3 or -OCH2CH3. The fluorocarbon films had gamma values of <20 dynes/cm and water contact angles of 100 to 118 degrees. The chlorocarbon films had gamma values of >40 dynes/cm and water contact angles of 80 to 90 degrees. Film thickness, determined by ellipsometry, was consistently greater than a monolayer of the trialkoxysilane. Desorption experiments suggest that the films were composed of a polysiloxane network along with unhydrolyzed adsorbate, small polysiloxane molecules, and solvent. The fluorocarbon compounds have potential for forming oleophobic barrier films in lubricated devices.

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Document Details

Document Type
Technical Report
Publication Date
Dec 31, 1968
Accession Number
AD0683661

Entities

People

  • W. D. Bascom

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Alkanes
  • Chemical Synthesis
  • Chemistry
  • Films
  • Hydrocarbons
  • Lubricants
  • Materials Processing
  • Materials Science
  • Measurement
  • Molecules
  • Organosilicon Compounds
  • Polymeric Films
  • Polymers
  • Silica Glass
  • Silicon Compounds
  • Standards
  • Waveplates

Readers

  • Organic Chemistry
  • Surface Coatings Technology.
  • Thin Film Deposition Science.