Accession Number : ADA130753

Title :   Structure and Properties of Polymers and Organosilanes Adsorbed Onto Oxidized Aluminum and Titanium.

Descriptive Note : Annual rept. no. 3, 1 Jul 82-30 Jun 83,

Corporate Author : CINCINNATI UNIV OH DEPT OF MATERIALS SCIENCE AND METALLURGICAL ENGINEERING

Personal Author(s) : Boerio,F James

PDF Url : ADA130753

Report Date : 15 Jul 1983

Pagination or Media Count : 37

Abstract : The molecular structure of thin films formed by gamma-aminopropyltriethoxy-silane (gamma-APS) adsorbed from aqueous solutions onto titanium, aluminum, and iron was determined and related to the properties of the films as primers for improving the wet strength of adhesive bonds between epoxy resins and titanium, aluminum, and iron adherends. Gamma-APS was adsorbed onto iron and titanium as hydrolyzed oligomers that condensed during drying to form polysiloxane films. The structure of the films was not significantly affected by the substrate or the pH of the gamma-APS solutions. Gamma-APS films were effective primers for improving the wet strength of titanium/epoxy and iron/epoxy lap joints. However, the properties of the films as primers depended strongly on the substrate and the pH of the solutions. It was concluded that the properties of the films depeneded more on the orientation of the gamma-APS molecules at the oxide surface than on the overall structure of the films. The orientation of the adsorbed gamma-APS molecules was determined by the pH of the solutions and by the isoelectric point of the oxides on titanium and iron. (author)

Descriptors :   *Adhesive bonding, *Aluminum, *Titanium, *Iron, *Polymers, *Silanes, Thermal stability, Coatings, Primers, Siloxanes, Epoxy resins, Oxides, Films, Molecular structure

Subject Categories : Polymer Chemistry
      Coatings, Colorants and Finishes
      Metallurgy and Metallography
      Fabrication Metallurgy
      Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE