Structure and Properties of Polymer Interphases
Abstract
The molecular structure of interphases between polymer systems and metal substrates was determined by using x ray photoelectron spectroscopy (XPS), reflection absorption infrared spectroscopy (RAIR), and attenuated total reflection infrared spectroscopy (ATR) to characterize the failure surfaces of double cantilever beam adhesive joints prepared by curing beams of epoxies against metal beams. The structure of the interphases depended strongly on the curing agent, metal substrate, and use of a silane primer on the substrate. When joints were prepared by curing an epoxy with a tertiary amine curing agent at 75 C against a steel substrate primed with a dilute aqueous solution of y- aminopropyltriethoxy-silane (gamma-APS), there was little reaction between the primer and adhesive and failure occurred near the primer/adhesive interface. The interphase consisted of low molecular weight siloxane oligomers in which the amino groups formed bicarbonates with water and carbon dioxide absorbed from the atmosphere.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 1988
- Accession Number
- ADA200669
Entities
People
- F. James Boerio
Organizations
- University of Cincinnati