Accession Number:

ADA200669

Title:

Structure and Properties of Polymer Interphases

Descriptive Note:

Annual rept. no. 3, 1 Jul 1987-30 Jun 1988

Corporate Author:

CINCINNATI UNIV OH DEPT OF MATERIALS SCIENCE AND ENGINEERING

Personal Author(s):

Report Date:

1988-09-30

Pagination or Media Count:

39.0

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 primeradhesive 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.

Subject Categories:

  • Organic Chemistry
  • Polymer Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE