Accession Number:

ADA282165

Title:

Adherend Surface Effects on Epoxy Cure by NMR

Descriptive Note:

Final technical rept. Sep 1991-Sep 1993

Corporate Author:

CLARK UNIV WORCESTER MA

Personal Author(s):

Report Date:

1994-05-11

Pagination or Media Count:

12.0

Abstract:

A solid state NMR investigation is undertaken to characterize at the molecular level the structure and dynamic nature of epoxy resin systems cured in the presence of an active surface intended to represent an adherend surface. Comparison is made with the cure reaction in the bulk phase in the absence of a surface. This comparison focuses both on the different products and different kinetics which result from the presence of an active surface. The major system considered is that based on the diglycidyl ether of bisphenol A cured with primary amines, in particular 4,4 diaminodiphenyl sulfone. Aluminum oxide is used as a high surface area model of aluminum adherend surfaces. The NMR experiments utilize line narrowing techniques to yield resolved spectra of the solid materials. 13C and 15N NMR are used to identify the structures, with various relaxation experiments being employed to aid in the assignments and to characterize the mobility of the cured resin. This represents a new and powerful probe of surface adhesion and the understanding achieved can hopefully yield benefit in terms of improved understanding of adhesive joint performance. NMR, Epoxy, Adherence.

Subject Categories:

  • Organic Chemistry
  • Adhesives, Seals and Binders
  • Plastics
  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE