Accession Number:

ADA209428

Title:

A New Method for Monitoring Cure and Mobility in Epoxy Matrix and Fiber/ Epoxy Interphases

Descriptive Note:

Final rept.

Corporate Author:

CONNECTICUT UNIV STORRS INST OF MATERIALS SCIENCE

Personal Author(s):

Report Date:

1989-03-28

Pagination or Media Count:

3.0

Abstract:

The objective of this contract was to develop a new method based on reactive labelling technique for monitoring cure and mobility in epoxy matrix and fiberepoxy interphases. These reactive labels were chosen to exhibit spectral changes in the region of UV-visible and fluorescence spectra where the polymerizing matrix has little absorption or emission. In this method, we take advantage of the magnified effects of the substituent changes in the para and para prime positions of conjugated aromatic reactive labels on the UV-visible and fluorescence spectra. We have applied this method to characterize the kinetics and mechanisms of the cure in epoxy networks and in polyurethanes, the imidization process in polyimides, and the acylation in polyamides. One particular advantage of this method is that we can often distinguish between several cure species in some polymers. This advantage makes it possible to follow cure composition throughout the cure process and to analyze the kinetics and the mechanisms of several consecutive polymerization steps in some polymers. Keywords Cure monitoring, UV-VIS and fluorescence spectroscopy, Epoxy, Polyimide, Polyurethane, Polyamide, Reactive labelling Reaction kinetics Epoxy resins.

Subject Categories:

  • Polymer Chemistry
  • Plastics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE