A Methodology for Characterizing Reactive Coatings: Time-Temperature-Transformation (TTT) Analysis of the Competition Between Cure, Evaporation and Thermal Degradation for an Epoxy-Phenolic System
Abstract
A methodology, in terms of a macroscopic isothermal time-temperature- transformation (TTT) diagram, is presented for characterizing the changes which occur isothermally in a reactive thermosetting system in which evaporation, cure, and thermal degradation occur. Iso-weight loss contours show the progress of the loss of volatile material (mostly solvent). The gelation contour corresponds to the macroscopic viscosity rising to a definite level. The vitrification contour corresponds to the glass transition temperature (T sub g) rising to the temperature of cure. Iso-T sub g contours show the progress of cure in terms of the easily measured T sub g (rather than chemical conversion). The iso-T sub g contours also show the influence of thermal degradation competing with cure. Degradation is responsible for difficulties in assigning the glass transition temperature of the fully cured material. Keywords: Epoxy resins, Phenolic plastics, Plastic coatings.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1988
- Accession Number
- ADA197254
Entities
People
- John K. Gillham
- R. B. Prime
- S. Gan
Organizations
- Princeton University