Detection of Incompletely Reacted Curing Agent in Epoxy/Glass Laminates Using Uv-Fluorescent Staining Agents
Original Publication Date: 1986-Nov-01
Included in the Prior Art Database: 2005-Mar-09
Staining with a UV (ultraviolet)-fluorescent agent is used as a technique to detect the distribution of the incompletely reacted curing agent within an epoxy prepreg. The information obtained indicates a correlation between the presence of the agent crystals and voids. In addition, a possible mechanism accounting for the relatively weak adhesion strengths at the epoxy/glass interfaces is suggested. The epoxy prepreg is usually fabricated by impregnating a silane-coated glass fabric with an epoxy varnish of the amine-cured type, followed by drying (to remove the solvents) and partial curing of the film in a treater tower or a convection oven.