The Effects of Composition, Environment and Stress on the Durability of Composite Bonds

摘要

It was shown that a single recrystallization of m-phenylenediamine (MPDA) was most effective in generating optimum G values in the MPDA cured epoxy system. It was also shown that stoichiometric quantities (14.5 phr) of MPDA provided the highest G values. Fillers were examined and a flat platelets (aluminum silicate) and rounded, granular (zirconium silicate) particles were utilized at various particle sizes and concentrations. The highest G value was obtained at 50 phr with the 1.5 micron aluminum silicate. As the size of the filler particles increased, G sub 1a approached G sub 1c indicating that large particles were more effective as crack stoppers in filled adhesive systems. (Author)