The Effects of Composition, Environment and Stress on the Durability of Composite Bonds.
Final rept. 10 Mar 71-10 Mar 72,
ALPHA RESEARCH AND DEVELOPMENT INC ELVERSON PA
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It was shown that a single recrystallization of m-phenylenediamine MPDA was most effective in generating optimum crack propagation values in the MPDA cured epoxy system. It was also shown that stoichiometric quantities 14.5 phr of MPDA PROVIDED THE HIGHEST CRACK PROPAGATION 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 crack propagation value was obtained at 50 phr with the 1.5 micron aluminum silicate. As the size of the filler particles increased, crack propagation approached crack propagation indicating that large particles were more effective as crack stoppers in filled adhesive systems. Author, modified-PL
- Couplers, Fasteners and Joints