Abstract: Effective ways to control the phase morphology of the epoxy(E51)/PSF/DDSblends were studied. Scanning electron microscopy(SEM) and FTIRresults revealed that epoxy resins with different molecular weight were formed by changing the degree of precure conversion, and the later cure would result in phase morphology with different average size of epoxy particles. The cure process to effectively control the phase morphology of epoxy blends could be made according to the FTIRresults. Boron trifluo ride-ethylamine complex(BTF-EA) was effective to accelerate the cure reaction of epoxy resin with DDS. The rise in cure reaction speed induced the phase structure with smaller domain size. This could be explained by the quick formation of crosslinking network that locked in the phase separation at the earlier stage in the system.

Key words: Phase morphology control, Epoxy resin blends, Cure procedure, Accelerator