Crazing and dilatation-band formation in engineering thermosets Conference Paper uri icon

abstract

  • The crazing phenomenon was observed in a high-performance, thermosetting, 1,2-dihydrobenzocyclobutene and inaleimide (BCB-MI) resin system. The craze-fibril diameter, band thickness, and size of the damage zone observed in the BCB-MI matrix were all larger than those of the polystyrene craze. As a result, the BCB-MI had a much higher fracture toughness than polystyrene, bisphenol A poly carbonate, and many other rubber-toughened thermosets. Unusual crazelike dilatation bands were also detected in several engineering thermosets. These dilatation bands were, however, less effective in fracture-energy dissipation than those due to craze bands. Only when thefonnation of dilatation bands was extensive did the toughening effect become significant. The possible causc(s) and conditions resulting in crazing and thefonnation of dilatation bands in thermosets are discussed. The importance of the present findings for the toughening of high-performance thermosets is also addressed. © 1996 American Chemical Society.

author list (cited authors)

  • Sue, H. J., Yang, P. C., Puckett, P. M., Bertram, J. L., & GarciaMeitin, E. I.

publication date

  • December 1996