Attempts to improve the toughness of triallyl isocyanurate (TAIC) resins were unsuccessful using the procedures developed for diallyl phthalate (DAP) resins as typical allyl resins by considering microinhomogenization of the DAP resin during polymerization beyond the gel-point conversion. This demonstrates the difference in network structure of TAIC and DAP resins. The structure of branched TAIC prepolymer was characterized as dendritic by SEC-MALLS-viscometry. Thus, an alternative explanation for the brittleness of TAIC resins is provided: the insufficient growth of the network structure of TAIC resin because of steric hindrance on the crosslinking reaction between sterically crowded growing polymer radical and pendant allyl groups belonging to the rigid primary polymer chain
