Figure 5.
Storage modulus (a) and tan δ (b) versus temperature for the neat DGEBA and the D-N-modified epoxy resins with different DHC-N loadings. (c) Onset temperature, Td (i.e., a temperature at which storage modulus starts to decline significantly), of the D-N modified epoxy resin as a function of the DHC-N loading. (d) Tg composition behavior of the blends: (○) Tg measured from DMA and (●) Tg calculated based on Fox equation, and the k values shown in the inset are calculated based on the Gorden-Taylor equation.