Figure 3 showed the DSC curves of BMI blends with 0- to 20-phr PPEK at a heating rate of 10 K/min.
f] (a) [DELTA]E ([degrees]C) ([degrees]C) ([degrees]C) (kJ/mol) Neat resin 210 256 292 87 PPEK 5-phr 207 255 293 86 PPEK 10-phr 208 252 286 78 PPEK 15-phr 208 256 294 80 PPEK 20-phr 220 257 281 95 (a) The results were determined by DSC measurements at heating rate of 10 K/min.
When PPEK was introduced, the activation energy of the cure reaction had no obvious change.
and 20-phr PPEK blends, which would aid in designing materials by the control of structure development in multicomponent thermosetting resins.
The phase evolution process in 10-phr PPEK blend was shown in Fig.
Figure 6 showed the phase separation process in 15-phr PPEK blend.
The morphology of the cured blends exhibited a continuously transition from a spherical particle structure to a phase-inverted structure with the increase of the PPEK content.
The fracture surfaces of 5- and 10-phr PPEK blends (Fig.