PVDF/PTW blends were directly prepared by melt blending and the phase behavior of PVDF/PTW blends was expored by using the dynamic rheology and scanning electron microscopy (SEM).As was shown in the plot of dynamic modulus versus frequency for PVDF/PTW blends at 200 ℃

with increasing the content of PTW

the rheological behavior of the PVDF/PTW blends at low frequency deviated from the classical rheological theory

which was corresponding to cole-cole curves of PVDF/PTW blends at 200 ℃.The viscoelastic properties of PVDF/PTW blends were systematically investigated by using master curves of blends obtained from time-temperature superposition (tTS) principle

Han plots and vGP plots.The results showed that tTS principle worked well for PVDF/PTW blends in homogeneous region.On the other hand

in the phase-separated region

the viscoelastic properties of PVDF/PTW blends were different from characteristic thermorheological responses

especially for the characteristic deviations of the storage modulus at low frequencies

and the Han plots and vGP plots also showed the different shapes corresponding to the homogeneous system.These results showed that PVDF/PTW (PVDF/PTW=90/10) (W/W) blend had better miscibility than the others and it was also confirmed by SEM.