The effect of PBS on the morphological features of PVDF has been investigated by optical and atomic force microscopies under various conditions. It was found that neat PVDF forms large

γ

form spherulites with extraordinarily weak birefringence at 170℃. Adding 30% PBS makes PVDF exhibit intrigued flower-like spherulitic morphology. The growth mechanism was explained by the decrease of the supercooling and the materials dissipation. Increasing the PBS content to 70% favors the formation of ring banded spherulites. Temperature dependent experiments verify the

α

→

γ

′ phase transition occurs from the junction sites of the

α

and

γ

crystals

while starts from the centers of

α

spherulites in the blends. Ring banded structures could be observed in neat PVDF

70/30 blend and 30/70 blend when crystallized at 155℃

without

γ

crystals. The band period of PVDF

α

spherulites increases with crystallization temperature as well as the amount of PBS content. At 140℃

spherulites in neat PVDF lose their ring banded feature

while coarse spherulites consisting of evident lamellar bundles could be found in 30/70 blend.