Blends of poly(vinylidene fluoride)/poly(1,4-butylene adipate) (PVDF/PBA) with a mass ratio of 80/20 were prepared and then isothermally crystallized at high temperature. It appears that the presence of PBA can promote the α-to-γ′ phase transition of PVDF in the blends. The phase transition of PVDF in the blends can take place after shorter time and at relatively lower temperature than that in the neat PVDF. The α-to-γ′ transition prefers to start from the central part of the original α-spherulites and propagate along radial direction. Moreover, the morphology changes on lamellae scale after α-to-γ′ transition, i.e., the band structure of some α-spherulites disappears and much more lamellae become cross-linked. This is in contradictory to the proposed solid-to-solid transition mechanism in the literature.

制备质量比为80/20的聚偏二氟乙烯/聚己二酸1，4-丁二醇酯（PVDF / PBA）的共混物，然后在高温下等温结晶。看来，PBA的存在可以促进共混物中PVDF从α到γ'的相变。与纯PVDF相比，共混物中PVDF的相变可以在更短的时间和相对较低的温度下发生。从α到γ'的过渡最好从原始α球晶的中心开始，并沿径向传播。此外，α-γ'跃迁后，薄片形貌发生变化，即一些α-球晶的能带结构消失，更多的薄片交联。这与文献中提出的固体-固体过渡机制相矛盾。