4 years ago

Preparation of gamma-PVDF with controlled orientation and insight into phase transformation

Preparation of gamma-PVDF with controlled orientation and insight into phase transformation
Highly oriented β-PVDF thin layer was produced by shearing the supercooled PVDF melt at 160 °C with a knife blade. The oriented β-PVDF crystals were found to be effective inducing the transcrystallization of the non-sheared PVDF melt at 160 °C and leading to the formation of a transcrystalline α-PVDF layer. Annealing of the transcrystalline α-PVDF, the well-known α-to-γ′ phase transition takes place uniformly at the βα interface, leading the induced γ′-PVDF crystals propagate homogenously from interface outward in transcrystalline α-PVDF layer. The α-to-γ′ phase transition proceeds much slower than the growth of the transcrystalline α-PVDF layer. Nevertheless, a uniform transcrystalline γ′-PVDF layer of hundreds of micrometers can be created with sufficient time, which provides a novel method for producing γ′-PVDF with controlled morphology and improved yield. The β-PVDF induced α-to-γ′ phase transition is also suggested to be triggered by the TTT sequences.

Publisher URL: www.sciencedirect.com/science

DOI: S0032386117306638

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