Citation: Yi-Ran Zheng, Jie Zhang, Xiao-Li Sun, Hui-Hui Li, Zhong-Jie Ren, Shou-Ke Yan. Enhanced αγ' Transition of Poly(vinylidene fluoride) by Step Crystallization and Subsequent Annealing[J]. Chinese Journal of Polymer Science, ;2018, 36(5): 598-603. doi: 10.1007/s10118-018-2040-z shu

Enhanced αγ' Transition of Poly(vinylidene fluoride) by Step Crystallization and Subsequent Annealing

State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China

Corresponding author: Shou-Ke Yan, skyan@mail.buct.edu.cn
Received Date: 9 August 2017
Accepted Date: 8 September 2017
Available Online: 18 January 2018

Poly(vinylidene fluoride) (PVDF) exhibits pronounced polymorphs. Its γ phase is attractive due to the electroactive properties. The γ-PVDF is however difficult to obtain under normal crystallization condition. In a previous work, we reported a simple melt-recrystallization approach for producing γ-phase rich PVDF thin films through selective melting and subsequent recrystallization. We reported here another approach for promoting the αγ' phase transition to prepare γ-phase rich PVDF thin films. To this end, a stepwise crystallization and subsequent annealing process was used. The idea is based on a quick generation of a large amount of α-PVDF crystals with some of their γ-PVDF counterparts at suitable crystallization temperature and then annealing at a temperature above the crystallization temperature for enhancing the molecular chain mobility to overcome the energy barrier of phase transition. It was found that crystallizing the PVDF melt first at 152℃ for 4 h, then quenching to room temperature and finally annealing the sample at 160℃ for 100 h was the most efficient to produce γ-PVDF rich films. This is related to the melting and recrystallization of the α-PVDF crystals produced during quenching in the annealing process at 160℃, which favors the formation of γ-PVDF crystals for triggering the αγ' phase transition.
- Poly(vinylidene fluoride),
- Step crystallization,
- Annealing,
- Phase transition
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