Enhanced <italic style="font-style: italic">αγ</italic>' Transition of Poly(vinylidene fluoride) by Step Crystallization and Subsequent Annealing

Yi-Ran Zheng; Jie Zhang; Xiao-Li Sun; Hui-Hui Li; Zhong-Jie Ren; Shou-Ke Yan

doi:10.1007/s10118-018-2040-z

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

Articles | Updated：2021-02-18

- Enhanced αγ' Transition of Poly(vinylidene fluoride) by Step Crystallization and Subsequent Annealing
- Chinese Journal of Polymer Science Vol. 36, Issue 5, Pages: 598-603(2018)
- Affiliations：
  
  State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
- Author bio：
  
  Shou-Ke Yan, E-mail skyan@mail.buct.edu.cn
- Funds：
- DOI：10.1007/s10118-018-2040-z
  CLC：
- Received：09 August 2017，
  
  Accepted：08 September 2017，
  
  Online First：18 January 2018，
  
  Published：2018-05
- Accepted：
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Yi-Ran Zheng, Jie Zhang, Xiao-Li Sun, et al. 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.
DOI：

Yi-Ran Zheng, Jie Zhang, Xiao-Li Sun, et al. 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. DOI：

摘要

Abstract

Poly(vinylidene fluoride) (PVDF) exhibits pronounced polymorphs. Its

phase is attractive due to the electroactive properties. The

-PVDF is however difficult to obtain under normal crystallization condition. In a previous work

we reported a simple melt-recrystallization approach for producing

-phase rich PVDF thin films through selective melting and subsequent recrystallization. We reported here another approach for promoting the

αγ

' phase transition to prepare

-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

-PVDF crystals with some of their

-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

-PVDF rich films. This is related to the melting and recrystallization of the

-PVDF crystals produced during quenching in the annealing process at 160℃

which favors the formation of

-PVDF crystals for triggering the

αγ

' phase transition.

关键词

Keywords

references

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

DOI：10.1007/s10118-018-2040-z

摘要

Abstract

关键词

Keywords

references