Effects of initial crystallization process on piezoelectricity of PVDF-HFP films

Bin Hu, Ning Hu, Liangke Wu, Feng Liu, Yaolu Liu, Huiming Ning, Satoshi Atobe, Hisao Fukunaga

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


The effects of some important factors in the initial crystallization process of the solution casting method on the piezoelectricity of poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) films were extensively explored. The experimental results revealed that there is an optimal initial crystallization temperature at around 90°C. The slow cooling speed can moderately enhance the degree of crystallinity. The most important finding was that a bilayer crystalline structure caused by an asymmetrical heating pattern can enhance the formation of packed micro-fibrillar morphologies after drawing. These three points can increase the piezoelectricity of the PVDF-HFP films, indicating the increase of the extended-chain crystals (β-phase).

Original languageEnglish
Pages (from-to)451-461
Number of pages11
JournalJournal of Polymer Engineering
Issue number5
Publication statusPublished - 2015 Jun 1


  • crystalline structure
  • initial crystallization process
  • piezoelectricity

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Polymers and Plastics
  • Materials Chemistry


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