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- Title
Effects of initial crystallization process on piezoelectricity of PVDF-HFP films.
- Authors
Hu, Bin; Hu, Ning; Wu, Liangke; Liu, Feng; Liu, Yaolu; Ning, Huiming; Atobe, Satoshi; Fukunaga, Hisao
- Abstract
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).
- Subjects
CRYSTALLIZATION; PIEZOELECTRICITY; POLYVINYLIDENE fluoride; CRYSTALLINITY; MICROFIBRILS
- Publication
Journal of Polymer Engineering, 2015, Vol 35, Issue 5, p451
- ISSN
0334-6447
- Publication type
Article
- DOI
10.1515/polyeng-2014-0239