Details

Autor(en) / Beteiligte

• Debili, S.
• Gasmi, A.
• Bououdina, M.

Titel

Synergistic effects of stretching/polarization temperature and electric field on phase transformation and piezoelectric properties of polyvinylidene fluoride nanofilms

Ist Teil von

• Applied physics. A, Materials science & processing, 2020-04, Vol.126 (4), Article 309

Ort / Verlag

Berlin/Heidelberg: Springer Berlin Heidelberg

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• This study aims to investigate the dependence of crystalline structure and piezoelectric properties of polyvinylidene fluoride stretched films (up to four times their initial length) as a function of temperature, polarization under constant field as well as varying electric field at constant polarization temperature. X-ray diffraction analysis indicates that α → β phase transformation occurs below 80 °C; meanwhile, the crystallinity is improved with stretching temperature reaching 44% compared to 32% for un-stretched. FTIR analysis confirms the results obtained by XRD, as new functional groups, shift of peaks position as well as reduction in their relative intensity are observed. It is found that the piezoelectric coefficient ( d 33 ) decreases with increasing temperature, while it increases with the electric field. The obtained results are discussed on the basis of the dependence of ( d 33 ) as a function of phase (α + β + amorphous) composition and the degree of crystallinity associated with various vibrational modes and the arrangement of hydrogen and fluorine atoms (corresponding charge H + and F − ) from either sides of PVDF skeleton chains arising upon the influence of thermomechanical treatment, polarization and electric field.