Role of Annealing with Electric Field Toward Improvement of Ferroelectric and Electroactive Properties of PVDF Copolymer and Terpolymer Thin Films.

Autor: Roy D; Department of Physics, C V Raman Global University, Bhubaneswar, 752054, India., Chakraborty M; Department of Physics, C V Raman Global University, Bhubaneswar, 752054, India., Pattader PSG; Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, 781039, India., Islam AKMM; Department of Physics, Aliah University, Newtown, Kolkata, West Bengal, 700156, India., Bandyopadhyay D; Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, 781039, India.
Jazyk: angličtina
Zdroj: Macromolecular rapid communications [Macromol Rapid Commun] 2024 Nov; Vol. 45 (22), pp. e2400496. Date of Electronic Publication: 2024 Aug 05.
DOI: 10.1002/marc.202400496
Abstrakt: The present study elucidates the role of annealing with electric field on lamellar crystalline structure and molecular orientation of polymer chains in ferroelectric copolymer (P(VDF-TrFE)) and ferroelectric terpolymer (P(VDF-TrFE-CFE)) spin-coated thin films. The ferroelectric polymer thin films annealed under an electric field support the growth of nanostructure with an "edge-on" lamellar crystalline structure having in-plane molecular chain orientation. The poled P(VDF-TrFE) thin films have higher remnant polarization (P r ) ≈6.2 µC cm -2 and saturation polarization (P s ) ≈8.2 µC cm -2 at an applied electric field of 250 MV/m compared to unpoled thin films having P r ≈4.7 and P s ≈6.2 µC cm -2 . Also, poled P(VDF-TrFE) thin films show lower coercive field (E c ) ≈94 MV/m compared to an unpoled thin film having E c ≈105 MV/m. Similarly, poled PVDF-TrFE-CFE thin film shows better ferroelectric properties having P r ≈0.4 and P s ≈5.7 µC cm -2 at an applied electric field of 200 MV m -1 compared to unpoled thin films having P r ≈0.4 and P s ≈4.1 µC cm -2 . The storage energy efficiency of unpoled and poled P(VDF-TrFE-CFE) thin films is measured to be ≈75% and 80%. Annealing of ferroelectric P(VDF-TrFE) polymer thin films under an electric field demonstrates improved ferroelectric and electroactive properties.
(© 2024 Wiley‐VCH GmbH.)
Databáze: MEDLINE
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