Effect of Processing Conditions on the Dielectric and Raman Response of Electroactive Polymers

• Published in: Ferroelectrics Vol. 405; no. 1; pp. 138 - 145
• Main Authors: Połomska, Maria, Hilczer, Bożena, Markiewicz, Ewa, Pogorzelec-Glaser, Katarzyna, Pietraszko, Adam
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Colchester Taylor & Francis Group 01.01.2010; Taylor & Francis; Taylor & Francis Ltd
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Crystal structure; Degree of crystallinity; Dielectric constant; Dielectric loss and relaxation; Dielectric properties of solids and liquids; Dielectric, piezoelectric, ferroelectric and antiferroelectric materials; Dielectrics; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Electroactive polymers; Exact sciences and technology; Ferroelectric materials; Ferroelectrics; Materials science; Permittivity; Permittivity (dielectric function); Physics; Polymers; Polymers; organic compounds; Polyvinylidene fluorides; Scattering; Spectrum analysis; Wide angle X ray scattering; Raman spectra; X-ray scattering; Vinylidene fluoride polymer; Crystallinity; Polymers; Property processing relationship; Permittivity; Activation energy; Conformation; Dielectric relaxation
• ISSN: 0015-0193; 1563-5112
• DOI: 10.1080/00150193.2010.483192

The relationship between the molecular and crystalline structure and the dielectric response of hot-pressed PVDF film and the films cast from N,N-dimethylacetamide solution was studied by means of wide angle X-ray scattering, Raman and dielectric spectroscopy. We have found that the degree of crystallinity of hot-pressed PVDF is by about 10% higher than that of solution-cast films, which results in a decrease in the activation energy of segmental motions and a rise in the freezing temperature. We have also observed that the solution-cast samples are more reach in sequences containing trans conformation (T) n G with n ≥ 3 which leads to an increase in their permittivity value.