Melt-solidified and cast films of P(VDF-TrFE) copolymers: a comparison study

Author

Alves, N. ; Silva, N.G. ; Conceicao Silva, A.J.G. ; Kondo, A.A. ; Plepis, A.M.G. ; Mascarenhas, Y.P. ; Giacometti, J.A. ; Oliveira, O.N., Jr.

Author_Institution

Fac. de Ciencia e Tecnologia, Sao Paulo Univ., Brazil

fYear

1994

fDate

7-9 Sept. 1994

Firstpage

656

Lastpage

661

Abstract

Structural and electrical properties of poly(vinylidene fluoride-trifluorethylene)P(VDF-TrFE) films, obtained either from casting a solution or by compression moulding from a molten phase, have been reported in a number of studies. Even though results may differ to a considerable extent when samples are prepared with different methods, few studies address these differences whose origins may lie in distinct thermal treatments. In the present study we undertake a careful comparison of experimental DSC and FTIR results on 60/40, 70/30 and 80/20 P(VDF-TrFE) copolymer samples, fabricated using these two methods. The DSC results for the 60/40 and 70/30 copolymer show two phase transitions, with the samples behaving as a paraelectric material only after the 2nd transition. It is shown that the main differences between melt-solidified and cast films arise from the thermal treatment suffered by the former samples.

Keywords

Fourier transform spectra; electrets; ferroelectric transitions; infrared spectra; polymer blends; polymer films; thermal analysis; DSC; FTIR spectra; P(VDF-TrFE) copolymers; cast films; compression moulding; electrets; melt-solidified films; paraelectric material; phase transitions; thermal treatments; Annealing; Calorimetry; Casting; Compression molding; Dielectric materials; History; Phase measurement; Solvents; Temperature; Thermal factors;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrets, 1994. (ISE 8), 8th International Symposium on

Conference_Location

Paris, France

Print_ISBN

0-7803-1940-0

Type

conf

DOI

10.1109/ISE.1994.514847

Filename

514847