Influence of uniaxial and biaxial orientation on the dielectric properties of PET

Author

Bernes, Alain ; Chatain, D. ; Lacabanne, C. ; Lorentz, Gérard

Author_Institution

Lab. de Phys. des Solides, CNRS, Toulouse, France

fYear

1990

fDate

3-6 Jun 1990

Firstpage

457

Lastpage

460

Abstract

A comparative study of amorphous, uniaxially and biaxially oriented films was performed using thermally stimulated current (TSC) spectroscopy. The TSC peak around the glass temperature (T_g) was investigated. In amorphous polyethylene terephthalate (PET) a TSC peak was observed at 82°C, while under uniaxial orientation, it was shifted to 88°C, and under biaxial orientation, it reaches 100°C. The shift of this T_g peak under stretching indicates a stiffening of the amorphous chains. The analysis of the fine structure of these complex peaks shows the existence of compensation phenomena. For uniaxially and biaxially oriented PET this analysis reveals a lower and upper temperature component for the glass transition. This phenomenon indicates the existence of a segregated phase

Keywords

dielectric properties of solids; polymer films; polymer structure; thermally stimulated currents; 100 degC; 82 degC; 88 degC; amorphous chains; amorphous polyethylene terephthalate; biaxial orientation; compensation phenomena; dielectric properties; glass temperature; lower temperature component; segregated phase; thermally stimulated current; uniaxial orientation; upper temperature component; Amorphous materials; Annealing; Conductivity measurement; Crystallization; Dielectrics; Glass; Polarization; Positron emission tomography; Spectroscopy; Temperature;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation, 1990., Conference Record of the 1990 IEEE International Symposium on

Conference_Location

Toronto, Ont.

ISSN

1089-084X

Type

conf

DOI

10.1109/ELINSL.1990.109795

Filename

109795