Dielectric properties of ethyl cellulose and ethyl-cellulose acrylic acid system

Author

Jain, Sandeep K. ; Khare, P.K.

Author_Institution

Univ. Sci. Instrum. Center, India

fYear

1999

fDate

1999

Firstpage

343

Lastpage

346

Abstract

Dielectric permittivities and losses were measured above room temperature in the frequency range 10²-10⁶ Hz for undoped and acrylic acid (AA) doped ethyl cellulose (EC) films (thickness about 20 microns) with progressively increasing AA concentration. The variation of permittivity with temperature is attributed to thermal expansion in the lower temperature region to the orientation of dipolar molecules in the neighbourhood of Tg and random thermal motion of molecules above Tg. The dielectric losses exhibit one peak. Doping with acrylic acid is found to affect the magnitude and position of the loss peak. An explanation for this has been attempted on the basis of charge transfer complex formation

Keywords

charge transfer states; dielectric losses; glass transition; molecular reorientation; organic compounds; permittivity; polymer films; thermal expansion; 100 to 1E6 Hz; 20 C; 20 mum; T_g; charge transfer complex formation; dielectric losses; dielectric permittivities; dielectric properties; dipolar molecule orientation; ethyl cellulose; ethyl-cellulose acrylic acid system; losses; permittivity; random thermal motion; room temperature; thermal expansion; Dielectric loss measurement; Dielectric losses; Dielectric measurements; Frequency measurement; Loss measurement; Permittivity measurement; Temperature distribution; Temperature measurement; Thermal expansion; Thickness measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrets, 1999. ISE 10. Proceedings. 10th International Symposium on

Conference_Location

Athens

Print_ISBN

0-7803-5025-1

Type

conf

DOI

10.1109/ISE.1999.832057

Filename

832057