Title :
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
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; Tg; 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;
Conference_Titel :
Electrets, 1999. ISE 10. Proceedings. 10th International Symposium on
Conference_Location :
Athens
Print_ISBN :
0-7803-5025-1
DOI :
10.1109/ISE.1999.832057
