DocumentCode :
2559850
Title :
AC conductivity and dielectric constant studies of vinyl chloride:vinyl acetate copolymers
Author :
Mehendru, P.C. ; Singh, Ramadhar ; Panwar, V.S. ; Gupta, N.P.
Author_Institution :
Nat. Phys. Lab., New Delhi, India
fYear :
1988
fDate :
1-3 Sep 1988
Firstpage :
627
Lastpage :
631
Abstract :
AC conductivity σ(ω)m and the dielectric constant ε´ of vinyl chloride:vinyl acetate (VC;VAc) copolymers having 3, 10 and 17% VAc content (by weight) have been measured in the temperature range 77-410 K and in the frequency range 50 Hz-100 kHz. At temperatures up to 250 K, the AC conductivity can be expressed as σ(ω)=Aωs, where the slope, s , is close to unity and decreases with the increase in temperature. The dielectric constant in this temperature region shows a very weak frequency and temperature dependence. At temperatures above 300 K, the AC conductivity shows a strong temperature dependence. However, the dielectric constant in this temperature region shows a strong frequency dispersion. The mechanisms of conduction in low- and high-temperature regions are discussed in the light of an existing theoretical model
Keywords :
electrical conductivity of amorphous semiconductors and insulators; permittivity; polymers; AC conductivity; dielectric constant; frequency dispersion; temperature dependence; vinyl chloride:vinyl acetate copolymers; Conductivity measurement; Dielectric constant; Dielectric measurements; Frequency measurement; Laboratories; Polymers; Temperature dependence; Temperature distribution; Temperature measurement; Weight measurement;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electrets, 1988. (ISE 6) Proceedings., 6th International Symposium on (IEEE Cat. No.88CH2593-2)
Conference_Location :
Oxford
Type :
conf
DOI :
10.1109/ISE.1988.38643
Filename :
38643
Link To Document :
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