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Title of Journal: Fibers Polym

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Abbravation: Fibers and Polymers

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The Korean Fiber Society

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DOI

10.1016/j.apm.2016.06.026

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1875-0052

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Decay of electrical conductivity in Emphasis Type

Authors: Akif Kaynak
Publish Date: 2009/11/08
Volume: 10, Issue: 5, Pages: 590-593
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Abstract

Long term performance of conductivity of ptoluene sulfonic acid pTSA doped electrochemically synthesized polypyrrole PPy films was estimated from accelerated aging studies between 80 °C and 120 °C Conductivity decay experiments indicated that overall aging behavior of PPy films deviated from first order kinetics at prolonged aging times at elevated temperatures However an approximate value for the activation energy of the conductivity decay of PPy was calculated as E=474 kJ/mol enabling an estimate of a rate constant of k=835×10−6/min at 20 °C The rate of decrease of conductivity was not only temperature dependent but also influenced by the dopant concentration A concentration of 0005 M pTSA in the electrolyte resulted in a conductive film and when this film was exposed to 120 °C for a period of 40 h the conductivity decayed to about 1/20 of its original value The concentration of pTSA was increased to 005 mol/l and when the resulting film was aged in the same way it showed a decrease in the conductivity to about 1/3 of its original value Both microwave transmission and dc conductivity data revealed that highly doped films were considerably more electrically stable than lightly doped films The dopant had a preserving effect on the electrical properties of PPy

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