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Thermally-stimulated depolarization current studies in chemically doped poly(2,6-dimethyl-1,4-phenylene oxide)

✍ Scribed by Kalkar, AK; Kundagol, Shankar

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
168 KB
Volume
48
Category
Article
ISSN
0959-8103

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✦ Synopsis

The electret properties of solution-grown poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) ΓΌlms doped with 7,7,8,8-tetracyanoquinodimethane, tetracyanoethylene, 2,4,7-trinitro-9-Γ½uorenone and have been studied by measuring thermally-stimulated depolarization currents (TSDC) as a I 2 function of dopant concentration varying from 0.25 to 1.00 wt% for identical conditions of polarizing ΓΌeld, temperature and time. The depolarization behaviour of poled doped PPO ΓΌlm exhibits a dopant-concentration dependent single relaxation around 438 K maximum in the TSDC spectra. This is attributed to formation of charge-transfer complexes with the PPO chain by interstitially placed dopants. The existence of such a complex is conΓΌrmed by ultraviolet-visible and infrared absorption spectral measurements. The dopant-concentration dependent increase in the magnitude of the TSDC peak is attributed to the enhanced aligned dipole density.

1999 Society of Chemical Industry.

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