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Space charge limited currents in pure and iodinated cellulose acetate films
Author(s) -
Kumar Ashok,
Nath Rabinder
Publication year - 1981
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1981.070260604
Subject(s) - cellulose acetate , materials science , conductivity , space charge , electrical resistivity and conductivity , thermal conduction , doping , polymer , analytical chemistry (journal) , cellulose , ohmic contact , atmospheric temperature range , polymer chemistry , chemistry , thermodynamics , organic chemistry , composite material , optoelectronics , physics , quantum mechanics , electron , layer (electronics)
Current as a function of voltage has been studied in pure and iodine doped cellulose acetate in the temperature range 313–373 K. The space charge limited currents (SCLC) have been found to exist in pure and doped samples. The temperature dependence of conductivity is found to correspond to two activation energies. The activation energies calculated from conductivity vs. temperature plots for ohmic and SCLC regions were almost equal showing the extrinsic nature of conduction. The break point at 78°C in conductivity vs temperature plots for pure cellulose acetate may correspond to effective glass transition temperature ( T ′ g ). This has been verified from the differential thermal analysis studies. The effect of iodine doping on the electrical conduction in cellulose acetate has been investigated and the results are reported. The infrared studies reveal that iodine stays in the polymer as a neutral molecule and some of which may interact with the polymer molecules.