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Published on: August 10, 2016
Mercerization effect on structure and electrical properties of cellulose: Development of a novel fast Na-ionic
Riadh Marzouki1, Ameni Brahmia2, Samir Bondock3
1Chemistry Department, College of Science, King Khalid University, Abha 61413, Saudi Arabia; Laboratory of Materials, Crystal Chemistry and Applied Thermodynamics, LR15ES01, Faculty of Sciences of Tunis, University of Tunis El Manar, 2092, Tunisia; Chemistry Department, Faculty of Sciences of Sfax, University of Sfax, 3038, Tunisia.
Abstract:
Mercerized cellulose (alkali cellulose C6H10O5* NaOH) was obtained by treatment of cotton linters (cellulose) with aqueous sodium hydroxide. Cellulose and alkali-cellulose samples with relative density of 78% and 79% were obtained after sintering the material in air at optimal sintering temperatures of 423 K and 473 K, respectively. The electrical properties of the samples were studied by impedance spectroscopy in the frequency range from 13 MHz to 50 Hz at temperatures between 393 K and 493 K. The influence of cellulose mercerization on electrical properties of cotton linters was observed. The cellulose behaves like an electrical insulator. Contrariwise, the alkali-cellulose is a fast-ionic conductor with a conductivity value of σ473 K = 3.22 × 10-6 S cm-1 having activation energies of 0.49 eV and 0.68 eV at temperature range of 393 K-458 K and 459 K-500 K, respectively. The change of activation energy value has been discussed in relation to thermal stability.
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