Structural and electrical properties of hexanoyl chitosan-based polymer electrolyte / Fadiatul Hasinah Muhammad

The insolubility of chitosan in a wide range of organic solvents has limited its practical application especially in electrochemical systems. In order to improve its solubility, acyl modification of chitosan was carried out in the present study. Films of hexanoyl chitosan-based polymer electrolyte...

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Main Author:	Muhammad, Fadiatul Hasinah
Format:	Thesis
Language:	English
Published:	2010
Subjects:	Animal biochemistry
Online Access:	https://ir.uitm.edu.my/id/eprint/15522/1/TM_FADIATUL%20HASINAH%20MOHAMMAD%20AS%2010_5.PDF
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spelling	my-uitm-ir.155222016-11-21T08:22:03Z Structural and electrical properties of hexanoyl chitosan-based polymer electrolyte / Fadiatul Hasinah Muhammad 2010 Muhammad, Fadiatul Hasinah Animal biochemistry The insolubility of chitosan in a wide range of organic solvents has limited its practical application especially in electrochemical systems. In order to improve its solubility, acyl modification of chitosan was carried out in the present study. Films of hexanoyl chitosan-based polymer electrolyte were prepared by solution casting technique. Lithium perchlorate (LiC104) was used as the doping salt while titanium oxide (Ti02) was used as the inorganic filler. In the present study, the plasticized hexanoyl chitosan-based polymer electrolyte was prepared by employing dimethyl carbonate (DMC) as the plasticizing solvent. The X-ray Diffraction (XRD), Fourier Transform Infrared (FTIR) and impedance spectroscopy (IS) were used to characterize the prepared samples. With addition of 30 wt.% LiC104, the conductivity of hexanoyl chitosan-based polymer electrolyte was enhanced from 2.37 x 10' 13 to 1.85 x 10"5 S cm'1. For composite polymer electrolyte system, the highest ionic conductivity was achieved at 3.06 x 10~4 S cm"1 with incorporation of 6 wt.% TiC>2. The highest ionic conductivity value of 4.09 x 10"4 S cm' 1 was obtained with addition of 15 wt.% DMC to hexanoyl chitosan-LiCKVTiC^ electrolyte system. The conductivity increased is due to the increase in the number of free ions and their mobility while the decrease in conductivity is attributed to the ion association which decreases the number of charge carriers available for ionic conduction. Conductivity of hexanoyl chitosan-based polymer electrolytes was also studied as a function of temperature ranging from 283 to 333 K. the conductivity is found to increase with increasing temperature. The regression values, R2 are in the range of 0.97 to 0.99 indicating that all points stretch out in an almost straight line and therefore implying that the conductivity is thermally assisted and can be described by Arrhenius law. Ac conductivity and scaling behaviour of hexanoyl chitosan-based polymer electrolytes were studied at different temperatures. The Jonsher’s universal power law was used to discuss the ac conductivity behaviour of the samples. The temperature dependence of the power law exponent s for the salted hexanoyl chitosan follows the Overlapping Large Polaron Tunneling (OLPT) model while the conduction mechanism for composited hexanoyl chitosan-based polymer electrolyte systems are interpreted based on the Correlated Barrier Hopping (CBH) model. 2010 Thesis https://ir.uitm.edu.my/id/eprint/15522/ https://ir.uitm.edu.my/id/eprint/15522/1/TM_FADIATUL%20HASINAH%20MOHAMMAD%20AS%2010_5.PDF text en public mphil masters Universiti Teknologi MARA Faculty of Applied Sciences
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
topic	Animal biochemistry
spellingShingle	Animal biochemistry Muhammad, Fadiatul Hasinah Structural and electrical properties of hexanoyl chitosan-based polymer electrolyte / Fadiatul Hasinah Muhammad
description	The insolubility of chitosan in a wide range of organic solvents has limited its practical application especially in electrochemical systems. In order to improve its solubility, acyl modification of chitosan was carried out in the present study. Films of hexanoyl chitosan-based polymer electrolyte were prepared by solution casting technique. Lithium perchlorate (LiC104) was used as the doping salt while titanium oxide (Ti02) was used as the inorganic filler. In the present study, the plasticized hexanoyl chitosan-based polymer electrolyte was prepared by employing dimethyl carbonate (DMC) as the plasticizing solvent. The X-ray Diffraction (XRD), Fourier Transform Infrared (FTIR) and impedance spectroscopy (IS) were used to characterize the prepared samples. With addition of 30 wt.% LiC104, the conductivity of hexanoyl chitosan-based polymer electrolyte was enhanced from 2.37 x 10' 13 to 1.85 x 10"5 S cm'1. For composite polymer electrolyte system, the highest ionic conductivity was achieved at 3.06 x 10~4 S cm"1 with incorporation of 6 wt.% TiC>2. The highest ionic conductivity value of 4.09 x 10"4 S cm' 1 was obtained with addition of 15 wt.% DMC to hexanoyl chitosan-LiCKVTiC^ electrolyte system. The conductivity increased is due to the increase in the number of free ions and their mobility while the decrease in conductivity is attributed to the ion association which decreases the number of charge carriers available for ionic conduction. Conductivity of hexanoyl chitosan-based polymer electrolytes was also studied as a function of temperature ranging from 283 to 333 K. the conductivity is found to increase with increasing temperature. The regression values, R2 are in the range of 0.97 to 0.99 indicating that all points stretch out in an almost straight line and therefore implying that the conductivity is thermally assisted and can be described by Arrhenius law. Ac conductivity and scaling behaviour of hexanoyl chitosan-based polymer electrolytes were studied at different temperatures. The Jonsher’s universal power law was used to discuss the ac conductivity behaviour of the samples. The temperature dependence of the power law exponent s for the salted hexanoyl chitosan follows the Overlapping Large Polaron Tunneling (OLPT) model while the conduction mechanism for composited hexanoyl chitosan-based polymer electrolyte systems are interpreted based on the Correlated Barrier Hopping (CBH) model.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Muhammad, Fadiatul Hasinah
author_facet	Muhammad, Fadiatul Hasinah
author_sort	Muhammad, Fadiatul Hasinah
title	Structural and electrical properties of hexanoyl chitosan-based polymer electrolyte / Fadiatul Hasinah Muhammad
title_short	Structural and electrical properties of hexanoyl chitosan-based polymer electrolyte / Fadiatul Hasinah Muhammad
title_full	Structural and electrical properties of hexanoyl chitosan-based polymer electrolyte / Fadiatul Hasinah Muhammad
title_fullStr	Structural and electrical properties of hexanoyl chitosan-based polymer electrolyte / Fadiatul Hasinah Muhammad
title_full_unstemmed	Structural and electrical properties of hexanoyl chitosan-based polymer electrolyte / Fadiatul Hasinah Muhammad
title_sort	structural and electrical properties of hexanoyl chitosan-based polymer electrolyte / fadiatul hasinah muhammad
granting_institution	Universiti Teknologi MARA
granting_department	Faculty of Applied Sciences
publishDate	2010
url	https://ir.uitm.edu.my/id/eprint/15522/1/TM_FADIATUL%20HASINAH%20MOHAMMAD%20AS%2010_5.PDF
_version_	1783733414380175360

Structural and electrical properties of hexanoyl chitosan-based polymer electrolyte / Fadiatul Hasinah Muhammad

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