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https://ptsldigital.ukm.my/jspui/handle/123456789/499914| Title: | Investigation on the effects of imidazolium ionic liquids on the derivatives of chitosan and kappa carrageenan based biopolymer electrolytes for application in electrochemical devices |
| Authors: | Intan Juliana Shamsudin (P68811) |
| Supervisor: | Azizan Ahmad, Prof. Dr. |
| Keywords: | Chitosan Carrageenan Biopolymer Ionic liquids Electrochemical Dissertations, Academic -- Malaysia |
| Issue Date: | 8-Jan-2016 |
| Description: | Carboxymethyl chitosan and carboxymethyl ƙ-carrageenan which are the derivatives of chitosan and ƙ-carrageenan respectively, were prepared by chemical modification process. Biopolymer electrolytes systems based on chitosan, ƙ-carrageenan and the derivatives were successfully prepared by solution casting technique. Two types of imidazolium ionic liquids which are 1-butyl-3-methylimidazolium acetate and 1-butyl-3-methylimidazolium chloride were used as charge carrier and plasticizer in the systems. Several characterization were performed in order to investigate the properties of the derivatives and the electrolytes such as Fourier transform infrared spectroscopy, nuclear magnetic resonance analysis, degree of substitution, X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, electrochemical impedance spectroscopy, linear sweep voltammetry and transference number measurement. The modification of chitosan and ƙ-carrageenan were proven to increase the ionic conductivity (σ) due to the increase number of active sites (COO-) in the structure of the derivatives. Reduced degree of crystallinity and preserved thermal stability of the derivatives were also observed. The efficient function of the ionic liquids as charge carriers are noticed as the σ increased with higher weight percentages (wt.%) of ionic liquids and achieved σ up to ≈ x 10-3 Scm-1. FTIR results showed strong chemical interactions by the shifts and changes of several peaks thus suggesting the coordination and hydrogen bonding interactions of the ionic liquids with the biopolymers. Ionic conduction mechanisms were proposed based on the FTIR results. Structural studies revealed the reduced degree of crystallinity as higher wt.% of 1-butyl-3-methylimidazolium acetate and 1-butyl-3-methylimidazolium chloride were included into the biopolymer electrolytes systems. Morphological studies showed smoother surface morphology of the biopolymer electrolytes as higher wt.% of ionic liquids were added that reflecting good miscibility and compatibility of the biopolymers and the ionic liquids. The biopolymer electrolytes showed improvements in the electrochemical stability with the inclusion of ionic liquids compared to the pure biopolymers. High transference number measurements confirmed that ions are the major element that contributed to the σ. Hence, based on the results, it is concluded that the biopolymer electrolytes with imidazolium ionic liquids are applicable for potential application in electrochemical devices.,Certification of Master's/Doctoral Thesis" is not available |
| Pages: | 147 |
| Publisher: | UKM, Bangi |
| Appears in Collections: | Faculty of Science and Technology / Fakulti Sains dan Teknologi |
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