Yusuf, S.N.F. and Arof, Abdul Kariem and Majid, S.R. and Yahya, R. (2009) Phosphoric acid doped N-phthaloylchitosan as polymer electrolyte membrane. In: National Workshop on Functional Materials 2009, 16 June 2009, Centre For Ionics, University of Malaya.
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Abstract
To diversify the applications of chitosan, structural modifications are required. In this work the modified chitosan were synthesized using phthalic anhydride. N-phthaloylation is said to be one of the potential methods to improve the solubility of chitosan in organic solvents. The precipitate obtained after drying in vacuum is yellowish in color and powdery in nature. FTIR proved the occurrence of phthaloylation. 'H NMR spectrum exhibits two sets of broad peaks The FTIR and 'H NMR spectra verified the occurrence of phthaloylation at the amino group of the chitosan. Phthaloyl chitosan shows excellent solubility in organic solvents such as DMF, DMSO, DMAc, and pyridine. The chemically modified chitosan was able to form transparent films by the solvent casting method. Phosphoric acid was introduced as the doping acid at various concentrations from 5 to 25 wt. %. The doped films are also evaluated for its electrical properties using impedance spectroscopy. The maximum conductivity of PhCh film was found to be 2.03 x 10-5 S cm-' exhibited by the film containing 25 wt. % phosphoric acid.
| Item Type: | Conference or Workshop Item (Paper) |
|---|---|
| Funders: | UNSPECIFIED |
| Uncontrolled Keywords: | Polymer membrane, phthaloylation, chitosan |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) |
| Divisions: | Faculty of Science |
| Depositing User: | Mr. Mohd Samsul Ismail |
| Date Deposited: | 18 Dec 2014 00:46 |
| Last Modified: | 04 Oct 2018 06:07 |
| URI: | http://eprints.um.edu.my/id/eprint/11177 |
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