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Received June 30, 2013
Accepted October 20, 2013
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Effect of plasma power on degradation of chitosan
Department of Chemical Engineering, Kangwon National University, 192-1, Hyoja-dong, Chuncheon, Gangwon-do 200-701, Korea 1Gangwon Institute for Regional Program Evaluation, 192-1, Hyoja-dong, Chuncheon, Gangwon-do 200-701, Korea
krlee@kangwon.ac.kr
Korean Journal of Chemical Engineering, January 2014, 31(1), 162-165(4), 10.1007/s11814-013-0221-6
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Abstract
The depolymerization of chitosan by plasma in the presence of oxygen (O2) and nitrogen (N2) was investigated with various PECVD power. The degree of the depolymerization was determined by measuring the viscosity. With 100W of PECVD, the average molecular weight (Mw) decreased from 93,000 of raw chitosan to about 41,000 with plasma-treating time of 5 min in N2, and 45,000 in O2. The depolymerization of chitosan increased with increasing PECVD power from 100W to 400W, and with increasing PECVD treating time from 1min to 5 min. FT-IR showed the absorption band peaks of the amine (-NH) band at 1,541-1,549 cm^(-1) and the carbonyl (C=O) band at 1,654 cm^(-1) and 3,422-3,488 cm^(-1) substantially decreased. The decrease in band peaks means that the chain of chitosan macromolecules was broken into smaller unit which results in decreasing viscosity. Therefore, plasma treatment in the presence of O2 or N2 is a potentially applicable technique for the production of low molecular chitosan.
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References
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Flory PJ, Principles of Polymer Chemistry, Cornell U. Press Ithaca and London (1995)
Amaral IF, Granja PL, Barbosa MA, J. Biomater. Sci. Polymer Ed., 16, 1575 (2005)
