Free rradical degradation of chitosan with potassium persulfate

doi:10.1016/S0141-3910(01)00205-1

淡江大學機構典藏 > 工學院 > 化學工程與材料工程學系暨研究所 > 期刊論文 > Item 987654321/60150

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题名:	Free rradical degradation of chitosan with potassium persulfate
作者:	董崇民;Don, Trong-ming;Hsu, Shih-chang;Chiu, Wen-yen
贡献者:	淡江大學化學工程與材料工程學系
关键词:	Chitosan;Potassium persulfate;Free radical;Degradation
日期:	2002-01
上传时间:	2011-10-13 13:05:53 (UTC+8)
摘要:	A thermal dissociation initiator, potassium persulfate (KPS), is added to the chitosan solution at 70 °C; immediately, the solution viscosity and the molecular weight of chitosan decrease in a very short time. Size exclusion chromatography, nuclear magnetic resonance and electron spin resonance were used to study the degradation mechanism. A free radical degradation mechanism of chitosan by KPS is then proposed. When KPS is thermally dissociated into anionic radicals, they are attracted to the cationic amino group in the chitosan ring. Subsequently, the anionic radical attacks the C-4 carbon and transfers the radical to the C-4 carbon by subtracting the hydrogen from it. The presence of free radical at C-4 carbon eventually results in the breakage of the glycosidic C–O–C bond in the chitosan main chain. According to this mechanism, the concentrations of KPS, total free radicals and the degraded chitosan chain at different degradation times are all calculated by solving the rate equations. Finally, the calculated average molecular weights of the degraded chitosan chains at different reaction times agree with the experimental values.
關聯:	Polymer degradation and stability 75(1), pp.73-83
DOI:	10.1016/S0141-3910(01)00205-1
显示于类别:	[化學工程與材料工程學系暨研究所] 期刊論文

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