| Free rradical degradation of chitosan with potassium persulfate | |
|---|---|
| 學年 | 90 |
| 學期 | 1 |
| 出版（發表）日期 | 2002-01-01 |
| 作品名稱 | Free rradical degradation of chitosan with potassium persulfate |
| 作品名稱（其他語言） | |
| 著者 | 董崇民; Don, Trong-ming; Hsu, Shih-chang; Chiu, Wen-yen |
| 單位 | 淡江大學化學工程與材料工程學系 |
| 出版者 | |
| 著錄名稱、卷期、頁數 | Polymer degradation and stability 75(1), pp.73-83 |
| 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. |
| 關鍵字 | Chitosan;Potassium persulfate;Free radical;Degradation |
| 語言 | en |
| ISSN | 0141-3910 1873-2321 |
| 期刊性質 | 國外 |
| 收錄於 | |
| 產學合作 | |
| 通訊作者 | |
| 審稿制度 | 否 |
| 國別 | GBR |
| 公開徵稿 | |
| 出版型式 | ,電子版,紙本 |
| 相關連結 |
機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/60150 ) |
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