TEMPO Electromediated Oxidation of Some Polysaccharides Including Regenerated Cellulose Fiber
TEMPO Electromediated Oxidation of Some Polysaccharides Including Regenerated Cellulose Fiber
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DOI：
10.1021/bm1002575
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发表时间：
2010-06-01
影响因子：
6.2
通讯作者：
Isogai, Akira
中科院分区：
文献类型：
--
作者：
Isogai, Takuya;Saito, Tsuguyuki;Isogai, Akira
在pH 6.8的缓冲液中，在没有NaClO或NaClO 2的情况下，用4-乙酰胺基-TEMPO催化剂对可得然胶、淀粉糊精和再生纤维素纤维进行电介导氧化。通过这种方法，可得然胶和淀粉糊精的90%以上的C6伯羟基被转化为羧酸钠基团。氧化产物的分子量值远高于由克里思/NaBr/NaClO体系在pH 10时制备的那些。再生纤维素纤维经克里思电介导氧化处理45 h后，氧化纤维素纤维中分别形成1.1和0.6 mmol/g的羧酸根和醛基。原始的纤维状和精细的表面形态得以保持，并且几乎没有观察到氧化引起的重量损失。因此，克里思电介导的氧化是再生纤维素纤维、膜和相关成形材料的特征和环境友好的化学改性，并且可将可离子交换的羧酸根和反应性醛基有效地引入再生纤维素中。
Curdlan, amylodextrin, and regenerated cellulose fiber were subjected to electromediated oxidation with a 4-acetamido-TEMPO catalyst in a buffer at pH 6.8 without NaClO or NaClO2. More than 90% of the C6 primary hydroxyls of Curdlan and amylodextrin were converted to sodium carboxylate groups by this method. Molecular mass values of the oxidized products were much higher than those prepared by the TEMPO/NaBr/NaClO system at pH 10. When the regenerate cellulose fiber was treated by the TEMPO electromediated oxidation for 45 h, carboxylate and aldehyde groups of 1.1 and 0.6 mmol/g, respectively, were formed in the oxidized cellulose fiber. The original fibrous and fine surface morphologies were maintained, and nearly no weight losses by the oxidation were observed. Thus, the TEMPO electromediated oxidation is a characteristic and environmentally friendly chemical modification for regenerated cellulose fibers, films, and related forming materials, and ion-exchangeable carboxylate and reactive aldehyde groups can be efficiently introduced into regenerated celluloses.