TEMPO-Mediated Oxidation of Bacterial Cellulose in Buffer Solution

Abstract:

Oxidized bacterial cellulose (BC) was prepared in Na₂CO₃-NaHCO₃ buffer solution using NaClO as a primary oxidant with catalytic amounts of 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO) and NaBr at pH 10.5. Ethylenediamine was used as activators to pretreat BC in order to increase the accessibility of primary hydroxyl groups. The structures and properties of oxidized BC were characterized by attenuated total reflection infrared spectroscopy (ATR-IR), elemental analysis (EA), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results indicate that the reformative oxidation successfully introduces carboxyl groups into BC, and the carboxyl content was found to be 1.34mmol per gram cellulose, higher than that of BC without pretreatment (0.81 mmol/g carboxyl introduced) under the same condition. In addition, the oxidized BC maintained the original structure which could expand the application of BC.

• Periodical: Materials Science Forum (Volume 789)
• Pages: 90-94
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.789.90
• Online since: April 2014
• Authors: Chuan Lu*, Shi Yan Chen, Yi Zheng, Wei Li Zheng, Cao Xiang, Hua Ping Wang
• Keywords: Bacterial Cellulose, Buffer Solution, Oxidation, TEMPO

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