Selective oxidation of cellulose catalyzed by NHPI/Co(OAc)₂ using air as oxidant
2014
Zhou, Lipeng | Wu, Haihong | Yang, Xiaomei | Su, Yunlai | Chen, Chen | Xu, Jie
With NHPI/Co(OAc)₂ as catalyst and air as oxidant, carboxylic group functionalized cellulose was prepared by oxidation of cellulose in acetic acid. Fourier transform infrared spectroscopy was utilized to detect the generation of carboxylic group and the acid amount was determined by acid–base titration method. The present results revealed that C6 primary hydroxyl groups on glucose units were partly converted to carboxylic groups during the catalytic oxidation process. The degree of polymerization of oxidized cellulose, which was determined by viscosity measurement, decreased slightly as compared with its parent. The structure of cellulose was characterized by X-ray diffraction and scanning electron microscopy, and it was almost unchanged.
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