Synthesis and Characterization of Alkylated Bacterial Cellulose in an Ionic Liquid

Jinmin Qin, Ziyu Qin, Xueqiong Yin, Qinghuan Zeng, Li Zhu


Bacterial cellulose was alkylated by alkyl halide in the ionic liquid 1-butyl-3-methylimmidazolium chloride ([Bmim]Cl) with NaH as the alkaline agent. The derivatives were characterized using Fourier transform infrared spectroscopy, nuclear magnetic resonance spectroscopy, elemental analyses, X-ray diffraction, and thermal gravimetric analyses. The resultant bacterial cellulose alkylated derivatives (BCADs) had a degree of substitution (DS) between 0.21 and 2.01. The effects of the alkylating agent, reactant amount, and temperature on the DS were investigated. BCADs with a butyl substituent had a higher DS than did those with ethyl or propyl groups. The crystallinity and thermal stability of the derivatives decreased after modification owing to the change in morphological structure.


Bacterial cellulose; Alkylation; Characterization; Ionic liquid

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