Radiation effects on microcrystalline cellulose in 1-butyl-3-methylimidazolium chloride ionic liquid |
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| Authors: | Yan Hao Jing Peng Yinyong Ao Jiuqiang Li Maolin Zhai |
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| Affiliation: | Beijing National Laboratory for Molecular Sciences (BNLMS), Department of Applied Chemistry, Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, 100871 Beijing, PR China; School of Chemistry and Chemistry Engineering, Inner Mongolia University of Science & Technology, 014010 Baotou, Inner Mongolia, PR China. |
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| Abstract: | The radiation processing of cellulose in ionic liquids (ILs) demands a comprehensive knowledge of radiation effects on cellulose in ILs. Herein, gamma radiation-induced degradation kinetics of microcrystalline cellulose (MCC) in 1-butyl-3-methylimidazolium chloride ([Bmim]Cl) was studied by viscometry. The intrinsic viscosity of MCC in [Bmim]Cl decreased slightly with increasing dose; while chemical structure and crystalline state of cellulose has no obvious change up to 300kGy. The radiation degradation rate constant (k) of MCC in [Bmim]Cl was 2.60×10(-7)/kGy, lower than that of solid cellulose, but higher than that in N-methylmorpholine-N-oxide (NMMO) solvent. Furthermore, k value decreased to 1.12×10(-7)/kGy in dimethyl sulfoxide (DMSO)/[Bmim]Cl system due to the free radicals scavenging of DMSO. The radicals generated during irradiation play main role in the radiation degradation of MCC in [Bmim]Cl. This work provides a new way to control the average molecular weight of cellulose by radiation-induced degradation of cellulose in ILs. |
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