不同结晶指数纤维素的X射线光电子能谱分析

摘要

以离子液体处理纤维素得到不同结晶指数(I_(cr))的纤维素样品.对所得样品首次采用X射线光电子能谱(XPS)的C1s能谱图与O1s能谱图,来分析不同结晶指数纤维素分子的化学状态.结合纤维素固体核磁共振(CP/MAS ~(13) CNMR)的分析结果可知,纤维素的C_2峰及O1s1峰与纤维素大分子中的氢键关系密切,其峰面积相对含量与纤维素的I_(cr)值呈现高度相关性,相关系数分别为r_1 0.999 2和r_2 0.967 9.%Microcrystalline cellulose samples with different crystallization index (I_(cr)) were obtained by treatment with ionic liquids (Ils) l-n-butyl-3-methylimidazolium chloride ([Bmim] Cl).The Cls spectra and Ols spectra from X-ray photoelectron spectroscopy (XPS)were adopted firstly to analyze the changes of crystallization index and chemical bonds in cellulose macro-molecule.Results showed good accordance with the CP/MAS ~(13)C NMR results.C2 peak of Cls XPS spectra and Olsl peak of Ols XPS spectra have close relation to hydrogen-bond in cellulose macromolecule,and their relative contents from peak area showed significant correlation with correlation coefficients of r_1 0.999 2 and r_2 0.967 9,respectively.