DETERMINATION OF DEGREE OF SUBSTITUTION OF CARBOXYTHEYL CELLULOSE BY FTIR EXTERNAL REFERENCE METHOD
In the present determination of its degree of substitution (DS), carboxymethyl cellulose (CMC) suffers from many disadvantages as it is used as a fast detection method in industry, such as complex operation, long-time consumption, and DS range limit. A method to determine the DS of CMC by the FTIR spectra of CMC and CMC-H, was proposed, which is low-cost, fast and easy to carry out. Firstly, some effects on absorbance change of the 1735cm-1 band, which is attributed to the stretching of vibration absorption caused by carbonyl group (-C=O) of CMC-H were discussed, and then 1735cm-1 was chosen as the marker band. Secondly, by using the absorption at 2060cm-1 absorption of KSCN as the basic peak, a curve of A1735/A2060 and DS/C(KSCN) was obtained. Finally, according to Lambert-Beer law, we drew linear regression, y=0.362+0.396x (y: A1735/A2060, x: DS/C(KSCN) ) to the curves, which concluded the DS of CMC . Furthermore, we applied the method to determine the DS of CMC samples. Compared with that from GB method, the result showed that when the DS ranges from 0.76 to 1.32, the relative deviations of the results are below 8.0％. So the method has high accuracy in the determination of the DS of industrial CMC(DS= 0.70~1.20).
Fourier Transform Infrared Spectroscopy carboxymethyl cellulose degree of substitution external reference
Zhu Hu Zhang Yanxing Xiong Jian Ye Jun
State Key Laboratory of Pulp and Paper Engineering,South China University of Technology, Guangzhou,5 State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, College of Light Chemistry and Food Science, South China University of Technology, Guangzhou, 510640
国际会议
广州
英文
306-309
2010-11-08（万方平台首次上网日期，不代表论文的发表时间）