Determination of Degree of Polymerization of Natural Cellulose Pulp Using Near-Infrared Diffuse Reflectance Spectroscopy
YI Ying1, SONG Chun-feng1*, YUAN Hong-fu1, XIE Jin-chun1, DU Jun-qi2, LI Xiao-yu1
1. Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, State Key Laboratory of Organic and Inorganic Composites, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China 2. College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
Abstract：A new method of near-infrared (NIR) diffuse reflectance spectroscopy is proposed to rapidly determine the degree of polymerization (DP) of natural cellulose (cotton and wood) pulp produced by a new clean pulping process. One hundred and ninety five samples were collected and their DP data were determined by standard method GB/T 9107—1999. The spectroscopy measurement method of the samples was studied and their near-infrared diffuse reflectance spectra were collected. The quantitative DP calibration models of one mixed cotton & wood and two separate cotton and wood pulps were established by partial least squares (PLS). The optimum models were developed using the spectra pretreated by derivative, autoscaling and mean-centering, and their performance is as follows: correlation coefficient of 0.980, 0.993 and 0.886, and RMSEP of 147, 143 and 53, respectively. The accuracy of NIR method was also studied. The results show that the accuracy of the two separate models of cotton and wood is better than that of the mixed model, and the precision of the two separate models is better than that of GB/T9107—1999. The identification model of cotton and wood was also established using principal component analysis (PCA). The result shows that the spectra of cotton and wood pulp have obvious difference, and the model can identify successfully the two kinds of pulp. The result indicates that the new NIR method is feasible to realize the on-line analysis of polymerization degree of natural cellulose pulp with its advantage of rapidness and easy operation.
Key words：Near-infrared diffuse reflectance spectroscopy;Natural cellulose pulp;Degree of polymerization;Clean pulping process
易 英1，宋春风1*, 袁洪福1，谢锦春1，杜俊琪2，李效玉1 . 近红外漫反射光谱法测定天然纤维素浆粕聚合度 [J]. 光谱学与光谱分析, 2014, 34(09): 2372-2376.
YI Ying1, SONG Chun-feng1*, YUAN Hong-fu1, XIE Jin-chun1, DU Jun-qi2, LI Xiao-yu1 . Determination of Degree of Polymerization of Natural Cellulose Pulp Using Near-Infrared Diffuse Reflectance Spectroscopy. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2014, 34(09): 2372-2376.
[1] HU Zong-yuan(胡宗渊). Tianjin Paper Making(天津造纸). 2007, 29(1): 2. [2] WANG Zhen-zhen, LI Qun, NIU Li-ping(汪珍珍，李 群，牛丽萍). Transactions of China Pulp and Paper(中国造纸学报). 2011, 26(4): 17. [3] LU Wan-zhen, YUAN Hong-fu, XU Guang-tong(陆婉珍, 袁洪福, 徐广通). Moden Near-Infrared Spectral Analysis Technology(现代近红外光谱分析技术). Beijing: China Petrochemical Press(北京：中国石油化工出版社), 2000. [4] Samistraro G, de Muniz GIB, Peralta-Zamora P, et al. Quimicanova, 2009, 32(6): 1422. [5] Fortier C A, Rodgers J E, Cintrón M S. Textile Research Journal, 2011, 81(3): 230. [6] Rodgers J, Fortier C, Montalvo J. Textile Research Journal，2010, 80(15): 1503. [7] Rodgers J, Montalvo J, Davidonis G. Textile Research Journal，2010, 80(9): 780. [8] Rodgers J, Montalvo J, Davidonis G. Wood Sci. Technol., 2012, 81(2): 230. [9] Uner B, Karaman I, H. Tanriverdi H. Wood Sci. Technol., 2011, 45(1): 121. [10] Ting-Feng Yeh, Yamada T, Capanema E, J. Agric. Food Chem., 2005, 53(9): 3328. [11] Santos E, Silva A, Fragoso W. Vibrational Spectroscopy, 2010, 52(2): 154.
