Synthesis and Spectroscopic Study of Polyamine-Type Cellulose-Based Chelating Fiber
HUANG Jun1, ZHAI Hua-min1*, WANG Xiao-jun2
1. Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, China 2. College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, China
Abstract：The graft copolymer (CPGMA) made from bleached chemical eucalyptus pulp (BCEP) and glycidyl methacrylate (GMA) was reacted with ethylenediamine (EDA) to synthesize the polyamine-type cellulose-based chelating fiber CPGMA-EDA. The chelating fiber was characterized by means of Fourier transform infrared spectroscopy (FTIR), 13C cross polarization magic angle spinning NMR spectra (13C CP/MAS NMR) and X-ray diffraction (XRD). The results of FTIR and 13C CP/MAS NMR show that the characteristic absorption peak (904 cm-1) of epoxy group in CPGMA disappeared, and the absorption peak around 3 200-3 500 cm-1 broadened due to the vibration of new formed N—H bond while the CPGMA reacted with EDA. Both of these indicate that amino group was grafted onto CPGMA through the ring-opening reaction. The XRD results indicate that the crystallinity of CPGMA-EDA was 48.1%, and decreased by 31.1% compared to that of BECP, indicating that the reaction not only takes place in the noncrystal regions, but also in the crystal regions of cellulose.
Key words：Bleached chemical eucalyptus pulp;Glycidyl methacrylate;Ethylenediamine;Chelating fiber
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