Synthesis and Characterization of Dialdehyde Carboxymethyl Chitosan

By : Zhu Long, Meiyan Wu, Ping Wang, Lei Dai, Dan Zhang, Huining Xiao, Cuihua Dong

Page No: 207-221

Abstract
Dialdehyde carboxymethyl chitosan was synthesized by the selective oxidation of sodium periodate to carboxymethyl chitosan in the experimentally optimized synthesis conditions. Infrared spectroscopy, X-ray diffraction and Nuclear magnetic resonance analyses showed that the aldehyde groups were formed at C2 and C3 positions of CMCS and increased in a certain range, and the carbonyl groups at C6 position were partly broken in the oxidation process. Besides, the crystallinity of DCMCS was accordingly decreased and the main chain of DCMCS get shortened by DSC and SEM measurements. Furthermore, the particle size of DCMCS with state aggregation decreased and the shape turned to be sphere like with increasing oxidation degree. DCMCS exhibited relatively high oxidation degree and high viscosity-average molecular weight with the mass ratio of NaIO4 to CMCS of 1.3:1.0, under constant stirring at 40°C , and pH of 7.5 in dark for 22 h.

Authors :
Zhu Long, Meiyan Wu, Ping Wang, Lei Dai, Dan Zhang and Huining Xiao : Laboratory of Paper-making, School of Textiles & Clothing, Jiangnan University, Wuxi 214122, China
Cuihua Dong : Key Laboratory of Pulp and Paper Science & Technology of Ministry of Education of China, Qilu University of Technology, Jinan 250353, China