Synthesis and Characterization of Modified Chitosan by Graft Polymerization

Abstract:

In this study, chitosan was modified by acrylamide and acrylonitrile when NaHSO₃-K₂S₂O₈ as initiator under N₂. Chitosan-acrylamide-acrylonitrile ternary graft copolymer was synthesized on the use of radical polymerization mechanism. The optimal experimental conditions for the preparation are obtained by orthogonal experiments: the reaction temperature 65°C, the reaction time 6.5h, the concentration of NaHSO₃ 3mmol/L, the concentration of K₂S₂O₈ 4.5mmol/L, and the ratio of m(chitosan):m(acrylamide):m(acrylonitrile) was 1:6:4. Under such conditions, the average graft ratio and the graft efficiency could achieve 852.455% and 85.260% respectively. Chitosan and chitosan-acrylamide-acrylonitrile ternary graft copolymer were then characterized by means of XRD and SEM, and the graft mechanism was explored preliminary as well. The results showed that chitosan was modified successfully by graft polymerization, and the surface property and the strength of the product were also improved obviously.

• Periodical: Advanced Materials Research (Volumes 239-242)
• Pages: 2843-2846
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.239-242.2843
• Online since: May 2011
• Authors: Juan Qin Xue, Yu Jie Wang, Ye Wei Du, Yun Feng Xue, Dan Dan Wen
• Keywords: Chitosan (CS), Graft Mechanism, Modification, Terpolymer

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