Research on Synthesis of Nano Chitosan modified Polyacrylamide through Low-pressure Ultraviolet Initiation

By : Xinxi Zhang, Jiangya Ma, Kun Fu, Xue Fu, Lei Ding, Jun Shi, Liyan Jian, Qingqing Guan

Page No: 129-143

Abstract
The purpose of this study is to synthesize nano chitosan modified polyacrylamide (P(AM/NCS)) flocculants through low-pressure ultraviolet initiation with 2-hydroxy-4'- (2-hydroxyethoxy)-2- methylpropiophenone (BASF) as photo-initiator. The proposed nano chitosan was sourced from ionic gelation reaction of chitosan (CS) with tripolyphosphate (TPP) in the laboratory. The effect of the reaction conditions, such as mass ratio of AM to NCS, initiator dose, acetic acid (HAc) concentration, stirring time and photoperiod, on grafting polymerization was investigated through the single factor approach and orthogonal array. Scanning electron microscope (SEM) with fractal dimension (Df ), Fourier Transform-Raman spectra and nuclear magnetic resonance spectroscopy (NMR) were employed to reveal the morphologies and chemical structure, respectively. It was found that the highest temperature in photo-initiated polymerization only reached to 40.8°C, and the Df was improved to 1.443 under the low pressure ultraviolet initiation. The copolymer with grafting of 920%, solids content of 9.5% and intrinsic viscosity of 2.9dL/g was obtained at the optimum synthesis conditions: mass ratio of AM to NCS of 9:1, initiator dose of 0.2g, HAc concentration of 2%, stirring time of 25 min and photoperiod of 3h.

Authors :
Xinxi Zhang, Jiangya Ma, Kun Fu, Xue Fu, Lei Ding, Jun Shi And Liyan Jian : School of Civil Engineering and Architecture, Anhui University of Technology, Maanshan, Anhui, 243002, China
Qingqing Guan : Nanjing Institute of Technology, School of Environmental Engineering, Jiangsu, Nanjing, 211167, China