Abstract
Graft copolymers of Chitosan-Bromo 2-(trimethylammono) ethyl acrylate were prepared by the reactions of chitosan with brom 2-(trimethylammono) ethyl acrylate. The flocculating ability for 5% kaolin suspension was invesigated in relation to the structure of graft copolymers by measuring the sedimentation rate.the residual turbidity, and the sedimentation volume.
The results obtained were as follows.1) For every copolymer, the optimum flocculating ability was obtained in the concentration of nearly 10 ppm and an isoelectric point was observed in the same copolymer dosage.2) Suitable graft chain length (F2) for the flocculating ability was about 0.2∼0.5.3) An isoelectric point was found in the vicinity of pH 5 and the optimum flocculating ability was observed in the same pH. 4) Suitable pH for good flocculating action was observed in the pH range of 2∼10.5) Copolymers obtained was more effective for the flocculation than typical commercial fiocculants such as Sumi fioc FC, PAS-A, and Himoloc Neo 600.
