Acta Phys. -Chim. Sin. ›› 1993, Vol. 9 ›› Issue (05): 679-683.doi: 10.3866/PKU.WHXB19930520

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Study on the Dissociation of A New Cationic Polyacrylamide

Zhang Qing-Da; Li Zhuo-Mei   

  1. Institute of Polymer Science, Zhongshan University, Guangzhou 510275
  • Received:1992-02-10 Revised:1992-09-08 Published:1993-10-15
  • Contact: Li Zhuo-Mei

Abstract: A new kind of cationic polyacrylamide, PAm·MG, has been prepared by the modification of polyacrylamide (—CONH_z) with HCHO and dieyanodiamide. Three PAm·MG species with various degree of substitution (S) have been obtained by varying the ratio HCHO/-CONH_2. They are water-soluble and show effective floccu-lation for the active dyes. PAm·MG is a hydrochloride salt of weak polybase, whose dissociation depends on S, pH, and the concentration of added salt. η_(ap)/C of PAm·MG solution depends also on S and dissociation of the polymer, and on pH of solution as well. All these results are of significance in determining the optimum conditions for the synthesis and use of PAm·MG.

Key words: Polyacrylamide, Cationic polyelectrolete, Dissociation of polybase