Preparation and Application of Chitosan-AM-DMC Grafted Copolymer
The graft copolymerization of acrylamide(AM)and methyl acryloyl oxyethyi trimethyl ammonium chloride (DMC)onto chitosan initiated by potassium persulfate(KPS)was studied.The percentage of grafting(％G)was around 150％with the grafting efficiency(％E)of around 30％.The IR spectra of the unmodified chitosan and the grafted copolymer were determined to verify the chitosan-AM-DMC copolymer.The grafted copolymer was used as the dry-strengthening agent for wheat straw pulp.The experimental results showed that the optimum synthesis conditions of graft copolymerizing were as follows: reaction temperature of 55℃,reaction time of 4h,dripping time of monomer of 30min,the concentration of KPS of 4mmol.L-1,m(CS ): m(AM): m(DMC)=1:6:2,the concentration of NaHSO3 of 1mmolL-1.The breaking length and burst index of the handsheets increased by 22.4％ and 23.4％ respectively with 1.0％ dosage of the grafted copolymer.The strengthening effect of the copolymer was much better than the unmodified chitosan.Finally the dry-strengthening mechanism of chitosan-AM-DMC was studied by comparing the SEM results of the rupture section of handsheets treated with or without chitosan-AM-DMC copolymer.
chitosan acrylamide DMC graft copolymerization paper dry-strengthening agent
MA YONGSHENG WANG LINTONG MENG QINGGUO ZHANG YUNCHEN
Department of Chemistry and Chemical Engineering,Weifang University No.5147,Dongfeng East Street,Weifang,261061,Shandong Province,China
国际会议
第二届国际造纸与环境学术会议(The Second International Papermaking & Environment Conference)
天津
英文
711-714
2008-05-14（万方平台首次上网日期，不代表论文的发表时间）