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摘要
The cationic polyelectrolyte of P(CMTC-DMC-AM) was synthesized by dispersion polymerization in aqueous solution of ammonium chloride, using acrylamide (AM) and dimethylaminoethyl methacrylate methyl chloride (DMC) as main raw materials, N-carboxymethylthioureidochitosan (CMTC) as both one of reactants and the stabilizer, 2,2'-azobis(2-amidinopropane) dihydrochloride (V-50) as the initiator. The effects of the major reaction variables, such as the mass proportion of CMTC and the monomers, the mass ratio between monomers and the total amount of the reactants were investigated. In addition, the product was characterized by Fourier transform infrared (FTIR) spectroscopy and proton nuclear magnetic resonance ((1)H NMR) spectroscopy. The results showed that CMTC had participated in the polymerization process with DMC and AM by the function of initiator under certain conditions. The product agglomerated when the mass proportion of CMTC, AM and DMC was less than 0.67:6.0:6.0, while particles would be flocculated due to the flocculation action of CMTC when the proportion was up to 0.67:4.0:4.0. The molecular weight increased with the increase of DMC, but the product agglomerated when the proportion of AM to DMC was less than 3:8. The total concentration of CMTC, AM and DMC also influenced the polymerization enormously. At high concentrations, the dispersion was disturbed by agglomeration due to coalescence or cross-linking of the polymer chains. At lower concentration, the molecular weight greatly decreased, due to insufficient adsorption of monomers on the particles. The optimum reaction conditions for obtaining a stable aqueous dispersion were concentrations of 0.67 g, 5.5 g and 5.5 g per 100 mL de-ionized water for CMTC, AM and DMC, respectively, under the conditions of 32 g for ammonium chloride and 0.0105 g for initiator and reaction temperature of 60 degrees C for 5 h.
- 出版日期2011-11
- 单位青岛科技大学
