摘要：

With industrial monomer solution of dimethyldiallylammonium chloride(DMDAAC) as raw material,ammonium persulphate(APS) as initiator and Na_4EDTA as chelating agent,using the methods of adding initiator all at once,graduated increasing of temperature and stepwise initiation and polymerization,the polymerization process of preparing poly-dimethyldiallylammonium chloride(PDMDAAC) was researched.The influencing factors such as initial content of monomer w(DMDAAC)(A),m(APS):m(DMDAAC)(B),m(Na_4EDTA):m(DMDAAC)(C) and the temperature of initiation(D) on the intrinsic viscosity of PDMDAAC were investigated via the orthogonal experimental method.The results showed that the functional strength order of the factors was ABDC,and the optimal process conditions were A=65.0%,B=0.35%,C=0.007%,and polymerization carried out at 44 ℃,50 ℃ and 70 ℃,each for 3 h.The intrinsic viscosity of PDMDAAC and conversion rate of monomer under optimal process conditions reached 1.59 dL·g~(-1) and 95% respectively.The highest value of intrinsic viscosity of PDMDAAC was 1.71 dL·g~(-1),and the corresponding monomer conversion rate was 94%.Structure of the product was characterized via ~1HNMR,~(13)CNMR and FTIR spectra.

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