Research On Copolymerization And Properties Of Cpam

In this paper the binary cationic polyacrylamide copolymers were prepared from acrylamide (AM) with cationic monomer acryloyloxyethyl trimethyl ammonium chloride (DAC) and methyl-acryloyloxyethyl trimethyl ammonium chloride (DMC), respectively. UV-induced free radical polymerization was used.The structure of CPAM was determined by Fourier Transform Infrared Spectroscopy (IR) and 1H Nuclear Magnetic Resonance (1H NMR). The results show that P(AM-DAC) could be obtained by the copolymerization of AM and DAC; P(AM-DMC) could be obtained by the copolymerization of AM and DMC; the monomer reactivity-ratio of AM-DAC was r1=1.051, r2=0.838; that of AM-DMC was r1=0.617, r2=2.142, the copolymerization of AM-DMC and AM-DAC were non-ideal copolymerization.Effecting factors for synthesis of the process of CPAM, such as cationic monomers, solid content, the molar ratio of monomer, UV irradiation time, type and dosage of photoinitiator were investigated in this paper. The results show that the monomer conversion rate had small change with the changes of synthesis condition and formulation; as the increase of solid content, the intrinsic viscosity of CPAM increased first and then decreased, while the cationic degree decreased and then increased; as the increase of molar ratio of monomer, the intrinsic viscosity of CPAM increased, while the cationic degree decreased; as the extension of illumination time, the intrinsic viscosity of P (AM-DMC) increased first and then decreased, the intrinsic viscosity of P (AM-DAC) showed a rising trend, the cationic degree of CPAM had small change; with the increase of dosage of photoinitiator, the intrinsic viscosity and cationic degree of CPAM increased first and then decreased.The intrinsic viscosity [η], flocculation property, molecular weight and its distribution of CPAM were determined by Ubbelohde Viscometer, Visible Range Spectrophotometer and Gel Permeation Chromatography (GPC), respectively, the cation degree of CPAM was calculated according to 1H NMR spectra. The results show that the synthesizing process conditions of P(AM-DMC) was UV irradiation time of 6 min, solid content of 20wt%, AM: DMC of 4:1, initiator of photoinitiators of 184, dosage of initiator 1‰. The cationic degree of P(AM-DMC) preparated was 17.75% and intrinsic viscosity is 151.31 ml/g, the viscosity-average molecular weight distribution of P(AM-DMC) was 2.8 million to 4.6 million, lager flocculation constituent were formed during the process of flocculation, and seperated easily, the absorbance of the upper clear liquid was 57.3%; the process synthesizing condition of P(AM-DAC) was UV irradiation time of 6 min, solid content of 20wt%, AM: DMC of 4:1, initiator of photoinitiators was 184, dosage of initiator 1‰, the cationic degree of P(AM-DMC) preparated was 31.17% and intrinsic viscosity was 167.46 ml/g, the viscosity-average molecular weight distribution of P(AM-DAC) was 1.25 million to 3 million, lager flocculation constituent were appeared in the process of flocculation, and seperated easily, the absorbance of the upper clear liquid was 52.8%.