Browsing by Keyword "Copolymerization"
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Item Synthesis of cationic flocculants by the inverse microemulsion copolymerization of acrylamide with 60% 2-acryloxyethyltrimethyl ammonium chloride in the monomer feed. I. Initiation by ammonium persulfate/sodium disulfite redox system(2007-03-05) Escudero Sanz, F. J.; Ochoa Gómez, J. R.; Sasia, P. M.; De Apodaca, E. Díaz; Río, P.; Tecnalia Research & Innovation; Alimentación Sostenible; ECONOMÍA CIRCULARAcrylamide/2-acryloxyethyltrimethyl ammonium chloride copolymers in inverse microemulsion, with a cationic charge density of 60% and a concentration of active matter of 30 wt %, of interest as flocculants have been obtained by inverse microemulsion copolymerization. Interesting inverse microemulsion formulations from both industrial and economical standpoints were selected from pseudoternary phase diagrams. These formulations were polymerized by semicontinuous free radical copolymerization in inverse microemulsion using sodium disulfite and ammonium persulfate as initiators. Influence of initiators and initiator addition conditions (specific flow rate and concentration) on semicontinuous polymerization and final product properties as flocculants have been studied. A strong difference in copolymer solution viscosity has been found when an aqueous solution of sodium disulfite is used as initiator instead of sodium disulfite/ammonium persulfate couple redox, specially for low sodium disulfite solution feeding flow.Item Synthesis of cationic flocculants by the inverse microemulsion copolymerization of acrylamide with 60% 2-acryloxyethyltrimethyl ammonium chloride in the monomer feed. II. influence of the formulation composition, hydrophilic-lipophilic balance, starting polymerization temperature, and reaction time(2007-01-05) Ochoa, J. R.; Escudero Sanz, F. J.; Sasia, P. M.; García, A. Santos; Díaz De Apodaca, E.; Río, P.; Tecnalia Research & Innovation; Alimentación Sostenible; ECONOMÍA CIRCULARAcrylamide/2-acryloxyethyltrimethylammonium chloride copolymers in inverse microemulsions, with 60% 2-acryloxyethyltrimethyl ammonium chloride in the monomer feed and a concentration of active matter of 30% (w/w) as flocculants, were obtained by inverse micro-emulsion copolymerization. Inverse microemulsion formulations of comonomers, interesting from both technical and economical viewpoints, were polymerized by semicontinuous free-radical copolymerization with sodium disulfite as the initiator. The influence of the formulation composition, hydrophilic-lipophilic balance (HLB), starting polymerization temperature, and reaction time on the polymerization and final properties of the products as flocculants was studied.