Synthesis of Cationic Polymers from Poly(3-chloro-2-hydroxroippyl methacrylate)and Their Flocculating Capabilities

Abstract

Water-soluble cationic polymers were prepared by the amination of poly( 3-chloro-2-hydroxy propyl methacrylate) (P (CHPM)) with triethylamine. To assess the flocculating action of these polymers, kaolin suspension was used. The flocculating ability was studied by measuring the concentration of supernatant suspension in terms of jar tests, the sedimentation rate and sedimented volume. CHPM (10 m /), dissolved in 10 ml isopropyl alcohol, was polymerized in nitrogen at 50°C for O.8 hours using AIBN (0.2 w/v %) as an initiator. The polymer obtained is soluble in several organic solvents and has the molecular weight of about 400 thousands. When P(CHPM)(O.5 g ), dissolved in acetone (20 ml), was aminated with triethyamine (6 moles per monomer unit in the polymer) at 80°C for 5.5 hours, reaction mixture became turbid. Then, water (10 ml) was added to dissolve the precipitates, and the polymer was further aminated for 3 hours. The cationic polymers thus obtained exhibit excellent flocculating properties. The maximum rate of sedimentation is 5.0 cm/min, when the amount of polymer is 0.002% on kaolin in suspension. The relation between flocculating action and extent of cationic polymer in an aqueous solution was discussed.