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Aqueous Two-phase Copolymerization of Acrylamide and Cationic Monomers

Author: ZhaoLiang
Tutor: DanGuoRong
School: Zhejiang University
Course: Chemical Engineering
Keywords: Aqueous two-phase copolymerization Acrylamide Cationic monomer Ammonium sulfate Polyethylene glycol
CLC: TQ316.3
Type: Master's thesis
Year: 2006
Downloads: 338
Quote: 12
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Abstract


Polyacrylamide (PAM) is acrylamide (AM) and its derivatives of homopolymers and copolymers referred to, is a linear water-soluble polymers, are widely used in water treatment, papermaking, oil and other industrial sectors. Foreign use of cationic polyacrylamide is a wide range of domestic, but more backward production technology, product quality is not high, and very difficult to meet user requirements. Aqueous two-phase polymerization concept is at the end of the last century, both the of acrylamide aqueous two-phase polymerization system has been research study also rarely reported acrylamide copolymerization in aqueous two-phase system. The papers as a starting point, the proposed use of the the total aqueous two-phase polymerization reaction of new methods for the preparation of water-soluble polymer copolymer. The aqueous two-phase polymerization (Aqueous two-phase polymerization) is a novel polymerization system is a water-soluble monomer is dissolved in an aqueous solution of another water-soluble substance, the formation of homogeneous mixtures, and then polymerized under certain conditions immiscible water-soluble polymer dispersion is formed, the polymerization reaction. The relatively low viscosity of the reaction system, large solids, and the problem does not exist in the polymerization process, the organic solvent pollution, and has broad application prospects and environmental value. Cationic monomer and acrylamide aqueous two-phase copolymerization is an extension of acrylamide aqueous two-phase polymerization, the introduction of a cationic monomer, more in line with the needs of the industrial development of the water-soluble polymer, which overcomes the ordinary aqueous solution agitator and heat transfer difficult problems, but also improves the stability of the system. This thesis research as the dispersion medium by ammonium sulfate, ammonium sulfate-PAM-water system phase behavior, measured under different temperature phase diagram. Determination of the impact of different temperature, PEG, PAM concentration on the partition coefficient of the cationic monomer is methacryloyloxy ethyl trimethyl ammonium chloride (DMC), in a polyethylene glycol (PEG)-PAM-water system Flory-Huggins model thermodynamic description of PEG-PAM-water system. The PAM-PEG-H 2 O dual water phase polymerization system PEG in aqueous solution of the continuous phase, PAM aqueous solution for the dispersed phase through the droplet morphology and droplet size distribution study proposed droplet formation and stabilizing mechanism. The following reasons prompted the droplets can be stably dispersed in the continuous phase: steric effect, the charge repulsion of the cationic monomer. Found by comparison with homopolymerization system, the stability of the cationic copolymerization system is superior to the system under the same conditions homopolymerization. Were studied in a homogeneous aqueous system cationic monomers DMC methacrylate, dimethylamino methacrylate (DM) and acrylamide co-polymerization kinetics obtained Copolymerization rate, and gives the reactivity rate of 95%, 99% of the joint confidence region. Compare a homogeneous aqueous solution of the polymerization system, and aqueous two-phase copolymerization system of revolutions

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CLC: > Industrial Technology > Chemical Industry > Molecular compound Industries ( polymer industry ) > Production process > Polymerization process.
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