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Preparation of poly(acrylamide- co-acrylic acid) aqueous latex dispersions using anionic polyelectrolyte as stabilizer
Ist Teil von
Colloids and surfaces. A, Physicochemical and engineering aspects, 2007-12, Vol.311 (1), p.131-139
Ort / Verlag
Amsterdam: Elsevier B.V
Erscheinungsjahr
2007
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
High-solids, low-viscosity, stable poly(acrylamide-
co-acrylic acid) aqueous latex dispersions were prepared by the dispersion polymerization of acrylamide (AM) and acrylic acid (AA) in an aqueous solution of ammonium sulfate (AS) medium using anionic polyelectrolytes as stabilizers. The anionic polyelectrolytes employed include poly(2-acrylamido-2-methylpropanesulfonic acid sodium) (PAMPSNa) homopolymer and random copolymers of 2-acrylamido-2-methylpropanesulfonic acid sodium (AMPSNa) with methacrylic acid sodium (MAANa), acrylic acid sodium (AANa) or acrylamide (AM). The influences of stabilizer's structure, composition, molecular weight and concentration, AA/AM molar feed ratio, total monomer, initiator and aqueous solution of AS concentration, and stirring speed on the monomer conversion, the particle size and distribution, the bulk viscosity and stability of the dispersions, and the intrinsic viscosity of the resulting copolymer were systematically investigated. Polydisperse spherical as well as ellipsoidal particles were formed in the system. The broad particle size distributions indicated that coalescence of the particles takes place to a greater extent. The chemical structures of the final formed copolymers were characterized by FTIR and
13C NMR. The result obtained by
13C NMR was excellent agreement between the feed monomer compositions and the final copolymer compositions.