Preparation of poly(acrylamide-co-acrylic acid) aqueous latex dispersions using anionic polyelectrolyte as stabilizer

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• 作者：Xiaoguang Liu ; Sheng Xiang ; Yumei Yue ; Xuefeng Su ; Wende Zhang ; Chunlei Song ; Pixin Wang
• 关键词：Latex dispersion ; Polyelectrolyte ; Dispersion polymerization ; Acrylamide ; Acrylic acid
• 刊名：Colloids and Surfaces A: Physicochemical and Engineering Aspects
• 出版年：2007
• 出版时间：1 December 2007
• 年：2007
• 卷：311
• 期：1-3
• 页码：131-139
• 全文大小：819 K

文摘

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.