Journal
JOURNAL OF APPLIED POLYMER SCIENCE
Volume 113, Issue 4, Pages 2693-2701Publisher
WILEY
DOI: 10.1002/app.30372
Keywords
water-soluble polymers; dispersions; radical polymerization; phase separation
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Funding
- National Natural Science Foundation of China [20476102, 50673089]
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High-solids, low-viscosity, stable polyacrylamide (PAM) aqueous dispersions were prepared by dispersion polymerization of acrylamide in aqueous solution of ammonium sulfate (AS) using Poly (sodium acrylic acid) (PAANa) as the stabilizer, ammonium persulfate (APS) or 2,2'-Azobis (N,N'-dimethyleneisobutyramidine) dihydrochloride (VA-044) as the initiator. The molecular weight of the formed PAM, ranged from 710, 000 g/mol to 4,330,000 g/mol, was controlled by the addition of sodium formate as a conventional chain-transfer agent. The progress of a typical AM dispersion polymerization was monitored with aqueous size exclusion chromatography. The influences, of the AS concentration, the poly(sodium acrylic acid) concentration, the initiator type and concentration, the chain-transfer agent concentration and temperature Oil the monomer conversion, the dispersion viscosity, the PAM molecular weight and distribution, the particle size and morphology were systematically investigated. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 113: 2693-2701, 2009
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