Hi!!! I'm looking for methods to polymerize acrylic acid in order to obtain a polymer with a Mw of 4000. Currently, I do polymerizations in aqueous media, using two methods: a) Metabisulfite / Persulfate b) Hydrogen Peroxide But, regretfully, the sodium polyacrylate obtained by either method a) or b) is less effective, as clay dispersant, than the same polymer made by Isopropylic alcohol method. Is someone able to give me an answer? How can I improve the polymer effectiveness? Does someone knows another polymerization methods based upon aqueous media?