Preparation of Sodium Polyacrylate with Higher Molecular Weight Assisted by Photo-initiation

Sodium polyacrylate was prepared using acrylic acid and sodium hydroxide as raw materials,and ammonium persulfate/sodium hydrogen sulfite/V-50 as initiator by assistance of photo-initiation.The effects of initiator dosage,pH,monomer concentration and reaction temperature on polymerization results were examined.The obtained optimum conditions were pH=7,V-50 concentration 0.02%,ammonium persulfate concentration and sodium hydrogen sulfite concentration 0.075%,m(ammonium persulfate):m(sodium hydrogen sulfite)=2:1,reaction temperature 20 ℃ and monomer concentration 35%.Under above conditions,the molecular weight of product was 1.34×107 and the dissolving time was 26 min.