Kinetics of acrylate emulsion polymerization containing hydrophilic hydroxyl acrylate monomer

Kinetics of acrylate emulsion polymerization containing higher level of hydrophilic hydroxyl monomer was carried out.The effects of reaction temperature,the level of emulsifier,initiator,and hydrophilic hydroxyl methacrylate(HEMA) on the monomer conversion and polymerization rate were investigated.The results showed that the temperature and the level of initiator had great influence on the emulsion polymerization system,the ideal polymerization temperature was 75 ℃,and apparent active energy was 62.3 kJ/mol.As the concentration of emulsifier [S] or initiator [I] increased,the polymerization rate(Rp) increased,the relationship was Rp∝0.436×[S] and Rp∝1.57×[I].There existed inducing period when acrylate emulsion polymerization was carried out in the presence of hydrophilic monomer.The concentration of HEMA() had a little of influence on initial monomer conversion,but final monomer conversion increased with the increase of HEMA level.The relationship of polymerization rate and was Rp∝-0.13×.