Abstract:

The initiation reaction of sulfite (SO₃^2-) and persulfacte (S₂O₈^2-) system in acrylamide polymerization has been studied in this paper. Results has indicated that the mole ratio of reductant to oxidant in initiation system influences remarkably on the decomposition rate constant and the polymerization rate. When the mole ratio of SO₃^2- to S₂O₈^2- is 6.7/10 at 30℃, the decomposition rate constant of initiation system and the polymerization rate of acrylamide have reached their maximums respectively. The law that the decomposition rate constant changes with the mole ratio of reductant to oxidant in the initiation system has been discovered. The range of value of the decomposition rate constant has been presented. The catalysis was considered as a reason that the decomposition rate constant changes with the mole ratio of reductant to oxidant in initiation system.

Key words: initiation, rate constant, polymerization rate, catalysis