Simultaneous Polymerization by Cationic and Anionic Catalysts

Abstract

In our previous paper simultaneous cationic and anionic polymerizations have been reported to proceed in the case of the graft copolymerization of β-propiolactone with Nvinyl carbazole onto the trunk polymers containing -SO₃ Na or -COOH groups. In this paper, the simultaneous polymerization by cationic and anionic catalysts was carried out in a liquid system for homopolymerization. The cationic and anionic polymerizations were recognized to occur simultaneously at the comparative rates of both cationic and anionic polymerizations, at least in the case having one of the following conditions at ; (i) relatively heterogeneous system. (ii) the reaction medium having high dielectric constant, or (iii) relatively stable growing anionic and cationic ends.