The first versatile gas-controlled polymerization switch based on reversible absorption of CO 2 by organic amidine was developed. The amidine/alcohol system, which originally belonged to CO 2 binding organic liquids, served as an efficient CO 2 -responsive catalyst/initiator system for lactide polymerization. Chemoselective block copolymerization between polylactide and polycarbonate was further explored by opposite gas-controlled amidine and another Cr III catalyst, where an immortal strategy was developed for conjugated alternation of inverse polymerizations on different active species and permits many potential applications.
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Hu et al. (2018) studied this question.
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