科研之友
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摘要
Polydithiocarbamates are a group of promising functional polymer materials with unique mechanical property and dynamic reversible property, however, the exploration of structures and functionalities of these polymers are limited by the synthetic approaches. In this work, considering the problems regarding the side reactions and low efficiency in the reaction of elemental sulfur, isocyanide, and thiol, one-pot two-step tandem strategy, organic bases, and reaction temperature were carefully designed to improve the efficiency and selectivity of the reaction. The organic base-catalyzed multicomponent tandem polymerizations of elemental sulfur, diisocyanides and dithiols were developed, with N, N-diisopropylethylamine as the base in DMSO, affording polydithiocarbamates with M(n)s of up to 1.77x10(4) g/mol. The polymerization was mild and convenient, which could be applied to both aliphatic and aromatic isocyanides, to synthesize polydithiocarbamates with different structures. These polymers possessed good thermal stability, and could be degraded to oligomers in the presence of thiol. The multicomponent tandem polymerizations could provide a mild and convenient synthetic approach for polydithiocarbamates, which may accelerate the development of these sulfur-containing degradable polymer materials. @@@ [GRAPHICS] @@@ .
