Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 61, Issue 7, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202115189
Keywords
Block copolymers; Ring-opening copolymerization; Self-switchable polymerization; Sulfur-rich polymers; Thermoplastic elastomers
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Funding
- Zhejiang Provincial Natural Science Foundation of China [R21B040004]
- National Natural Science Foundation of China [51973186, 91956123, 22101253]
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This study demonstrates a facile method to construct well-defined triblock sulfur-rich thermoplastic elastomers through self-switchable isothiocyanate/episulfide copolymerization and air-assisted oxidative coupling strategy, which can be extended to diverse isothiocyanates and episulfides for fine-tuning the performance of the produced sulfur-rich thermoplastic elastomers.
Construction of well-defined sulfur-rich macromolecules in a facile manner is an interesting but challenging topic. Herein, we disclose how to readily construct well-defined triblock sulfur-rich thermoplastic elastomers via a self-switchable isothiocyanate/episulfide copolymerization and air-assisted oxidative coupling strategy. During self-switchable polymerization, alternating copolymerization of isothiocyanate and episulfide occurs initially due to the lower energy barrier for isothiocyanate insertion with respect to successive episulfide ring-opening. After exhaustion of isothiocyanate, ring-opening polymerization of episulfide begins, providing diblock polymers. Subsequent exposure of the reaction to air leads to a transformation of diblock copolymers into triblock thermoplastic elastomers. This protocol can be extended to diverse isothiocyanates and episulfides, allowing fine-tuning of the performance of the produced sulfur-rich thermoplastic elastomers.
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