Journal
POLYMER CHEMISTRY
Volume 12, Issue 37, Pages 5328-5335Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1py00890k
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Funding
- National Natural Science Foundation of China [21801049]
- Opening Project of Key Laboratory of Polymer Processing Engineering (South China University of Technology) (KFKT 2006), Ministry of Education
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An organocatalytic sequential ring-opening polymerization approach was developed for the synthesis of polysulfonamide-based copolymers, allowing for precise control of molar masses and dispersities. The method involves the use of alcohols and methoxylpolyethylene glycols as initiators, followed by tosyl isocyanate-mediated transformations and ROP reactions. Well-defined triblock and star-shaped copolymers can be successfully prepared from diol and triol initiators.
We report an organocatalytic sequential ring-opening polymerization (ROP) approach for the facile synthesis of polysulfonamide-based copolymers. Alcohols and methoxylpolyethylene glycols were initially employed as (macro)initiators for the ROP of N-sulfonyl aziridines to produce well-controlled polymers with the assistance of tosyl isocyanate. Tosyl isocyanate efficiently transformed the hydroxyl species into the tosylcarbamate anion, the initiating site for the ROP of N-sulfonyl aziridines. ROP of epsilon-caprolactone or propylene oxide was then performed in bulk in the presence of the phosphazene base t-Bu-P-2 or t-Bu-P-4, followed by end-group transformation with tosyl isocyanate and the subsequent ROP of N-sulfonyl aziridines. The synthesized poly(epsilon-caprolactone)-block-polysulfonamide and poly(propylene oxide)-block-polysulfonamide copolymers showed a remarkable control of molar masses and dispersities. Well-defined triblock and 3-arm star-shaped copolymers were successfully prepared from diol and triol initiators.
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