Houck H, McConnell KA, Klingler CJ, Koenig AL, Himka GK, Larsen MB. Postpolymerization Modification by Nucleophilic Addition to Styrenic Carbodiimides.
ACS Macro Lett 2023;
12:1112-1117. [PMID:
37485980 PMCID:
PMC10433525 DOI:
10.1021/acsmacrolett.3c00382]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Accepted: 07/20/2023] [Indexed: 07/25/2023]
Abstract
Carbodiimides are electrophilic functional groups that react with select nucleophiles under mild conditions. However, their potential as platforms for postpolymerization modification has been relatively underexplored. We describe the synthesis and radical polymerization of a styrenic carbodiimide which undergoes rapid nucleophilic addition with primary and secondary alkyl amines under ambient conditions, even in the presence of other protic nucleophiles. The monomer is amenable to both free and controlled radical (co)polymerization, and we further demonstrate the utility of this approach by preparing covalent adaptable networks through guanylation of the styrenic carbodiimide with difunctional amines. These materials exhibit a variation in relaxation times according to both the guanidine structure and concentration, providing a facile means for tuning dynamic behavior.
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