Carbodiimide Ring-Opening Metathesis Polymerization.

Carbodiimide Ring-Opening Metathesis Polymerization.
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DOI:
10.1021/acscentsci.3c00032
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发表时间:
2023-06-28
影响因子:
18.2
通讯作者:
Zhukhovitskiy, Aleksandr V.
Zhukhovitskiy, Aleksandr V.
中科院分区:
化学1区
文献类型:
--
作者:
Johnson, J. Drake;Kaplan, Samuel W.;Toth, Jozsef;Wang, Zian;Maw, Mitchell;Sheiko, Sergei S.;Zhukhovitskiy, Aleksandr V.

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Controlled incorporation of nitrogen into macromolecular skeletons is a long-standing challenge whose resolution would enable the preparation of soft materials with the scalability of man-made plastics and functionality of Nature’s proteins. Nylons and polyurethanes notwithstanding, nitrogen-rich polymer backbones remain scarce, and their synthesis typically lacks precision. Here we report a strategy that begins to address this limitation founded on a mechanistic discovery: ring-opening metathesis polymerization (ROMP) of carbodiimides followed by carbodiimide derivatization. An iridium guanidinate complex was found to initiate and catalyze ROMP of N-aryl and N-alkyl cyclic carbodiimides. Nucleophilic addition to the resulting polycarbodiimides enabled the preparation of polyureas, polythioureas, and polyguanidinates with varied architectures. This work advances the foundations of metathesis chemistry and opens the door to systematic investigations of structure-folding-property relationships in nitrogen-rich macromolecules. ROMP of aryl and alkyl carbodiimides initiated and catalyzed by an iridium guanidinate produced polymeric carbodiimides that were derivatized to a series of heteroatom-rich polymers.
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