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Open AccessFeature PaperArticle

Controlled Synthesis of Polyphosphazenes with Chain-Capping Agents

Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA 15213, USA
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Author to whom correspondence should be addressed.
Current address: 2217 Forest Avenue, Ashland, KY 41101, USA.
Academic Editors: Sławomir Rubinsztajn, Marek Cypryk and Wlodzimierz Stanczyk
Molecules 2021, 26(2), 322; https://doi.org/10.3390/molecules26020322
Received: 20 December 2020 / Revised: 5 January 2021 / Accepted: 7 January 2021 / Published: 10 January 2021
N-alkyl phosphoranimines were synthesized via the Staudinger reaction of four different alkyl azides with tris(2,2,2-trifluoroethyl) phosphite. N-adamantyl, N-benzyl, N-t-butyl, and N-trityl phosphoranimines were thoroughly characterized and evaluated as chain-capping compounds in the anionic polymerization of P-tris(2,2,2-trifluoroethoxy)-N-trimethylsilyl phosphoranimine monomer. All four compounds reacted with the active chain ends in a bulk polymerization, and the alkyl end groups were identified by 1H-NMR spectroscopy. These compounds effectively controlled the molecular weight of the resulting polyphosphazenes. The chain transfer constants for the monomer and N-benzyl phosphoranimine were determined using Mayo equation. View Full-Text
Keywords: N-alkyl phosphoranimines; polyphosphazenes; phosphoramidate esters; fluoride; trifluoroethoxide; N-methylimidazole initiators; anionic; chain-capping agents N-alkyl phosphoranimines; polyphosphazenes; phosphoramidate esters; fluoride; trifluoroethoxide; N-methylimidazole initiators; anionic; chain-capping agents
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MDPI and ACS Style

Montague, R.A.; Matyjaszewski, K. Controlled Synthesis of Polyphosphazenes with Chain-Capping Agents. Molecules 2021, 26, 322. https://doi.org/10.3390/molecules26020322

AMA Style

Montague RA, Matyjaszewski K. Controlled Synthesis of Polyphosphazenes with Chain-Capping Agents. Molecules. 2021; 26(2):322. https://doi.org/10.3390/molecules26020322

Chicago/Turabian Style

Montague, Robert A.; Matyjaszewski, Krzysztof. 2021. "Controlled Synthesis of Polyphosphazenes with Chain-Capping Agents" Molecules 26, no. 2: 322. https://doi.org/10.3390/molecules26020322

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