Jump to main content
Jump to site search


Phosphazene/Triisobutylaluminum Promoted Anionic Ring-Opening Polymerization of 1,2-Epoxybutane Initiated by Secondary Carbamates

Abstract

Attempts to use carbamate-phosphazene base as initiating systems for the polymerization of 1,2-epoxybutane were unsuccessful. As a matter of fact, carbamate deprotonation by phosphazene bases led to their fast decomposition generating alkoxide anions which initiate the polymerization rather than carbamate anions. Conversely, in the presence of triisobutylaluminum -a Lewis acid- the in situ generation of an anionic initiator X- obtained by the deprotonation of with tBuP4 phosphazene base was tested as possible way to initiate the polymerization of 1,2-epoxybutane. A particular attention was given to the detection of eventual transfer or side-reactions according to the carbamate:triisobutylaluminum:phosphazene base ratio, to the solvent dielectric constant and to the number of P=N- units in the phosphazene base. Reaction performed with the stoichiometric ratio (1:1:1) of carbamate:triisobutylaluminum:tBuP2, gave the best results. Under these conditions, the initiation of the polymerization by the carbamate anion quantitative; no transfer reactions have been observed and the polymerization proceeded in a controlled manner to afford amide end-capped poly(butylene oxide) with narrow molar mass distribution and expected molar masses.

Back to tab navigation

Supplementary files

Publication details

The article was received on 21 Apr 2017, accepted on 13 Jun 2017 and first published on 13 Jun 2017


Article type: Paper
DOI: 10.1039/C7PY00675F
Citation: Polym. Chem., 2017, Accepted Manuscript
  •   Request permissions

    Phosphazene/Triisobutylaluminum Promoted Anionic Ring-Opening Polymerization of 1,2-Epoxybutane Initiated by Secondary Carbamates

    L. HASSOUNA, N. Illy and P. Guegan, Polym. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7PY00675F

Search articles by author

Spotlight

Advertisements