New Zinc Dicarboxylate Catalysts for the CO2/Propylene Oxide Copolymerization Reaction: Activity Enhancement Through Zn(II)-Ethylsulfinate Initiating Groups

Robert Eberhardt, Markus Allmendinger, Manuela Zintl, Carsten Troll, Gerrit A. Luinstra, Bernhard Rieger

Research output: Contribution to journalArticlepeer-review

82 Scopus citations

Abstract

A series of zinc dicarboxylates were synthesized by the reaction of diethylzinc with dicarboxylic acids. Zinc monocarboxylate monoalkyl intermediates were obtained by using a defined excess of diethylzinc over dicarboxylic acid. A subsequent insertion reaction of SO2 into these zinc alkyl bonds resulted in a defined number of Znethylsulfinate groups, which act as active centers for the copolymerization reaction of CO2 and propylene oxide. Corresponding ethylsulfinic acid ester end groups were detected in the poly(propylene carbonate) (PPC) products. The polymerization activity depended strongly on the number of sulfinate groups incorporated and has been significantly increased compared to conventional zinc dicarboxylates. The obtained PPCs have molecular weights (M̄w) exceeding 80 000 g · mol-1 and polydispersities in the range of 2.3 to 3.3.

Original languageEnglish
Pages (from-to)42-47
Number of pages6
JournalMacromolecular Chemistry and Physics
Volume205
Issue number1
DOIs
StatePublished - 2 Jan 2004
Externally publishedYes

Keywords

  • Carbon dioxide fixation
  • Copolymerization
  • Heterogeneous catalysis
  • Polycarbonates
  • Zinc glutarate

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