Functional PEG building blocks via copolymerization of ethylene carbonate and tert-butyl glycidyl ether. Issue 31 (25th July 2016)

• Record Type: Journal Article
• Authors: Kapiti, G.; Keul, H.; Möller, M.
• Is Part Of: Polymer chemistry. Volume 7:Issue 31(2016)
• Page Start: 5050
• Page End: 5059
• Publication Date: 2016-07-25
• Subjects: Polymers -- Periodicals; Macromolecules -- Periodicals; Polymerization -- Periodicals; 547.705
• DOI: 10.1039/c6py00768f
• Languages: English
• ISSNs: 1759-9954

Abstract

Abstract : Functional poly(ethylene glycol) building blocks were synthesized with ethylene carbonate as a new source for ethylene oxide repeating units. Abstract : Anionic ring opening copolymerization of ethylene carbonate (EC) and tert -butyl glycidyl ether (TBGE) with CsOH as an initiator using a mono-mode microwave reactor results in poly(EO- co -TBGE) hydroxy telechelic copolymers with Mn (SEC) values between 750 and 1700 g mol −1 and dispersity indices in the range of Đ = 1.05–1.10. The reaction sequence for the formation of narrowly distributed copolymers was investigated by kinetic studies using size exclusion chromatography, 1 H NMR and MALDI-ToF as analytical tools. Transcarbonylation, transalkylation and carbonate fragmentation were identified as fundamental reactions for the formation of carbonate free products with multi block microstructures. 13 C NMR analysis allowed the determination of monomer sequences within the polymer chain, which confirmed its multi block type structure; different microstructures were obtained by varying the reaction time and monomer composition.