Hyperbranched polyesters based on hydroxyalkyl‐lactones via thiol‐ene click reaction |
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| Authors: | Olesja Stöhr Helmut Ritter |
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| Affiliation: | Institute of Organic Chemistry and Macromolecular Chemistry, Heinrich‐Heine‐University of Duesseldorf, Duesseldorf, Germany |
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| Abstract: | The preparation of AB2 monomers via thiol‐ene click reaction from six‐ and seven‐membered unsaturated lactones is described. The hydroxyl‐functionalized valerolactone was prepared by use of Michael thiol‐ene‐addition reaction starting from 2‐mercaptoethanol and 3‐methylenetetrahydro‐2H‐pyran‐2‐on. The hydroxyl‐functionalized caprolactone was prepared radically from 2‐mercaptoethanol and 7‐allyloxepan‐2‐one. Both AB2 monomers were polymerized via ring opening in the presence of tin(II)‐2‐ethylhexanoate (Sn(Oct)2) as a catalyst yielding the hyperbranched polyesters. The new hyperbranched polyesters were analyzed by 13C NMR spectra to determine the degree of branching. © 2014 Society of Chemical Industry |
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| Keywords: | hyperbranched aliphatic polyester thiol‐ene click reaction ring opening polymerization |
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