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- W2890763447 abstract "Stereoselective zwitterionic ring-opening polymerization (ZROP) poses a potentially great challenge in polymer chemistry because of its unique ion-pairing catalysis mechanism. Herein, a stereoselective ZROP of rac-lactide (rac-LA) was explored for synthesis of isotactic cyclic polylactides by using commercially available N-heterocyclic carbene (NHC) catalysts at low temperature in tetrahydrofuran. The epimerization of lactide during ZROP can be inhibited at low temperature. The best isoselectivity can reach to a high value of Pm = 0.91 associated with a high melting point (Tm) of 193 °C. The resulting polylactides exhibit narrow molecular weight distributions (Mw/Mn < 1.2) and inhibited transesterification as evidenced by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS). The resulting polylactide is predominantly cyclic as evidenced by 1H NMR and MALDI-TOF MS analyses." @default.
- W2890763447 created "2018-09-27" @default.
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- W2890763447 date "2018-10-01" @default.
- W2890763447 modified "2023-10-16" @default.
- W2890763447 title "Stereoselective zwitterionic ring-opening polymerization of rac-lactide" @default.
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- W2890763447 doi "https://doi.org/10.1016/j.polymer.2018.09.004" @default.
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