Frontiers in Chemistry (Nov 2018)

Facile Preparation of Stereoblock PLA From Ring-Opening Polymerization of rac-Lactide by a Synergetic Binary Catalytic System Containing Ureas and Alkoxides

  • Ze Kan,
  • Wenlong Luo,
  • Tong Shi,
  • Chuanzhi Wei,
  • Binghao Han,
  • Dejuan Zheng,
  • Shaofeng Liu

DOI
https://doi.org/10.3389/fchem.2018.00547
Journal volume & issue
Vol. 6

Abstract

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Ring-opening polymerization (ROP) of cyclic esters/lactones by efficient catalysts is a powerful method for synthesis of biodegradable and biocompatible polyesters with well-defined structures. To develop catalytic systems that are fast, selective and controlled is a persistent effort of chemists. In this contribution, we report a binary urea/alkoxide catalytic system that could catalyze ROP of rac-LA in a fast (over 90% conversion within 1–2 min), stereoselective (Pi up to 0.93) and controlled manner, indicated by narrow MW distributions, linear relationship between the monomer conversions and Mns, end-group fidelity, and chain extension experiments. Remarkably, the catalytic system described here is simple, easily prepared, and structurally tunable and thus has versatile catalytic performances.

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