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Lewis pair catalyzed highly selective polymerization for the one-step synthesis of AzCy(AB)xCyAz pentablock terpolymers

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Abstract

A key challenge in polymer chemistry is to regulate the polymer sequence and architecture from versatile monomer mixtures. Here we describe the triethylborane/1,8-diazabicyclo[5.4.0]undec-7-ene (Et3B/DBU) pair catalysed highly selective terpolymerization of mixtures of propylene oxide (PO), phthalic anhydride (PA) and racemic lactide (rac-LA), wherein the catalytic efficiency and the polymerization selectivity are significantly correlated to the Et3B/DBU feed ratio. With H2O as a cheap and efficient initiator, the Et3B/DBU pair (1/1) demonstrates chemoselective control over the ring-opening copolymerization (ROCOP) of PO/PA and the ring-opening polymerization (ROP) of rac-LA, while the Et3B/DBU pair (2/1) additionally allows for the discrimination of rac-LA and PO in ROP via kinetic control, affording one-step access to unique AzCy(AB)xCyAz pentablock terpolymers (Đ < 1.15) without transesterification scrambling.

Graphical abstract: Lewis pair catalyzed highly selective polymerization for the one-step synthesis of AzCy(AB)xCyAz pentablock terpolymers

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Article information


Submitted
07 Oct 2019
Accepted
23 Jan 2020
First published
24 Jan 2020

Polym. Chem., 2020, Advance Article
Article type
Communication

Lewis pair catalyzed highly selective polymerization for the one-step synthesis of AzCy(AB)xCyAz pentablock terpolymers

S. Zhu, Y. Wang, W. Ding, X. Zhou, Y. Liao and X. Xie, Polym. Chem., 2020, Advance Article , DOI: 10.1039/C9PY01508F

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