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Synthesis of Bioderived Polycarbonates with Molecular Weight Adjustability Catalyzed by Phenolic-derived Ionic Liquids

Abstract

Synthesis of high-molecular-weight bioderived polycarbonates via green routes and regulation of molecular weight are of great significance but also enormous challenges. Herein, a green sequential approach toward the bio-derived polycarbonates with adjustable molecular weight from isosorbide and dimethyl carbonate (DMC) has been developed by employing ionic liquids (ILs) as a class of eco-friendly catalyst. The structures of IL catalysts are capable of being designed readily to control the molecular weight of isosorbide-derived polycarbonate (PIC), which is an attractive advantage of IL catalysts instead of the conventional metal-containing catalysts. In the presence of [Bmim][4-I-Phen] catalyst, PIC weight-average molecular weight (Mw) can reach to 50300 g/mol. By combination of the experimental results and DFT calculations, an IL’s anion-cation synergistic catalytic polymerization mechanism has been proposed, which reveals that nucleophile electrophile dual activation by H-bonds and charge-charge interactions in catalyzing PIC formation. Further importance of this study is that we propose a guidance of developing IL catalysts for synthesizing higher molecular weight polycarbonates, thereby conveniently preparing a variety of polymers with tunable properties.

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Article information


Submitted
09 Feb 2020
Accepted
05 Mar 2020
First published
06 Mar 2020

Green Chem., 2020, Accepted Manuscript
Article type
Paper

Synthesis of Bioderived Polycarbonates with Molecular Weight Adjustability Catalyzed by Phenolic-derived Ionic Liquids

W. Qian, L. Liu, Z. Zhang, Q. Su, W. Zhao, W. Cheng, D. Li, Z. Yang, R. Bai, F. Xu, Y. Zhang and S. Zhang, Green Chem., 2020, Accepted Manuscript , DOI: 10.1039/D0GC00493F

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