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Updated: May 12, 2025

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

Published on: December 16, 2022

Modular Access to Aliphatic Polycarbonates with Tunable Properties and Dual Closed-Loop Recyclability by

Wei-Ning Liu¹, Mingqian Wang¹, Zhiqiang Ding¹

¹Tianjin Key Laboratory of Composite & Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin, 300350, China.

Angewandte Chemie (International Ed. in English)

|April 28, 2025

Summary

A novel "polycondensation-depolymerization-repolymerization" strategy enables efficient synthesis of high-molecular-weight aliphatic polycarbonates. This method allows for tunable properties and dual closed-loop chemical recycling under mild conditions.

Keywords:

Aliphatic polycarbonates Closed‐loop recyclability Cyclic carbonates Ring‐opening polymerization Thermoplastic elastomers

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Published on: November 21, 2017

Area of Science:

Polymer Chemistry
Materials Science

Background:

Efficient synthesis of high-molecular-weight (>100 kDa) aliphatic polycarbonates with tunable properties and recyclability remains a challenge.
Existing methods like CO2/epoxide copolymerization and dialkyl carbonate/diol polycondensation have limitations.

Purpose of the Study:

To develop a versatile strategy for preparing structurally diverse, high-molecular-weight aliphatic polycarbonates.
To achieve tunable thermal and mechanical properties and enable efficient chemical recycling.

Main Methods:

A three-step "polycondensation-depolymerization-repolymerization" approach was employed.
Low-molecular-weight polycarbonates were synthesized via step-growth polycondensation.
Catalytic depolymerization yielded cyclic carbonate monomers for ring-opening polymerization to high molecular weights (>100 kDa).

Main Results:

The strategy successfully produced high-molecular-weight aliphatic polycarbonates (>100 kDa).
Tunable thermal and mechanical properties were achieved by varying substituents, with a spiro-cyclic polycarbonate showing a high melting point (217 °C).
Dual closed-loop chemical recycling was demonstrated via ring-closing depolymerization or alcoholysis.
Triblock thermoplastic elastomers with excellent performance were synthesized.

Conclusions:

The "polycondensation-depolymerization-repolymerization" strategy offers a powerful method for creating advanced aliphatic polycarbonates.
This approach addresses the need for high-performance, recyclable polymers under mild conditions.
The developed polycarbonates exhibit promising properties for various applications.