Volume 63, Issue 24 e202401682
Communication

Achieving Exceptional Thermal and Hydrolytic Resistance in Chemically Circular Polyesters via In-Chain 1,3-Cyclobutane Rings

Chaoqun Weng

Chaoqun Weng

Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Center for Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871 China

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Zhiqiang Ding

Zhiqiang Ding

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

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Weijie Qiu

Weijie Qiu

Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Center for Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871 China

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Prof. Dr. Bin Wang

Prof. Dr. Bin Wang

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

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Prof. Dr. Xiaoyan Tang

Corresponding Author

Prof. Dr. Xiaoyan Tang

Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Center for Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871 China

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First published: 08 April 2024
Citations: 19

Graphical Abstract

Polyesters P(4R-BL) (R=Ph, Bu), with 1,3-cyclobutane rings in the backbone, have been developed to demonstrate exceptional thermal stability (Td,5%=376–380 °C) and resistance to hydrolysis (intact in pH 0–14). Distinguished from classic polyesters, they exhibit good chemical circularity and offer adjustable material performances comparable to those of non-degradable syndiotactic polystyrene and low-density polyethylene.

Abstract

Polyesters, a highly promising class of circular polymers for achieving a closed-loop sustainable plastic economy, inherently exhibit material stability defects, especially in thermal and hydrolytic instability. Here, we introduce a class of polyesters, P(4R-BL) (R=Ph, Bu), featuring conformationally rigid 1,3-cyclobutane rings in the backbone. These polyesters not only exhibit superior thermostability (Td,5%=376–380 °C) but also demonstrate exceptional hydrolytic resistance with good integrity even after 1 year in basic and acidic aqueous solutions, distinguishing themselves from typical counterparts. Tailoring the flexibility of the side group R enables the controlled thermal and mechanical performance of P(4Ph-BL) and P(4Bu-BL) to rival durable syndiotactic polystyrene (SPS) and low-density polyethylene (LDPE), respectively. Significantly, despite their high stability, both polyesters can be effectively depolymerized into pristine monomers, establishing a circular life cycle.

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