Recyclable high-strength polybutadiene-based rubber with self-healing and shape memory properties via dynamic boronic ester and Diels-Alder chemistry

Yang, Shengao and Wang, Yan and Wang, Fang and Zhang, Kaiyi and Lv, Xinxin and Teng, Hao and Zheng, Rui and Luo, Faliang and Xing, Qian (2025) Recyclable high-strength polybutadiene-based rubber with self-healing and shape memory properties via dynamic boronic ester and Diels-Alder chemistry. EXPRESS POLYMER LETTERS, 19 (1). pp. 94-106. ISSN 1788-618X

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Abstract

Dynamic cross-linked networks (DCNs) endow thermoset rubber with self-healability and recyclability to extend its lifetime and alleviate environmental pollution. However, the contradiction between high self-healing and mechanical properties in DCNs rubber is always difficult to be resolved. Herein, we used boronic ester (BO) and Diels-Alder dynamic covalent bonds (DA) to synthesize polybutadiene-based dual networks rubber (PB-BO-DA) via thiol-ene reaction. This approach achieved a tensile strength of 16.46 MPa and 99% self-healing efficiency, facilitated by extensive intermolecular interactions (π-π packing and N-B coordination) and fully dynamic cross-linking. In addition, multiple dynamic cross-linked networks (MDCNs) polybutadiene-based rubber also show excellent shape memory ability and recyclability. This strategy might open a helpful pathway to fabricate intelligent multifunctional polymers with high strength and high self-healing efficiency.

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