期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 29, 页码 33305-33314出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c09712
关键词
vitrimer; N-coordinated boroxine; recyclability; shape memory; high-strength
资金
- National Natural Science Foundation of China [51873203]
- Key Projects of Jilin Province Science and Technology Development Plan [20180201087GX]
- Jilin Province [2019SYHZ0003]
- Chinese Academy of Sciences [2019SYHZ0003]
Vitrimers endow cross-linked polymers with malle-ability and reprocessability via exchange reactions. However, designing of reprocessable, shape-memory polymer materials with high strength via a catalyst-free method remains a challenge under mild conditions. Here, we propose a facile strategy to address this dilemma by introducing the exchangeable imine bond and N-coordinated boroxine into a polybutadiene (PB)-based network. Specifically, PB grafted with 2-aminoethanethiol is reacted with the formyl group of phenylboronic acid and dehydrated to form a dual-dynamic covalently cross-linked network at room temperature. The dynamic network draws on the advantage of imine (toughness) and N-coordinated boroxine (strength), making the PB-based materials exhibit favorable malleability, mechanical property, reprocessability, and thermal-induced shape-memory behavior. We can obtain customized high mechanical properties by tuning the cross-linking density, and the tensile strength reaches a high value (12.35 MPa) without fillers or any other additives. Meanwhile, the unique network framework makes the material recycle over several times without sacrificing its property. This work presents a facile and effective approach to achieve a multifunctional polymer with customized attributes. Besides, this strategy can recycle end-of-life rubber to alleviate environmental pollution and provide inspiration for fabricating targeted materials by uniting the dynamic covalent or noncovalent bonds.
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