Reversible Crosslinking of Commodity Polymers via Photocontrolled Metal–Ligand Coordination for High-Performance and Recyclable Thermoset Plastics,Advanced Materials

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Reversible Crosslinking of Commodity Polymers via Photocontrolled Metal–Ligand Coordination for High-Performance and Recyclable Thermoset Plastics
Advanced Materials ( IF 27.4 ) Pub Date : 2023-07-03 , DOI: 10.1002/adma.202305517
Yun-Shuai Huang ₁ , Yang Zhou ₁ , Xiaolong Zeng ₂ , Dachuan Zhang ₁ , Si Wu ₁

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Thermoset plastics, highly desired for their stability, durability, and chemical resistance, are currently consumed in over 60 million tons annually across the globe, but they are difficult to recycle due to their crosslinked structures. The development of recyclable thermoset plastics is an important but challenging task. In this work, recyclable thermoset plastics are prepared by crosslinking a commodity polymer, polyacrylonitrile (PAN), with a small percentage of a Ru complex via nitrile–Ru coordination. PAN is obtained from industry and the Ru complex is synthesized in one step, which enables the production of recyclable thermoset plastics in an efficient way. In addition, the thermoset plastics exhibit impressive mechanical performance, boasting a Young's modulus of 6.3 GPa and a tensile strength of 109.8 MPa. Moreover, they can be de-crosslinked when exposed to both light and a solvent and can then be re-crosslinked upon heating. This reversible crosslinking mechanism enables the recycling of thermosets from a mixture of plastic waste. The preparation of recyclable thermosets from other commodity polymers such as poly(styrene-coacrylonitrile) (SAN) resins and polymer composites through reversible crosslinking is also demonstrated. This study shows that reversible crosslinking via metal–ligand coordination is a new strategy for designing recyclable thermosets using commodity polymers.

中文翻译：

通过光控金属配体配位实现商品聚合物的可逆交联，以获得高性能和可回收的热固性塑料

热固性塑料因其稳定性、耐用性和耐化学性而备受青睐，目前全球每年消耗超过 6000 万吨，但由于其交联结构而难以回收。可回收热固性塑料的开发是一项重要但具有挑战性的任务。在这项工作中，可回收的热固性塑料是通过将商品聚合物聚丙烯腈 (PAN) 与少量的 Ru 络合物通过腈-Ru 配位进行交联来制备的。PAN是从工业中获得的，Ru络合物是一步合成的，这使得能够以一种有效的方式生产可回收的热固性塑料。此外，热固性塑料还表现出令人印象深刻的机械性能，杨氏模量为 6.3 GPa，拉伸强度为 109.8 MPa。此外，当暴露于光和溶剂时它们可以去交联，然后可以在加热时重新交联。这种可逆交联机制使得能够从塑料废物混合物中回收热固性材料。还演示了通过可逆交联从其他商品聚合物（例如苯乙烯-丙烯腈）（SAN）树脂和聚合物复合材料制备可回收热固性材料。这项研究表明，通过金属-配体配位进行可逆交联是使用商品聚合物设计可回收热固性材料的新策略。

更新日期：2023-07-03

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