Olefin metathesis-based chemically recyclable polymers enabled by fused-ring monomers
Olefin metathesis-based chemically recyclable polymers enabled by fused-ring monomers
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DOI：
10.1038/s41557-021-00748-5
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发表时间：
2021-07-22
期刊：
影响因子：
21.8
通讯作者：
Wang, Junpeng
中科院分区：
文献类型：
--
作者：
Sathe, Devavrat;Zhou, Junfeng;Wang, Junpeng
解决塑料可持续性挑战的一个有希望的解决方案是用化学可回收的聚合物取代现有的聚合物，这些聚合物可以分解成其组成单体，从而实现材料的循环使用。尽管取得了一些进展，但很少有可解聚聚合物表现出传统聚合物所需的热稳定性和强机械性能。在这里，我们报告了一系列化学可回收的聚合物，这些聚合物具有优异的热稳定性（分解温度>370摄氏度）和可调的机械性能。该聚合物通过环辛烯与安装在5和6位的反式环丁烷的开环易位聚合形成。额外的环通过降低单体中的环应变能（从未取代环辛烯中的8.2 kcalmol（-1）到稠环中的4.9 kcalmol（-1）），将不可解聚的聚环辛烯转化为可解聚的聚合物。这种稠环单体能够整合广泛的功能，提供化学可回收的弹性体和塑料，有望成为下一代可持续材料。
A promising solution to address the challenges in plastics sustainability is to replace current polymers with chemically recyclable ones that can depolymerize into their constituent monomers to enable the circular use of materials. Despite some progress, few depolymerizable polymers exhibit the desirable thermal stability and strong mechanical properties of traditional polymers. Here we report a series of chemically recyclable polymers that show excellent thermal stability (decomposition temperature >370 degrees C) and tunable mechanical properties. The polymers are formed through ring-opening metathesis polymerization of cyclooctene with a trans-cyclobutane installed at the 5 and 6 positions. The additional ring converts the non-depolymerizable polycyclooctene into a depolymerizable polymer by reducing the ring strain energy in the monomer (from 8.2 kcal mol(-1) in unsubstituted cyclooctene to 4.9 kcal mol(-1) in the fused ring). The fused-ring monomer enables a broad scope of functionalities to be incorporated, providing access to chemically recyclable elastomers and plastics that show promise as next-generation sustainable materials.