Abstract:

Polyolefins constitute over half of global plastic production, and their disposal has led to severe "white pollution" and microplastic issues. Researching the chemical recycling of polyolefin wastes to achieve resource recovery and upcycling is of significant importance. However, as typical carbon-chain polymers, the cracking of polyolefins involves high temperatures, substantial energy consumption, uncontrollable chain scission, product separation challenges, high decontamination costs and low value, making large-scale engineering difficult. It reviewed the innovative advancements in the field of polyolefin oxidative cracking recycling and circular utilization. The outlook included new upcycling processes, specifically the preparation of functionalized oligomers through low-temperature controlled cracking of polyolefin wastes. By employing dynamic chemistry to extend chain lengths of multi-phase and multi-component macromolecular monomers, the aim was to customize polyolefin-like materials. This approach aimed to transform waste polymers into high-value polymers. Furthermore, it emphasized the importance of developing new and sustainable technologies to address plastic pollution and to advance the polyolefin industry. The proposed strategies for the upcycling and recycling of polyolefins held significant scientific and practical value in promoting a sustainable plastics economy.

Key words: polyolefin wastes, upcycling, oxidative cracking, dynamic chemistry, polyolefin-like materials

摘要：

聚烯烃占全球塑料产量一半以上，废弃后带来了严重的“白色”污染和“微塑料”问题。研究废弃聚烯烃的化学回收，实现其资源化和升级利用，具有重要意义。然而，作为典型的碳链高分子，聚烯烃裂解存在温度高、能耗大、断链不可控、产物分离难度大、除杂成本高、价值低等问题，工程放大困难。本文回顾了聚烯烃氧化裂解回收和循环利用领域的创新进展，展望了新的升级回收工艺，即采用废弃聚烯烃低温可控裂解制备官能化低聚物，结合动态化学对多相多组分大分子单体扩链，定制类聚烯烃材料，实现由废弃聚合物到再生聚合物的资源化利用。最后，强调解决塑料污染问题以及聚烯烃产业需要可持续发展的新技术路径，对废弃聚烯烃的升级循环利用具有十分重要的科学意义和应用价值。

关键词: 废弃聚烯烃, 升级回收, 氧化裂解, 动态化学, 类聚烯烃材料