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From Polyester Plastics to Diverse Monomers via Low‐Energy Upcycling
Advanced Science ( IF 15.1 ) Pub Date : 2024-04-16 , DOI: 10.1002/advs.202403002
Lei Ji 1 , Jiaolong Meng 1 , Chengliang Li 1 , Ming Wang 1 , Xuefeng Jiang 1, 2
Affiliation  

Polyester plastics, constituting over 10% of the total plastic production, are widely used in packaging, fiber, single‐use beverage bottles, etc. However, their current depolymerization processes face challenges such as non‐broad spectrum recyclability, lack of diversified high‐value‐added depolymerization products, and crucially high energy consumption. Herein, an efficient strategy is developed for dismantling the compact structure of polyester plastics to achieve diverse monomer recovery. Polyester plastics undergo swelling and decrystallization with a low depolymerization energy barrier via synergistic effects of polyfluorine/hydrogen bonding, which is further demonstrated via density functional theory calculations. The swelling process is elucidated through scanning electron microscopy analysis. Obvious destruction of the crystalline region is demonstrated through X‐ray crystal diffractometry curves. PET undergoes different aminolysis efficiently, yielding nine corresponding high‐value‐added monomers via low‐energy upcycling. Furthermore, four types of polyester plastics and five types of blended polyester plastics are closed‐loop recycled, affording diverse monomers with exceeding 90% yields. Kilogram‐scale depolymerization of real polyethylene terephthalate (PET) waste plastics is successfully achieved with a 96% yield.

中文翻译:

通过低能耗升级改造从聚酯塑料到多种单体

聚酯塑料占塑料总产量的10%以上,广泛应用于包装、纤维、一次性饮料瓶等领域。然而,其目前的解聚工艺面临着非广谱回收性、缺乏多样化高附加值等挑战。解聚产物附加值高,能耗高。本文开发了一种有效的策略来拆除聚酯塑料的致密结构,以实现多样化的单体回收。聚酯塑料通过多氟/氢键的协同效应以低解聚能垒发生溶胀和非结晶,这通过密度泛函理论计算得到进一步证明。通过扫描电子显微镜分析阐明溶胀过程。 X射线晶体衍射曲线证明了晶体区域的明显破坏。 PET有效地经历不同的氨解,通过低能耗升级回收产生九种相应的高附加值单体。此外,四种聚酯塑料和五种共混聚酯塑料进行闭环回收,提供多种单体,收率超过90%。成功实现了真正的聚对苯二甲酸乙二醇酯(PET)废塑料的公斤级解聚,收率达到96%。
更新日期:2024-04-16
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