Minami Yasunori, Honobe Rena, Tsuyuki Shunsuke, Sato Kazuhiko, Yoshida Masaru
Interdisciplinary Research Center for Catalytic Chemistry (IRC3), National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565, Japan.
PRESTO, Japan Science and Technology Agency (JST), 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565, Japan.
ChemSusChem. 2025 Feb 1;18(3):e202401778. doi: 10.1002/cssc.202401778. Epub 2024 Nov 6.
Super engineering plastics such as polyetheretherketone (PEEK) and polyetherethersulfone (PEES) exhibit thermal stability, chemical resistance, and mechanical strength. Such characteristics are attributed to their robust chemical structures composed of stable aryl ethers. These features make chemical recycling difficult. This is because it is necessary to overcome through the stability of the material and then precisely cleave the stable bonds. This study demonstrates the depolymerization of PEES and PEEK by hydroquinone in the presence of sodium hydroxide in 1,3-dimethyl-2-imidazolidinone (DMI) solvent at 150 °C. This method effectively provides monomeric products, diphenylsulfone and benzophenone having two 4-hydroxyphenoxy groups at both para positions. DMI solvent was the crucial factor for this transformation, since it enhanced the reactivity of hydroquinone to cleave the aryl ether bonds.
聚醚醚酮（PEEK）和聚醚醚砜（PEES）等超级工程塑料具有热稳定性、耐化学性和机械强度。这些特性归因于它们由稳定的芳基醚组成的坚固化学结构。这些特性使得化学回收变得困难。这是因为有必要克服材料的稳定性，然后精确地切断稳定的键。本研究表明，在150 °C下，对苯二酚在氢氧化钠存在下于1,3-二甲基-2-咪唑啉酮（DMI）溶剂中可使PEES和PEEK解聚。该方法有效地提供了单体产物，即对苯二酚在两个对位均具有两个4-羟基苯氧基的二苯砜和二苯甲酮。DMI溶剂是这种转化的关键因素，因为它增强了对苯二酚切断芳基醚键的反应活性。
