Effect of molecular structure of imidazolium-based ionic liquid on depolymerization efficiency of polycarbonate
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초록
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Depolymerization using ionic liquids (ILs) is an efficient and eco-friendly method for recycling waste poly(bisphenol A carbonate) (PC). In this study, structural effect of imidazolium-based ILs on ethanolysis of PC was monitored. Imidazolium-based ILs with different alkyl chain lengths (ethyl, butyl, and hexyl groups), and different isomer structures were used as both the catalyst and solvent for the ethanolysis of PC. Conductor-like screening model for real solvents (COSMO-RS) calculation was also conducted to understand the reason of different depolymerization efficiency depending on the molecular structure of imidazolium-based ILs. As a result, hydrogen bonding energy and enthalpy of mixing between ILs and polycarbonate was known as an important variable to determine the depolymerization efficiency of PC, and eventually a 100% PC conversion rate and 90.9% Bisphenol-A (BPA) yield were confirmed using optimized IL structures.