Mechanochemical non-catalytic methanolysis of poly(bisphenol a carbonate) Hyo Won Lee 1 , Kwangho Yoo 2 , Lars Borchardt 2* and Jeung Gon Kim 1* 1 Department of Chemistry and Research Institute of Physics and Chemistry, Jeonbuk National University, Republic of Korea, 2 Department of Inorganic Chemistry, Ruhr-Universität Bochum, Germany Chemical recycling of polycarbonate (PC) has been of interest due to potential leaking of environmentally hazardous bisphenol A (BPA). However, depolymerization of PC generally requires high temperature, high pressure, or expensive catalyst. We anticipated that mechanochemistry would mitigate those problems, as seen in many synthetic examples; thus, methanolysis was commenced using mechanical force, ball-milling. While, the model compound, diphenyl carbonate (DPC), was observed to decompose in methanol at high temperature 100 degrees. However, solution-based depolymerization of PC was not amenable due to poor solubility and miscibility. Here, we successfully solved the solubility problem by introducing the ball-milling technique. Planetary ball-milling of PC and methanol produced bisphenol A and dimethyl carbonate in high yield without additives such as base or catalyst, showing another successful story of mechanochemistry. References 1. J. G. Kim, Poly. Chem. ,2020, 11 , 4830-4849. 2. K. Ikenaga, K. Higuchi, S. Kohri and K. Kusakabe, IOP Conf. Ser.: Mater. Sci. Eng. , 2018, 458 , 012037 3. D. Kim,B.-K. Kim,Y. Cho,M. HanandB.-S. Kim, Ind. Eng. Chem. Res. , 2009, 48 , 685-691
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