Commercially available Bisphenol A (BPA) epoxy resin Epidian 6 (Ciech, Sarzyna, Poland) with a molecular weight of 360 g mol−1 was used. The following chemicals were also used to obtain bis(cyclic carbonate): dimethylacetamide (DMAC), tetrabutylammonium bromide (TBAB) and acetone acquired from Sigma Aldrich (Germany, Poland). Compressed carbon dioxide (in a gas cylinder) was purchased from Messer (Kraków, Poland).
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