Chemical recycling of poly-(bisphenol A carbonate) by diaminolysis: A new carbon-saving synthetic entry into non-isocyanate polyureas (NIPUreas)

The present study describes an unprecedented approach to valorize potentially hazardous poly-(bisphenol A carbonate) (PC) wastes. In THF, under non-severe conditions (120 degrees C), the reaction of PC with long-chain di amines H2NRNH2 (2 equivalents) provided a tool to regenerate the monomer bisphenol A (BPA; 83-95%, isolated) and repurpose waste PC into [-NHRNHCO-](n) polyureas (PUs; 78-99%, isolated) through a non-isocyanate route. Basic diamines (1,6-diaminohexane, 4,7,10-trioxa-1,13-tridecanediamine, meta-xylylenediamine, paraxylylenediamine) reacted with PC without any auxiliary catalyst; less reactive aromatic diamines (4,4'-diaminodiphenylmethane, 2,4-diaminotoluene) required the assistance of a base catalyst (1,8-diazabicyclo[5.4.0] undec-7-ene, NaOH). The formation of [-NHRNHCO-](n) goes through a carbamation step affording BPA and carbamate intermediates H[-OArOC(O)NHRNHC(O)-](n)OArOH (Ar=4,4'-C6H4C(Me)(2)C6H4-) that, in a subsequent step, convert into [-NHRNHCO-]n and more BPA. All the PUs were characterized in the solid state by CP/MAS C-13 NMR (delta(C=O) = 152-161 ppm) and IR spectroscopy. The positions of nu(N-H) and nu(C--O) absorptions are typical of "hydrogen-bonded ordered" bands suggesting the presence of H-bonded groups in network structures characterized by some degree of order or regularity. DSC and TGA analyses showed that the PUs are thermally stable (T-d,T-5%: 212-270 degrees C) and suitable for being processed since their degradation begins at temperatures about 100 degrees C higher than their T-g or T-m.