Sulfur‐containing polymers, 4. Polymers with thiocarbonate and dithiocarbonate moieties from aliphatic dithiols. Syntheses and characterization

Several polycarbonate analogues with sulfur atoms replacing all or part of the oxygen atoms in the carbonate units of the polymer, were prepared by interfacial synthesis from aliphatic dithiols and phosgene or bisphenol‐A bischloroformate or bisphenol‐A polycarbonate oligomers. That way, polydithiocarbonates (containing SCOS groups) (2a – c), polythiocarbonates (containing OCOS groups) (4a – c) and block copolymers 6a – c (containing OCOO groups, mainly, and OCOS groups randomly distributed along the chain) were prepared. The expected chemical structures were confirmed by 1H NMR, 13C NMR and FT‐IR spectroscopy. Their thermal transitions were investigated by DSC, and the effects of replacing oxygen atoms for sulfur atoms are discussed.