Polyurethane sulfides containing cyclohexane ring in the polymer chain

Polyurethane sulfides of high molecular weight containing trans‐1,4‐cyclohexylene groups were successfully obtained by both methods of polymerization, polyaddition of trans‐1,4‐cyclohexylenebis(N,N‐ethyleneurethane) or trans‐hexahydro‐p‐xylylenebis(N,N‐ethyleneurethane) with polymethylene dimercaptans and polycondensation of bis(chloroformates) with polymethylenebis(β‐aminoethyl thioethers) prepared by reaction of ethylenimine with polymethylene dimercaptans. Comparison of physical properties of the polymers prepared by both methods of preparation indicated that (1) polymer repeating units of polyaddition and polycondensation products were quite equivalent; (2) polycondensation polymers had chloroformyl groups as terminal groups.