Polyoxazolidones prepared from bisurethans and bisepoxides

Linear polymers containing oxazolidone rings in the main chain were prepared from difunctional urethans and epoxides by the synthetic method previously used for reaction of monofunctional urethans and epoxides. The similarity of the infrared spectra of polymers and model compounds, bisoxazolidones, showed the presence of oxazolidone rings in a polymer chain. The solubility and softening temperatures of the polymers varied with the urethan unit but not with the bisepoxide structure. Polymers prepared from p‐phenylenedimethylurethan and variable bisepoxides were insoluble or partially soluble in dimethylformamide, dimethyl sulfoxide, and m‐cresol and had higher softening temperatures. Polymers from m‐phenylenediethylurethan or toluenediethylurethan and bisepoxides were soluble in the organic solvents mentioned above, and had lower softening temperatures.