Abstract
Some diesters and diurethanes were prepared by the reactions of N-carbethoxy-ε-aminocaproyl chloride, 5-carbethoxypentylisocyanate, or N-carbethoxy-6-aminohexylisocyanate with ethyl ε-aminocaproate, ethyl ε-oxycaproate, N-carbethoxyhexamethylenediamine, or N-carbethoxy-ε-aminohexanol. They contain one amide, urea, or urethane group in polymethylene linkage between two terminal ester or urethane groups. Syntheses of polymers having the regular structure of-A-A-B- type were attempted by the polycondensation reactions between the compounds described above and aliphatic diamines, diols, or dicarboxylic acids of 6 or 9 carbon atoms. Among them polyamide-ureas showed a good fiber-forming property.
