Abstract
Several unsymmetrical compounds having two of amino, hydroxy, ester and urethane groups at both ends of polymethylene or p-phenylene group were synthesized. By the polycondensation reactions between these compounds and symmetrical or unsymmetrical compounds, linear polymers containing any two groups of amide, ester, urea and urethane linkages were prepared. Among every combination, some polyamide-ureas from N-carbethoxyhexamethylenediamine and ethyl-ε-aminocaproate, or N-carbethoxy-ε-aminocaproic acid and hexamethylenediamine, and polyurea-urethanes from N-carbethoxy-hexamethylenediamine and N-carbethoxy-6-amino-hexanol, or 6-aminohexanol and hexamethylenediurethane have good fiber-forming property.
