A simple, high yield synthesis of 2,5-diaminoterephthalamide (DATA) from 2,5-dicarbomethoxy-l,4- cyclohexanedione (succinoyl succinate) in two steps was developed: amination with ammonium acetate followed by aromatization in the same pot; the enamino ester was ammonolysed in a second step with excess NH 3. Direct polycondensation plus cyclization of DATA with terephthalic acid in strong acid gave much better results than polycondensation of DATA with terephthaloyl dichloride in N-methyl pyrrolidone/CaC12 followed by cyclization in dehydrating strong acid. The polymer showed a disappointingly low solubility. The high viscosity and unfavourable viscoelastic behaviour at low concentration hindered satisfactory spinning and only disappointing fibres were collected. Higher concentrations -- that should have furnished nematic solutions with low viscosity and favourable viscoelasticity -- could not be reached in the solvent systems studied
Посилання на статтю:
rod polymer from 2,5- diaminoterephthalamide (DATA) and terephthalic acid; facile synthesis of DATA / Doetze J. Sikemma* and Dirk B. van Guldener // Polymer. – 1993. – Vol 34. – P. 4373-4376.