New imide-aryl ether copolymers containing a 1,2,4-triazole heterocyclic unit were prepared, and their structural, mechanical and thermal properties were studied. These copolymers contain an aryl ether 1,2,4-triazole linkage, which was incorporated into a semi-rigid backbone by the reaction of new 1,2,4-triazole diamines with 4,4'-oxydianiline (ODA) and pyromellitic dianhydride (PMDA). The 1,2,4-triazole diamines were prepared through a nucleophilic aromatic substitution reaction of 3,5-bis(4'-fluorophenyl)-4-phenyl- 1,2,4-triazole with either 3- or 4-aminophenol in the presence of K2CO3 in a polar aprotic solvent mixture to afford 3,5-bis(3'-aminophenoxyphenyl)-4-phenyl-l,2,4-triazole and 3,5-bis(4'-aminophenoxyphenyl)-4- phenyl-l,2,4-triazole, respectively. The monomers were reacted with PMDA or co-reacted with ODA and PMDA to synthesize the desired poly(amic acid)s. Films were cast and cured at 350°C to effect imidization, producing films with good mechanical properties.
Посилання на статтю:
Synthesis and properties of imide-aryl ether 1,2,4-triazole random copolymers* / K. R. Cartert, R. D. Miller and J. L. Hedrick // Polymer. – 1993. – Vol 34. – P. 843-848.