초록
We have successfully synthesized new aromatic polyamide having pendant amide group, i.e., aromatic poly(2,5-diaminobenzamide-terephthalamide) (PDB TA) and poly(diamino-carbamoylbenzanilide-terephthalamide) (poly(DACB-TPC)) by the low temperature solution polymerization of terephthaloyl chloride with aromatic amide diamines of 2,5-diamino-benzamide, 4,4'-diamino-6-carbamoylbenzanilide and 3,4'-diamino-6-carbamoylbenzan ilide . The changes of chemical structure along a polymer chain during thermal and chemical treatment were examined by FT-FR spectroscopy. The thermal cyclization of poly(2,5-dimino be n am ids-terephthalamide) (PDB TA) and poly(4,4'-diamino-6-carbamoylbenz anilide- terephthalamide) (poly(p-DAC B-TPC ) in the absence and in the presence of catalyst such as LiCl produces both quinazolone and benzoxazinone rings by dehydration and deamination respectively through condensation reaction of pendant carbamoyl group and amide. bond along a polymer chain. The chemical cyclization of PDBTA and polyp-DACB-TPC) in fuming H2SO4, on the contrary, produces nitril groups exclusively along a polymer chain via strong dehydration reaction of pendant carbamoyl group itself in fuming H2SO4.
