K. Choi, J. Jung
Aug 9, 2004
Citations
0
Influential Citations
14
Citations
Journal
Macromolecular Materials and Engineering
Abstract
New aromatic polyamides containing two n-alkylphenylimide units fused to the main chain were prepared by the actived polyamidation of 3,6-di(4-carboxyphenyl)-N,N'-di(4-n-alkylphenyl)pyromellitimides (C m DA, m = 0, 8, 12, 16) with oxy-4,4'-dianiline in a mixture of N-methylpyrrolidone and pyridine (Py) in the presence of triphenyl phophite and CaCl 2 . The imide-containing dicarboxylic acid monomers were synthesized by the imidization of 3,6-di(4-carboxyphenyl)pyromellitic dianhydride with 4-n-alkylanilines. The polymers showed both enhanced thermal stability and excellent solubility due to the presence of thermally stable stable pendent imido groups and internally plasticizing n-alkyl chains. Their glass transition temperatures were between 225 and 285°C and decreased with increasing side chain length. Wide-angle X-ray diffraction investigations revealed that all the polymers are amorphous and have typical layered structures formed by n-alkyl side chains.