Chin‐Ping Yang, Wen‐Tung Chen
Jun 1, 1993
Citations
0
Influential Citations
26
Citations
Journal
Macromolecular Chemistry and Physics
Abstract
A new polymer-forming diamine, 2,3-bis(4-aminophenoxy)naphthalene, was synthesized in two steps from the condensation of 2,3-naphthalenediol and p-chloronitrobenzene, giving 2,3-bis(4-nitrophenoxy)naphthalene, followed by the reduction with hydrazine/Pd-C system. A series of novel aromatic polyamides (aramids) were synthesized by direct polycondensation of the diamine with various aromatic dicarboxylic acids in N-methyl-2-pyrrolidone (NMP) using triphenyl phosphite and pyridine as condensing agents. These aramids have inherent viscosities of 0,70–1,48 dL/g and were obtained in quantitative yield. The polymers are generally soluble in a wide range of solvents, such as N,N-dimethylacetamide, NMP, dimethyl sulfoxide, pyridine, and tetrahydrofuran, and afford transparent, flexible, and tough films upon casting from their solutions. The glass transition temperatures of these aramids are in the range of 242−267°C, and the 10% weight loss temperatures are above 503°C in nitrogen and above 496°C in air.