New Aromatic Polyamides from Thianthrene Dicarboxylic Acids and AromaticDiamines. (Reannouncement with New Availability Information)

摘要

Thianthrene-2,7- and -2,8-dicarboxylic acids plus their synthetic intermediate,4,4-thiobis-(3-chlorobenzoic acid), have been synthesized in good yields via nucleophilic aromatic substitution of Na2S on 3,4-dichlorobenzoic acid derivatives. New aromatic polyamides having inherent viscosities of 1.51 to 2.46 dL/g were prepared by the direct polycondensation reaction of the dicarboxylic acids with 4,4'-oxydianiline and 1,4-phenylenediamine in N-methyl-2-pyrrolidone using triphenyl phosphite and pyridine. Polymer analysis by 13 C NMR, FTIR, DSC and TGA confirmed polymer structures and indicated good thermal stabilities.