Properties, characterization and preparation of halogenated aromatic polyamides

This paper describes certain wholly aromatic polyamides based on 1,3-diamino-4-halobenzenes and 1,3-diamino-4,6-dihalobenzenes, and on isophthaloyl and terephthaloyl chloride by means of low temperature solution polymerization. We set out to study the influence of the kind of halogen (F, Cl or Br) and the type of substitution (mono or di) in the diamine moiety with regard to solubility, water uptake and thermal and mechanical properties. The materials are characterized with respect to chemical structure and purity by elemental analysis, infrared (FT-IR) and nuclear magnetic resonance (NMR) spectroscopic techniques, and special attention is paid to the sequence distribution (constitutional order) of polymers derived from non-symmetric monohalogen-substituted diamines, and their influence on the above-mentioned properties.