• polyamides;
  • synthesis;
  • polycondensation;
  • thermal properties;
  • mechanical properties


A novel engineering plastic polyundecamethylene 2,6-naphthalamide (PA11N) was prepared via a reaction of 2,6-naphthalene dicarboxylic acid and 1,11-undecanediamine through a three-step procedure. The structure of synthesized PA11N was characterized by elemental analysis, Fourier transform infrared spectroscopy, and proton nuclear magnetic resonance (1H-NMR). The thermal behaviors were determined by differential scanning calorimetry, thermogravimetric analysis, and dynamic mechanical analysis. The solubility, water-absorbing capacity, and mechanical properties of PA11N have also been investigated. Melting temperature (Tm), glass transition temperature (Tg), and decomposition temperature (Td) of PA11N are 294, 139, and 493°C, respectively. The results show that the heat resistance and mechanical properties of PA11N are near to those of polynonamethylene terephthalamide, and PA11N is a promising heat-resistant and processable engineering plastic. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010