Synthesis, characterization of polytridecamethylene 2,6-naphthalamide as semiaromatic polyamide containing naphthalene-ring

Abstract

A novel engineering plastic polytridecamethylene 2,6-naphthalamide (PA13N) was prepared via a reaction of 2,6-naphthalene dicarboxylic acid and 1,13-tridecanediamine through a three-step procedure. The structure of synthesized PA13N was characterized by elemental analysis, Fourier transform infrared (FT-IR) spectroscopy and proton nuclear magnetic resonance ( 1 H-NMR). The thermal behaviors were determined by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA). The solubility, water-absorbing capacity, and mechanical properties of PA13N have also been investigated. Melting temperature (Tm), glass transition temperature (Tg) and decomposition temperature (Td) of PA13N are 288, 129 and 492C, respectively. The results show that the heat resistance and mechanical properties of PA13N are near to those of polynonamethylene terephthalamide (PA9T), and PA13N is a promising heat-resistant and processable engineering plastic.