The structure and morphology of a novel polyamide, nylon-10,14, and its lamellar crystals from dilute solution were examined by transmission electron microscopy and wide-angle X-ray diffraction (WAXD). Both the electron-diffraction pattern and WAXD data demonstrated that nylon-10,14 adopts the structure of a triclinic lattice similar to that of the traditional nylon-66 but with a corresponding increase of the c parameter to 3.23 nm. In addition, the thermal behavior of melt-crystallized nylon-10,14 was investigated by dynamic mechanical analysis (DMA) and differential scanning calorimetry (DSC). The glass-transition temperature of nylon-10,14 determined by the DMA data was 46.6 degreesC. DSC indicated that the multiple melting behavior of isothermally crystallized nylon-10,14 probably results from the melt and recrystallization mechanism. (C) 2003 Wiley Periodicals, Inc.