Abstract: The dispersion of nylon 6 (PA6) and ε-polylysine (ε-PL) solution was achieved by controlling the solubility of PA6 and ε-PL in trifluoroethanol and water, the concentration of trifluoroethanol and the mixing order, and then PA6 series composites with different ε-PL content were prepared by rotary evaporation and vacuum drying. The thermal properties of commercial PA6, ε-PL and a series of samples were investigated by thermal gravimetric analyzer and differential scanning calorimeter. The results showed that commercial PA6 was purified and recrystallized by solvent treatment, and the crystallization temperature of PA6 was increased by 9℃, and the melting point was increased by 7 ℃. The addition of ε-PL affected the regularity of PA6, so that the melting point and crystallization temperature of PA6 decreased slightly, but the decrease was less than 3℃, which did not affect its processing performance.

Key words: nylon 6, ε-polylysine, composite material, thermal property