Aliphatic polyamide (PA) bearing fluorinated groups was synthesized in bulk withperfluorobutyryl-substituted a-amino-e-caprolactam and e-caprolactam by anionic ringopeningpolymerization (AROP). The fluorinated monomer was obtained by condensationbetween cyclic lysine (i.e. a-amino-e-caprolactam) and perfluorobutyryl chloride. Theeffect of the fluorinated monomer fraction onto the AROP of e-caprolactam was monitoredby the exothermicity of this polymerization versus time. The properties and characteristicsof the resulting polymers were studied by with differential scanning calorimetry,thermogravimetry, magic angle spinning NMR, FT-IR, and contact angle measurements.Polyamides bearing fluorinated groups exhibited better thermal stability than polyamide6 (PA6) as well as a higher hydrophobic surface character as evidenced by surface tensionmeasurements. The glass transition temperature of polyamide 6 was 53 C and rose to58 C for a PA bearing fluorinated moieties, while fluorinated monomer insertion induceda decrease of the melting points from 216 to 198 C. These copolymers displayed amaximum degradation temperature of 390 C as compared to the 310 C for PA6, and theirsurface energies decreased from 49.4 mN cm1 (PA6 value) to 44.1 mN cm1< Leer menos