A copolymer of acrylamide (AM) and 4-vinylpyridine (4VP) (POLY(AM-CO-4VP)) was synthesized by radical adiabatic copolymerization in aqueous solution. The synthesized copolymer was identified by ¹H NMR, ¹³C NMR, UV-visible spectra and conductimetry. The molecular weights are obtained by GPC and viscosity.  The conductimetry measurement showed that the copolymerisation methods caused a hydrolysed acrylamide function. On the order hand the variation of the surface tension of aqueous copolymer solutions with copolymer concentration revealed a surfactant behavior of the copolymer. The obtained result was compared to that of surfactant model N-dodecyl-pyridinium chloride (DPC). This surfactant behavior of the copolymer according to the neutralization degree α was also investigated by surface tension measurements.