A novel phosphatidylcholine analogous vinyl monomer 1-(acrylamidomethyl)-2’-(trimethyl ammonio)ethyl phosphate (AMP) was synthesized and characterized. A series of amphiphilic poly(acrylamide)s were obtained from AMP, and some dialkylacrylamide monomers, by radical copolymerization in the presence of alpha,alpha’-azobis(isobutyronitrile) (AIBN). The polyelectrolyte behavior of these copolymers was investigated by their viscosity measurements. Moreover, the structures in condensed phases and thermal properties of these copolymers were investigated by X-ray analysis, DSC measurement, and POM observation. In addition, the phase transitions of monolayers obtained from these amphiphilic copolymers were observed by changing the temperature of the subphase, length of the alkyl chains, and observation times (t(ob)). The LB films were prepared by using the vertical dipping method, and their surface contact angles with pure water were also measured.