The complex dynamic surface elasticity of the solutions of copolymer of sodium 2-acrylamido-2-methyl-l-propansulfonate with N-isopropyl-acrylamide and dodecyltrimethylammonium bromide was measured as a function of the surfactant concentration and the surface age by the oscillating bubble and drop methods. The kinetic dependencies of the surface elasticity proved to be non-monotonic at low concentrations and the main features of the surface viscoelasticity differed from the results for other polyelectrolyte/surfactant solutions films studied so far. The observed peculiarities were connected with the properties of the copolymer chain. (c) 2006 Elsevier Inc. All rights reserved.