Dynamics of amphiphilic diblock copolymers at the air-water interface

作者：Stocco Antonio^*; Tauer Klaus; Pispas Stergios; Sigel Reinhard

来源：Journal of Colloid and Interface Science, 2011, 355(1): 172-178.

DOI：10.1016/j.jcis.2010.11.049

• Amphiphilic polymer
• Light scattering
• Ellipsometry
• Diffusion
• Air-water interface

Two polyisoprene-polyethyleneoxide diblock copolymers with different block length ratios adsorbed to the water surface were investigated by multiple angle of incidence ellipsometry, evanescent wave light scattering, and surface tension experiments. In a semidilute interfacial regime, the transition from a two-dimensional to a "mushroom" regime, in which polymer chains form loops and tails in the subphase, was discussed. A diffusion mechanism parallel to the interface was probed by evanescent wave dynamic light scattering. At intermediate concentrations, the interfacial diffusion coefficient D(parallel to) scales with the surface concentration Gamma, as D(parallel to) similar to Gamma(0.77) in agreement with the scaling observed for polymer solutions in a semidilute regime. At relatively high concentrations a decreasing of D(parallel to) is discussed in terms of increasing friction due to interactions between polyisoprene chains.

• 出版日期2011-3-1