“…As is well-known from experiment, − in the presence of selective interfaces for which the energy gain for a monomer in the favored solvent is large, the hydrophobic and polar blocks of a copolymer chain try to stay on different sides of the boundary between the two solvents, leading thus to a major reduction of the interfacial tension which has important technological applications, i.e., for compatilizers, thickeners, or emulsifiers. Not surprisingly, during the past two decades the problem has gained a lot of attention also from theory − as well as from computer experiment. − While in earlier studies attention has been mostly focused on diblock copolymers 6,8 due to their relatively simple structure, the scientific interest shifted later to random HP copolymers at penetrable interfaces. − , In contrast, our investigations have focused mainly on the impact of block size M on the static properties and localization kinetics of regular multiblock copolymers at the phase boundary between the two immiscible solvents. We showed that these are well described by a simple scaling theory 1,3 in terms of the total copolymer length N (the number of repeating units in the chain), the block size M (the number of consecutive monomers of the same kind), and the selectivity parameter χ, that is, the energy gained by a monomer when moving into the more favorable solvent.…”