Abstract
Non-linear pattern formation in polymer systems has been studied. We present the undulation pattern observed on the free surface of a polymer film cast from solution, for poly(styrene- ran-butadiene) random copolymer and for mixtures of polystyrene and dioctylphthalate. The undulation pattern was similar to a hexagonal cellular pattern observed for low viscous fluid produced by Rayleigh-Bénard convection. It was considered that steady-state convective flows occur in a polymer solution with relatively low viscosity, which is induced by solvent evaporation in the earlier stage of casting. Inhomogeneity of the polymer concentration attributed to the convection was considered to play an important role in the pattern formation.
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