ランダム位相近似によるスチレン系熱可塑性エラストマ-の成膜実験結果の解釈

概要

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By means of the so-called Random Phase Approximation, we gave explanation of the experimental results on the effect of solvent evaporation rate upon the morphology of polystyrene-polybutadiene-polystyrene triblock copolymer (SBS). Formation of microphase separated structure during the solvent evaporation from SBS/toluene solution was estimated using the method. That is, taking the change of volume fraction of polymer under a constant evaporation rate into account, scattering intensity was calculated as a function of time. The result suggests that the volume fraction at which order-disorder transition occurs is about 80%. The solvent evaporation rate which was determined by experiments is equivalent to a dimensionless step in the calculation. The large or high evaporation rate means a wide or large step. The order-disorder transition was reached in the state of homogeneous single phase where the concentration fluctuation did not propagate, which can be a probable reason for the formation of not so clear microphase separation (bicontinuous structure).