スチレン系熱可塑性エラストマ-/非選択溶媒系のキャスト法成膜における溶媒蒸発速度の影響

概要

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Polystyrene-polybutadiene-polystyrene triblock copolymer (SBS) was dissolved in toluene which is a good solvent for both segments. The solution was subject to film formation in an instrument which enabled us to controll the conditions during the polymer film formation. The SBS films obtained under different evaporation rate of solvent were subjected to differential scanninq calorimetry (DSC), dynamic mechanical analysis (DMA) and transmission electron microscopy (TEM). DSC results failed to detect the difference between the samples from different evaporation rate. However, DMA showed systematic-changes in glass-transition temperatures of the soft segment and the hard segment accoding the rate of toluene evaporation. From TEM photographs the change of morphology from lamella to sphere was observed. The lamella showed bicontinuous structure, i. e., both polystyrene and polybutadiene formed continuous phases. This morphological change was estimated to be determined by the rate of solvent evaporation up to the critical concentration of SBS in toluene.
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