2019 Volume 76 Issue 2 Pages 150-156
An isothermally crystallized polyethylene/polystyrene diblock copolymer (PE-b-PS) film exhibited a characteristic melting behavior. In this study, the melting behavior of PE-b-PS isothermally crystallized at different crystallization temperatures (Tc) was investigated. Differential scanning calorimetry (DSC) melting thermograms for PE-b-PS isothermally crystallized at different Tcs were measured, and a deconvolution analysis was performed. The higher-temperature melting peak, of which the temperature was independent of Tc, was attributed to crystals formed during quenching from the molten state to Tc. The lower-temperature melting peak, of which the temperature was dependent on Tc, was attributed to crystals formed at Tc. The broad melting peak observed at lower temperatures was attributed to crystals formed during quenching after the isothermal crystallization process. These results indicated that the deconvolution analysis of DSC profiles is useful for evaluating the constitution of crystalline domains in the bicontinuous crystalline/amorphous structure of isothermally crystallized PE-b-PS.
