Abstract
The morphologies of the microdomain structures in polystyrene-polyisoprene (PS-PI) diblock copolymer and polyisoprene (PI) homopolymer blends were investigated by small-angle X-ray scattering. The PS-PI investigated in the present study has number-average molecular weight and volume fraction of PI , and PI has . The weight fraction of added homopolymer was 0.17. We demonstrated that the existence of ordered-bicontinuous-double-diamond (OBDD) structure was explicitly identified in the PS-PI/PI blend by the scattering method. It was confirmed that OBDD microdomain changed to gyroid (Gyr) when the sample was heated, and the order-order transition between OBDD and Gyr thermo-reversibly occurred. The kinetics of the transformation between OBDD and Gyr was also investigated. In this study, the intermediate structure during the transition between OBDD and Gyr was not observed. A comparison between the rates of transformation revealed that the rate of the OBDD to Gyr transformation is faster than that of the Gyr to OBDD.
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