Abstract
The order−disorder transition (ODT), microdomain morphology, and phase behavior in mixtures of polystyrene-block-polyisoprene (SI) diblock blended with homopolystyrene (HPS) were investigated. SI with a total molecular weight of 2.0 × 104 and volume fraction of polystyrene (PS) of 0.51 (designated SI-11/9) was blended with a homopolystyrene of molecular weight 6.1 × 103 (designated S-6). Binary mixtures of diblock copolymer and homopolymer were prepared by solvent casting. The ODT was quantitatively identified using the discontinuity observed in a plot of the reciprocal of the peak small-angle X-ray scattering (SAXS) intensity, Im-1, as a function of the reciprocal of the absolute temperature, 1/T, except for the mixtures showing the disordered sphere morphology for which we determined the temperature of the demicellization/micellization transition (DMT) instead of the ODT by the disappearance of the form factor peak with increasing temperature. We systematically measured the ODT or DMT temperature as a f...
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