Abstract
Spatial segmental density fluctuations occurring in a polystyrene-polyisoprene diblock copolymer in bulk and in disordered state were investigated by small-angle X-ray scattering. The observed wavelength of the dominant mode of the fluctuations was found to be larger than that predicted by the random phase approximation by a factor up to 50%. This discrepancy was found to be essentially removed by taking into account the distributions of molecular weight and composition of the block copolymer.
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