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The phase behaviors of block copolymer (BCP) blends composed of the weakly interacting (with no specific interaction) polystyrene-b-poly(n-butyl methacrylate) (PS-b-PnBMA) and polystyrene-b-poly-(n-hexyl methacrylate) (PS-b-PnHMA) were studied,using small-angle neutron scattering (SANS),small-angle X-ray scattering (SAXS),and depolarized light scattering (DPLS).