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A renormalized one-loop theory (ROL) is used to calculate corrections to therandom phase approximation (RPA) for the structure factor $\Sc(q)$ indisordered diblock copolymer melts. Predictions are given for the peakintensity $S(q^{\star})$, peak position $q^{\star}$, and single-chainstatistics for symmetric and asymmetric copolymers as functions of $\chi N$,where $\chi$ is the Flory-Huggins interaction parameter and $N$ is the degreeof polymerization. The ROL and Fredrickson-Helfand (FH) theories are found toyield asymptotically equivalent results for the dependence of the peakintensity $S(q^{\star})$ upon $\chi N$ for symmetric diblock copolymers in thelimit of strong scattering, or large $\chi N$, but yield qualitativelydifferent predictions for symmetric copolymers far from the ODT and forasymmetric copolymers. The ROL theory predicts a suppression of $S(q^\star)$and a decrease of $q^{\star}$ for large values of $\chi N$, relative to the RPApredictions, but an enhancement of $S(q^{\star})$ and an increase in$q^{\star}$ for small $\chi N$ ($\chi N < 5$). By separating intra- andinter-molecular contributions to $S^{-1}(q)$, we show that the decrease in$q^{\star}$ near the ODT is caused by the $q$ dependence of the intermoleculardirect correlation function, and is unrelated to any change in single-chainstatistics, but that the increase in $q^{\star}$ at small values of $\chi N$ isa result of non-Gaussian single-chain statistics.

Renormalized One-loop Theory of Correlations in Disordered Diblock Copolymers