Rheological and small-angle X-ray scattering (SAXS) measurements were conducted on a symmetric, low molar mass ( = 17.6 kg/mol), poly(-butylstyrene--methyl methacrylate) (PtBS-PMMA) diblock copolymer near the order-disorder transition temperature ( = 193 ± 1 °C). Evidence of composition fluctuations is apparent in the low frequency elastic (G') and loss (G″) moduli and in the temperature dependence of the peak scattering intensity, (*), up to 50 °C above the . These findings demonstrate that chain entanglements are not responsible for the well-documented fluctuation mode in the terminal viscoelastic regime of block copolymer melts.
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