Electric fields have been shown to stabilize the disordered phase of near-critical block copolymer solutions. Here, we use in situ synchrotron small-angle X-ray scattering to examine how the initial orientation of lamellar domains with respect to the external field (φ) affects the shift in the order-disorder transition temperature () of lyotropic solutions of poly(styrene--isoprene) in toluene. We find a downward shift of the transition temperature, which scales with lamellar orientation as Δ ∼ cos φ, in accordance with theory.
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