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Zusammenfassung:
We report on the first high-resolution x-ray measurements of a second-order nematic to (bilayer) smectic-A phase transition in a polymeric liquid crystal, P4.1 polysiloxane. The critical exponents of the parallel and perpendicular correlation lengths and susceptibility were ν∥=0.77±0.05, ν⊥=0.57±0.08, and γ=1.33±0.10, respectively. The bare correlation lengths, ξ0∥q0 and ξ0⊥q0, were 3.27 ± 0.08 and 1.09 ± 0.14, respectively, and are unusually large in comparison to monomeric liquid crystals.