Nematic solutions of nematic side chain polymers : twist viscosity effect in the dilute regime

C. Weill , C. Casagrande , M. Veyssie , H. Finkelmann

We have shown that the twist viscosity of a nematic medium is largely increased when adding polymeric chains, even in a low concentration regime. This effect is analysed in terms of the chain length and the nematic order parameter. The experimental results are in good agreement with a model implying an anisotropic conformation of the polymeric backbone; they allow a numerical determination of the anisotropy, which appears large enough to be directly measured by a small angle scattering technique.

Mots clés: liquid crystal polymers; nematic liquid crystals; viscosity of liquids

Domaines: Articles anciens

C. Weill, C. Casagrande, M. Veyssie, H. Finkelmann. Nematic solutions of nematic side chain polymers : twist viscosity effect in the dilute regime. Journal de Physique, 1986, 47 (5), pp.887-892. ⟨10.1051/jphys:01986004705088700⟩. ⟨jpa-00210272⟩