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- Discotic liquid crystals (1) (entfernen)
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The molecular dynamics of the discotic liquid crystals like pyrene-1,3,6,8-tetracarboxylic tetra(2-ethylhexyl) ester is studied by dielectric relaxation spectroscopy. Dielectric spectroscopy shows 3 processes: a b-relaxation at low temperatures and an a-relaxation in the temperature range of the mesophases followed by conductivity. The dielectric a-relaxation is assigned to a restricted glassy dynamics in the plastic crystal as well as in the liquid crystalline phase.