Abstract: The rheological behavior of a lamellar lyotropic liquid crystal formed from nonyl phenol ethoxylate(10)(NP-10)/water was investigated using a rheometer. The influence of composition and temperature on the dynamic function was studied at varied surfactant concentration and temperature. The frequency-dependent storage and loss modulus were found not to be consistent with the Maxwell model in the linear viscoelastic region. The results were analyzed on the basis of slip-plane theory. The compliance was also measured, and the instantaneous elasticity measured in the creep tests was in according with the oscillatory tests. Burgers model was used to describe the time-dependent compliance.

Key words: nonyl phenol ethoxylate(10), Lamellar liquid crystal, rheology, slippage, creep-recovery