Linear viscoelasticity of concentrated polyethylene glycol tert-octylphenyl ether solutions

Linear viscoelastic studies were carried out on concentrated polyethylene g lycol tert-octylphenyl ether solutions over a range of temperatures and con centrations comprising the lamellar and hexagonal liquid-crystalline phases and the isotropic surfactant-rich phase. The generalized or a simple Maxwe ll model fits the frequency dependence of the dynamic functions for the hex agonal and isotropic surfactant-rich phases, respectively. The combined inf luence of temperature and concentration on both the zero-shear rate-limitin g viscosity and the relaxation time for isotropic samples follows an expone ntial dependence. The results are discussed according to the phase behaviou r of these systems.