Effects of state change of liquid crystalline polymer on dynamic visco-elasticity of its blends with polyethylene-terephthalate

Abstract

The dynamic viscoelastic properties of liquid crystalline polymer (LCP) and polyethylene terephthalate (PET) blends were studied at two different temperatures: 265 degrees C at which LCP was in solid state and 285 degrees C at which LCP was in molten state. The PET was in molten state at both the temperatures. The storage modulus, G ', loss modulus, G '', dynamic viscosity, eta ', of blends with different compositions were evaluated and compared. The morphology of these samples was studied using scanning electron microscope, which exhibited composition dependency. A maxima was observed in the viscosity versus composition plot corresponding to 90/10 LCP/PET blend at 285 degrees C. The G ' versus G '' plots demonstrated the composition dependency of LCP/PET blends.