Study the effect of molecular weight, viscosity and temperature on relaxation times for the liquid crystal material ch3oc6h4ch:nc6h4(ch2)‎3ch3

الملخص EN

The research aim is the study of the effect of the molecular weight, viscosity and temperature on the relaxation times for liquid crystal material (p-Methoxybenzylidene-p-Butylaniline) (MBBA) CH3OC6H4CH : NC6H4 (CH2)3 CH3 the liquid crystal material-Schiff bases-(MBBA) has been selected as a sample of study since if shows nematic behavior at room temperature in addition to being are of the major compounds that shows the effect of following dynamic scattering mode.

Four samples and its ions of metallic complexes (Cu+2, Ni+2, Co+2, Cr+3) of different molecular weights had been used.

The logarithmic of molecular weights for five samples are calculated and study the dynamic electro-optic properties, measurements are performed at wavelength (632.8nm).

It has been found that the relaxation times (τN) are depends on the heating temperature, and functions of viscosity.

The voltage needed to produce complete orientation in the molecules of the liquid crystals material and four complexes, are found that the increased by the increases of the molecular weight.