Dielectric spectroscopy,at room temperature(20℃),is used to study the dielectric response of ternary mixtures of commercial nematic liquid crystal mixtures E7 and E33,an organic solvent N-Methyl-2-Pyrrolidone(NMP)and...Dielectric spectroscopy,at room temperature(20℃),is used to study the dielectric response of ternary mixtures of commercial nematic liquid crystal mixtures E7 and E33,an organic solvent N-Methyl-2-Pyrrolidone(NMP)and a triblock polymers in the frequency range from 0.01Hz to 1MHz.The results indicate a dielectric relaxation in the hectohertz region.Individually,both E7 and NMP have rather large low frequency conductivities;however,the low frequency(0.01–10Hz)behavior of the mixtures has no such behavior.We attribute this behavior to an ion getter effect of the triblock polymer surfactant.Optimized ternary mixtures obtain a real dielectric constant near 230,and loss tangent less than 0.05 at frequencies near 10mHz.展开更多
基金This work was supported by the United States Office of Naval Research under contract N-000-14-05-1-0405.
文摘Dielectric spectroscopy,at room temperature(20℃),is used to study the dielectric response of ternary mixtures of commercial nematic liquid crystal mixtures E7 and E33,an organic solvent N-Methyl-2-Pyrrolidone(NMP)and a triblock polymers in the frequency range from 0.01Hz to 1MHz.The results indicate a dielectric relaxation in the hectohertz region.Individually,both E7 and NMP have rather large low frequency conductivities;however,the low frequency(0.01–10Hz)behavior of the mixtures has no such behavior.We attribute this behavior to an ion getter effect of the triblock polymer surfactant.Optimized ternary mixtures obtain a real dielectric constant near 230,and loss tangent less than 0.05 at frequencies near 10mHz.
