PAb17 せん断流動下における高分子液晶の相転移挙動

抄録

Side chain liquid crystalline polymers (SCLCPs) exhibit essentially electro-rheological(ER) properties. The coagulated stxuctures induced by electric fields and shear flow have been investigated in order to analyze the mechanism of ER. The ER effect was obtaained at the temperature range above the isotropization point under shear flow. We observed the phase transition of SCLCP under shear flow at various shear rates at elevated temperatures using a microscope shearing system. The SCLCP used in this study exhibited an isotropic/smectic phase transition at 35.8℃. The liquid crystalline structures, however, could be observed at higher temperatures under shear flow. The phase transtion temperature of SCLCP increased with increasing shear rate. It suggests that the liquid crystalline structures were induced by shear flow.