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首页> 外文期刊>Progress in Organic Coatings: An International Review Journal >MEASUREMENT OF RHEOLOGICAL PROPERTIES FOR SMECTIC-A LIQUID CRYSTAL BY USING ULTRASONIC RHEOMETER AND ROTATIONAL VISCOMETER [Review]
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MEASUREMENT OF RHEOLOGICAL PROPERTIES FOR SMECTIC-A LIQUID CRYSTAL BY USING ULTRASONIC RHEOMETER AND ROTATIONAL VISCOMETER [Review]

机译:用超声波流变仪和旋转粘度计测量Scmicic-a液晶的流变性能[综述]

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摘要

The relationship between the rheological properties and the alignment direction of liquid crystals was studied using a rotational viscometer and an ultrasonic rheometer. 4-Cyano-4'-n-octylbiphenyl (8CB) was used for the sample. The measurements of viscosity for 8CB were carried out using the rotational viscometer having parallel plate geometry. The parallel plates were made from glass and covered by polyimide film with rubbing to align the liquid crystal molecules, The oriented structure of 8CB was examined using a polarizing microscope optical system which was built in the rotational viscometer. When the direction of shearing was perpendicular to the layers of smectic 8CB, the apparent viscosity was higher than that in the case of no-rubbing. Viscoelastic properties at ultrasonic frequency (3 MHz) were examined by the ultrasonic rheometer using a fused-quartz delay line. When the shear wave vibration was perpendicular to the smectic layers, G' was observed, However, when the shear wave vibration was parallel to the smectic layers, G' was not observed. (C) 1997 Elsevier Science S.A. [References: 13]
机译:使用旋转粘度计和超声流变仪研究了液晶的流变性质和取向方向之间的关系。样品使用4-氰基-4'-正辛基联苯(8CB)。使用具有平行板几何形状的旋转粘度计进行8CB的粘度的测量。平行板由玻璃制成,并用聚酰亚胺膜覆盖并摩擦以使液晶分子对准。使用内置在旋转粘度计中的偏光显微镜光学系统检查8CB的取向结构。当剪切方向垂直于近晶8CB层时,表观粘度高于无摩擦情况下的表观粘度。使用熔融石英延迟线通过超声流变仪检查在超声频率(3 MHz)下的粘弹性。当剪切波振动垂直于近晶层时,观察到G',但是,当剪切波振动平行于近晶层时,则未观察到G'。 (C)1997 Elsevier Science S.A. [参考文献:13]

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