STRAIN-INDUCED DIRECTOR REORIENTATION IN NEMATIC LIQUID SINGLE-CRYSTAL ELASTOMERS
STRAIN-INDUCED DIRECTOR REORIENTATION IN NEMATIC LIQUID SINGLE-CRYSTAL ELASTOMERS
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DOI：
10.1002/marc.1995.030160908
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发表时间：
1995-09-01
影响因子：
4.6
通讯作者：
FINKELMANN, H
中科院分区：
文献类型：
--
作者：
KUNDLER, I;FINKELMANN, H
研究了液晶弹性体中指向矢与外应力轴成任意夹角时的应变诱导指向矢重取向过程。如果机械应力垂直于原始指向矢轴施加，则重新取向过程在阈值应变处开始。在外加应力的作用下，液晶基元以顺时针或逆时针方向排列，单畴结构发生畸变，形成周期性的图案。如果相对于原始指向矢轴倾斜地施加机械应力，则在保持单畴结构的情况下获得均匀的指向矢重取向。没有观察到该过程的阈值应变。在指向矢与外部应力轴垂直布置的情况下，阈值应变的存在可以理解为单畴结构畸变的结果。
The strain-induced director reorientation process in nematic liquid single crystal elastomers is investigated for the case of an arbitrary angle between the original director and the external stress axis. If the mechanical stress is applied perpendicular to the original director axis, the reorientation process sets in at a threshold strain. The mesogens are realigning 'clockwise' or 'counter-clockwise' towards the axis of external stress, simultaniously the monodomain structure is distorted and a periodic pattern formation is observed. If the mechanical stress is applied obliquely with respect to the original director axis, a uniform director reorientation is obtained with retention of the monodomain structure. No threshold strain is observed for this process. The existence of a threshold strain in the case of a perpendicular arrangement of the director to the external stress axis can be understood as a consequence of the distortion of the monodomain structure.