Menzel A M, Pleiner H, Brand H R
Theoretische Physik III, Universität Bayreuth, 95440, Bayreuth, Germany.
Eur Phys J E Soft Matter. 2009 Dec;30(4):371-7. doi: 10.1140/epje/i2009-10535-2. Epub 2009 Dec 5.
We investigate the response of prestretched nematic side-chain liquid single-crystal elastomers to superimposed external shear, electric, and magnetic fields of small amplitude. The prestretching direction is oriented perpendicular to the initial nematic director orientation, which enforces director reorientation. Furthermore, the shear plane contains the direction of prestretch. In this case, we obtain a strongly decreased effective shear modulus in the vicinity of the onset and the completion of the enforced director rotation. For the same regions, we find that it becomes comparatively easy to reorient the director by external electric and magnetic fields. These results were derived using conventional elasticity theory and its coupling to relative director-network rotations.
我们研究了预拉伸向列型侧链液晶单晶弹性体对叠加的小振幅外部剪切、电场和磁场的响应。预拉伸方向垂直于初始向列指向矢方向，这会强制指向矢重新定向。此外，剪切平面包含预拉伸方向。在这种情况下，我们发现在强制指向矢旋转开始和结束附近，有效剪切模量大幅降低。对于相同区域，我们发现通过外部电场和磁场重新定向指向矢变得相对容易。这些结果是使用传统弹性理论及其与相对指向矢网络旋转的耦合推导得出的。
