磁场作用下的高分子液晶流的相变过程  

Phase Diagram of Polymeric Liquid Crystalline Flows under Magnetic Field

作　　者：徐威[1] 付淑芳[1] 白晶[1] 张喜田[1] 

机构地区：[1]哈尔滨师范大学物理与电子工程学院,黑龙江哈尔滨150000

出　　处：《液晶与显示》2008年第4期421-426,共6页Chinese Journal of Liquid Crystals and Displays

基　　金：2007年黑龙江省教育厅海外学人科研资助(No1152hq013);哈尔滨师范大学科研资助(NoKM2006-14)

摘　　要：利用Doi理论研究在磁场和剪切流同时作用下的高分子液晶的分子动力学问题。由于系统受到磁场的影响,在低剪切率范围内出现一种新型的稳定状态(new aligning)。并且这一领域随磁场强度的增加不断地扩大,进而导致了不稳定状态(tumbling)领域的逐渐减小,直至消失。因此,系统在这一领域的有序度可以被大幅度的提高。另一方面,在通常意义下的稳定状态(normal aligning)领域内,剪切率产生的力矩大于磁场产生的力矩,因而系统的有序度提高的幅度很小。Computational investigation of the effect of magnetic fields on the molecular orientation of polymeric liquid crystals under shear flows was achieved using the Doi theory. When a magnetic field was imposed, a new steady state （aligning） emerged in low shear rates. The new aligning region increased with the increasing of magnetic field strength so that the unsteady state （tumbling） region was reduced, finally disappeared. The higher order parameter of the system in this new aligning region was expected. However, when magnetic fields were imposed in an aligning region, a slightly improvement of the order parameter was obtained.

关 键 词：高分子液晶流 磁场 剪切流 有序度 

分 类 号：O753.2[理学—晶体学]