侧链型液晶聚合物对手性向列相液晶螺旋结构的影响研究

Effect of Side-Chain Liquid Crystalline Polymer on Helical Structure of Chiral Nematic Liquid Crystal

通过改变表面的锚定条件,可以在不借助外部条件的情况下获得热力学稳定态的长程有序的螺旋结构。通过调节沉积在硅晶片上的液晶聚合物[6-(4-甲氧基-偶氮苯-4′-氧基)甲基丙烯酸乙酯](PMMAZO)的接枝密度来调节表面锚定,从而实现对螺旋结构的螺距和螺旋方向的准确控制。随着接枝密度的增加,螺旋结构的倾斜变形增加,螺距的大小被抑制;随着液晶盒厚度的增加,形态会从长程有序的条纹状逐渐过渡到指纹状。

By varying the anchoring condition,the helical structure with a long-range order is achieved as a thermodynamically stable state without external supports.Poly[6-(4-methoxy-azobenzene-4′-oxy)hexyl methacrylate](PMMAZO)is deposited onto the silicon substrate to tune the anchoring.Both orientation and pitch can be controlled by varying the PMMAZO grafting density.As the grafting density increases,the enhanced titled deformation of helical structure suppresses the pitch size.As the cell thickness increases,the pattern transition from a long-range order stripe to a small fingerprint domain is facilitated.