Polymer Surface-Induced Order of Liquid Crystalline Molecular Alignment Based on Nematic–Isotropic Phase Transition Behavior
Polymer Surface-Induced Order of Liquid Crystalline Molecular Alignment Based on Nematic–Isotropic Phase Transition Behavior
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基于向列相-各向同性相变行为的聚合物表面诱导液晶分子排列有序性
DOI：
10.1295/polymj.31.160
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发表时间：
1999
期刊：
影响因子：
2.8
通讯作者：
T. Kajiyama
中科院分区：
文献类型：
--
作者：
Sung;H. Kikuchi;T. Kajiyama
通过比较向列相-各向同性相变温度(TnI)和本体相变温度(TnI)来评价液晶分子在(聚合物/液晶)界面上的排列顺序。使用液晶盒测量了TnI的厚度依赖关系，在液晶盒中，在没有表面处理的情况下，在聚合物表面之间夹着一层LC薄层。液晶分子在(聚合物/液晶)界面的排列顺序随着聚合物基板表面自由能的增加而增加。结晶聚合物的表面提供了较高的液晶分子排列顺序。与亲水性相比，(聚合物/液晶)界面疏水分子间相互作用可能是导致液晶界面分子排列有序度增加的主要原因。
Alignment order of liquid crystal (LC) molecules at the (polymer/LC) interface was evaluated by comparing nematic-isotropic phase transition temperatures (TNI) at the interface with TNI in the bulk. The thickness dependence of TNI was measured using the LC cell in which an LC thin layer was sandwiched between polymer surfaces without surface treatment. The order of LC molecular alignment at the (polymer/LC) interface increased with surface free energy of the polymer substrate. The surface of crystalline polymer provided higher order of LC molecular alignment. Hydrophobic intermolecular interactions at the (polymer/LC) interface may be more responsible for increase in the interfacial molecular alignment order of LC in comparison with the hydrophilic one.