权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Expansion of temperature range of liquid crystalline frustrated phase

液晶受挫相温度范围的扩大

基本信息

批准号：
15350136
负责人：
KIKUCHI Hirotsugu
金额：
$ 9.73万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2006
项目状态：
已结题

项目摘要

Preparation condition for stabilizing the polymer-stabilized blue phases which show liquid crystalline blue phase in a wide temperature range has been investigated. It becomes clear that the binary mixture of a monoacrylate monomer and a diacrylate monomer is required to stabilize the blue phase by isothermal photo-polymerization method. The photo-polymerization for preparing the polymer-stabilized blue phases was necessary to be carried out in the temperature range of the blue phase.Stabilizing the blue phase II, which is more difficult to stabilize than blue phase I, by photo-polymerization was conducted in a accuracy of temperature within 0.1 degree Celsius. High polymer-stabilizing effect of blue phase II was attained for the first time when the photo-polymerization was made within 0.3 degree Celsius in the temperature range of blue phase II.The blue phases possess great potential because of their unique characteristics, such as fast electrio-optical response, electrically controllable Bragg diffraction of visible light and a photonic band. We found that the response is much faster, the order of 10-100 micro-second on the rise and decay processes at room temperature and the zero-electric field state is optically isotropic unlike nematic phases, that is, no surface treatment (no rubbing) is necessary, leading to a simplification of the fabrication process. We also demonstrate the sufficiently large electric field-induced birefringence and the micro-second response of the polymer-stabilized blue phases without any surface treatment. Thus the polymer-stabilized blue phase has been shown to possess excellent properties which will contribute toward providing new liquid crystal displays with high quality and low cost.

研究了在较宽温度范围内显示液晶蓝相的聚合物稳定蓝相的制备条件。很明显，通过等温光聚合方法，需要单丙烯酸酯单体和双丙烯酸酯单体的二元混合物来稳定蓝相。用于制备聚合物稳定化蓝相的光聚合必须在蓝相的温度范围内进行，通过光聚合稳定化比蓝相I更难稳定化的蓝相II是在0.1 ℃以内的温度精度下进行的。当在蓝相II的温度范围内在0.3 ℃内进行光聚合时，首次获得了高的蓝相II的聚合物稳定效果。蓝相具有独特的特性，例如快速的电光响应，可见光的电控布拉格衍射和光子带，因此具有很大的潜力。我们发现，响应快得多，在室温下的上升和衰减过程为10-100微秒的数量级，并且零电场状态是光学各向同性的，不像非晶相，也就是说，不需要表面处理（没有摩擦），从而简化了制造过程。我们还证明了足够大的电场诱导的双折射和微秒响应的聚合物稳定的蓝相没有任何表面处理。因此，聚合物稳定的蓝相已被证明具有优异的性能，这将有助于提供具有高质量和低成本的新的液晶显示器。