A Design of novel Side-chain Liquid Crystalline Polymers Using Optically Active Functional Group

本研究计划旨在设计及合成具有光学活性之液晶高分子。特别是液晶高分子的设计思想是基于高分子主链的高序结构，如高分子的立体构型和构象性质，在两年的研究过程中，完成了几种主链由1，3-二烯、氧杂环丁烷、苯乙烯和环氧化合物组成的新型高分子。开发这些聚合物显示出有趣的液晶特性，应该指出的是，在一些新型聚合物中，作为液晶起源的主链和侧链介晶基团通过硅氧烷键连接，显示出非常高的流动性。在含硅氧烷侧链液晶聚合物的合成方面，发展了一种新的制备功能化硅氧烷的合成方法。该方法基于使用官能化有机金属试剂裂解环状硅氧烷以提供具有官能团的新型二硅氧烷。本研究结果对设计含光学活性基团的液晶聚合物具有重要的参考价值。不断的研究将导致这一领域的进一步发展。

This research project is aimed to desing and synthesize novel liquid crystalline polymers using optically active functional group. In particular, the concept to design the liquid crystalline polymer is based upon the higer order structure of the polymer main chain, such as stereoregularities of the polymers and conformational properties.Throughout the reserch project in the period of two years, several novel polymers, whose main chains are composed of 1,3-dienes, oxetanes, stirenes and epxides, were carried out. developed. These polymers exhibited interesting liquid crystalline characters.It should be pointed out that in some of the novel polymers main chain and side chain mesogenic groups which is the origin of liquid crystallinity is connected through siloxane bond, showing remarkably high mobility. Concerning the synthesis of siloxane containing side chain liquid crystalline polymers, a novel synthetic strategy to prepare functionalized siloxanes was developed. The method is based on the cleavage of cyclic siloxanes using functionalized organometallic reagent to furnish novel disiloxanes with functional groups. The results of this research project implied considerably significant information to design the liquid crystalline polymers containing optically active fucntional groups. Continuous studies will lead to further development in this field.