新穎性1,3,4-Oxadiazole彎曲核心結構作為藍相液晶材料之設計與應用

Abstract

This thesis is based on our laboratory has published the results of literature on biaxial liquid crystal, as derived from the novel of blue phase liquid crystal molecular design and synthesis. The liquid crystal molecules designed to allow the laboratory published 1,3,4-oxadiazole as the core of the banana-shaped biaxial liquid crystal, and use the soft chain of different lengths to explore the liquid crystal phases. And then import a chirality of soft chain try to induce blue phase. Series one of molecules: OXD4f, OXD5f, OXD7f, OXD7f*. Then one side of the hard segment to change the number of benzene rings, but its structure is still asymmetry.Adding two functional groups fluorine and a chiral soft chain, as the basis of two functional groups to make control groups to compare their properties and try to induce blue phase. Series two of molecules: OXD5B7, OXD5B7F, OXD5B7*. Finally, we successfully synthesized a molecule which have BPIII property in the series one ,and also useed a blended method successfully induce blue phase, which blue phase temperature range from 39℃ room temperature. In the series of two, we successfully designed a single molecule which have BPIII property.Because the BPIII temperature range is too narrow,we can only be observed its texture in the POM,the range only about 0.5℃.We used the POM, DSC, UV-Visible, measurement of photoelectrical properties and XRD to verify the physical properties of these liquid crystals.