含氟盘状液晶研究进展

Research progress of fluorine-containing discotic liquid crystals

近年来,在分子中引入氟原子进行改性成为材料研究的热点之一。氟原子的引入可以影响分子的热性能、电荷输运性能以及液晶的相行为等,最终改善材料的热、光、电和磁等性质。含氟盘状液晶由于具有较高的载流子迁移率,其合成方法和性质得到了广泛的关注。在含氟盘状液晶分子的平面核上、外围侧链或桥体上取代的氟原子均能显著改变液晶的相变性质,如提升液晶相的热稳定性和柱状相的有序度等。该文综述了近十年来具有代表性的利用氟原子改性盘状液晶的研究进展,进一步证实氟化有利于改善液晶性质;归纳了含氟盘状分子在其他领域的应用;最后,提出了含氟盘状液晶存在的问题,并展望了其未来发展方向。

In recent years,introduction of fluorine atoms for material modification has become one of the hot research topics.The influence of introduction of fluorine atoms on the thermal properties,charge transport performance and liquid crystal phase behavior could improve the thermal,optical,electrical and magnetic properties of materials.The synthesis methods and properties of discoid liquid crystals containing fluorine have attracted extensive attention due to their high carrier mobility.Substitution by fluorine atoms in the core,chain and bridge positions can significantly improve the phase transformation properties,like thermal stability and columnar phase order degree of liquid crystals.In this review,research progress in recent ten years on modification of discotic liquid crystals by introduction of fluorine atoms was summarized,which proved that fluoridation was beneficial for property enhancement of liquid crystals,followed by discussions on applications of fluorine-containing liquid crystals in other fields.Finally,the existing problems and future development direction of fluorine-containing discotic liquid crystals were presented.