New Ferroelectric Liquid Crystals Having 2-Fluoro-2-Methyl Alkanoyloxy Group
New Ferroelectric Liquid Crystals Having 2-Fluoro-2-Methyl Alkanoyloxy Group
复制标题
具有2-氟-2-甲基烷酰氧基的新型铁电液晶
DOI：
10.1080/00268949108030924
复制
发表时间：
1991
影响因子：
0.7
通讯作者：
Mamoru Yamane
中科院分区：
文献类型：
--
作者：
N. Shiratori;A. Yoshizawa;I. Nishiyama;Mitsuo Fukumasa;Akihisa Yokoyama;T. Hirai;Mamoru Yamane
摘要我们制备了具有新设计的手性部分2-氟-2-甲基烷酰氧基的铁电液晶。将具有该手性部分的铁电液晶的物理性质与具有2-氟烷酰氧基、2-三氟甲基烷酰氧基、2-氟-2-三氟甲基烷酰氧基和2-甲基烷酰氧基的其它铁电液晶的物理性质进行比较。与其它含氟铁电液晶相比，具有2-氟-2-甲基烷酰氧基的铁电液晶显示出大的自发极化。我们研究了核结构对自发极化的影响。在核心部分引入嘧啶环极大地增强了自发极化，超过400 nC/cm 2。此外，我们还研究了具有该手性部分的化合物的手性掺杂剂的影响。
Abstract We have prepared ferroelectric liquid crystals with newly designed chiral part, 2-fluoro-2-methyl alkanoyloxy group. The physical properties of the ferroelectric liquid crystals having this chiral part are compared with those of other ferroelectric liquid crystals having 2-fluoro alkanoyloxy group, 2-trifluoromethyl alkanoyloxy group, 2-fluoro-2-trifluoromethyl alkanoyloxy group and 2-methyl alkanoyloxy group. The ferroelectric liquid crystals having 2-fluoro-2-methyl alkanoyloxy group show large spontaneous polarization, compared with other fluorinated ferroelectric liquid crystals. We have investigated the effect of the core structures on the spontaneous polarization. Introduction of a pyrimidine ring in the core part extremely enhances spontaneous polarization, over 400 nC/cm2. Moreover, we have also investigated the effect of chiral dopants of the compound having this chiral part.