The effects of a second branched alkyl chain and double chiral centres on the phase transition and spontaneous polarization of a chiral smectic liquid crystal |
| |
Authors: | Atsushi Yoshizawa Akihisa Yokoyama Isa Nishiyama |
| |
Institution: |
a Materials Development Research Laboratories, Nippon Mining Co., Ltd., Saitama, Japan |
| |
Abstract: | The effects of a second branched alkyl chain, lateral substitution, and double chiral centres on the phase transition and spontaneous polarization of the ferroelectric liquid crystal having a 2-methylalkanoyl group have been investigated. The introduction of another branched alkyl chain away from the 2-methylalkanoyl group causes a sharp SC*-SA transition peak and also enhances the ferroelectric properties in the SC* phase. Since the order within the layers is liquid-like in the SC* phase, the alkyl chain branching away from both the chiral centre and a polar group affects the overall motion of the molecule in the SC* phase. In the system of a compound with double chiral centres, the existence of the chiral centre in the 2-methylalkanoyl group affects the phase transition temperatures and the magnitude of the spontaneous polarization in the SC* phase. On the other hand, the existence of the chiral centre in the 2-methylbutyl group only affects the stability of a more highly ordered smectic phase appearing below the SC* phase. |
| |
Keywords: | |
本文献已被 InformaWorld 等数据库收录! |
|