Electro‐optical behavior of ferroelectric liquid crystalline polyphenylene derivatives
作者： Kiyoshi Suda , Kazuo Akagi
DOI: 10.1002/POLA.22698
关键词: Ferroelectricity 、 Crystallography 、 Conjugated system 、 Polymer 、 Electric field 、 Materials science 、 Phase transition 、 Ferroelectric polymers 、 Polarization (electrochemistry) 、 Side chain 、 Polymer chemistry
摘要: Liquid crystalline (LC) polyphenylene derivatives, such as poly(paraphenylene) (PPP), poly(meta-phenylene) (PMP), poly(meta-biphenylene) (PBP), and poly (meta-terphenylene) (PTP) were synthesized through substitution of fluorine-containing chiral LC groups into side chains, with an aim to develop ferroelectric (FLC) conjugated polymers. All the polymers, except PTP, showed enantiotropic liquid crystallinities, where several types mesophases observed in both heating cooling processes. Among them, PPP PMP derivatives smectic C (S c *) phases responsible for ferroelectricity. In fact, they exhibited quick response electric field, spite high viscosities inherent giving rise switching times less than 1 s between two Sc states reversely directed alignment. Hysteresis loops polarization field also PMP. The spontaneous (P ) remained unchanged even after became zero, affording residual R whose value was same that P . This indicates has a prospective memory function based on FLC nature. present study is first report realizing macroscopic alignment using generating potential π-conjugated It elucidated unusual polymer main chains polyphenylenes can be used prepare new
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