Novel antiferroelectric liquid crystals with a phenylpiperazine moiety in the mesogenic core structure
| Autor: | Nawalage F. Cooray, I. Kawamura, Yoshiichi Suzuki |
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| Rok vydání: | 1999 |
| Předmět: | |
| Zdroj: | Liquid Crystals. 26:1197-1203 |
| ISSN: | 1366-5855 0267-8292 |
| DOI: | 10.1080/026782999204228 |
| Popis: | A novel series of antiferroelectric liquid crystalline compounds having a phenylpiperazine unit and a biphenyl or a phenyl moiety in the core structure was synthesized using the optically active alcohols 2-methyl octanol and 1,1,1-trifluoromethyl octanol. Most of the compounds exhibited enantiotropic SmC*A, SmC* and SmA mesophases. The phase transition temperatures, response times, sponta A neous polarizations and the field-transmittance hysteresis loops were monitored. These data were compared with those of the MHPOBC compounds, which represent the most conventional core structure of the biphenyl/phenyl combination. The replacement of the biphenyl moiety, with the phenylpiperazine unit, reduced the isotropization temperature as well as the SmC*A-SmC transition point. It was found that some of the new compounds, which consisted ofAan octyl or a nonyl terminal chain with a 2-methyloctyl 2-fluorophenylcaboxylate group in the core structure, could have a potential application in display devices. Some work on... |
| Databáze: | OpenAIRE |
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