Frustrated phase behavior of chiral side-chain polymer

Mikhail V. Kozlovsky; Michael Darius; Wolfgang Haase

doi:10.1117/12.301296

1 January 1998 Frustrated phase behavior of chiral side-chain polymer

Mikhail V. Kozlovsky, Michael Darius, Wolfgang Haase

Proceedings Volume 3319, Liquid Crystals: Chemistry and Structure; (1998) https://doi.org/10.1117/12.301296
Event: Liquid Crystals, 1997, Zakopane, Poland

Abstract

The polymer P8*5 has a frustrated phase behaviour. It shows either the sequence of mesophases g 3 1-35°C S 44°C SA* 47°C i or g 3 1-35°C TGBC 47°C i. It is not completely understood yet under which conditions one of the phase sequences is prefered. Both phase sequences are kinetically stable and reproducible. Similar behaviour has been observed earlier1'2 for the acrylic copolymer C37, but no detailed study ofthe two phase modification was carried out. The "subcritical" phase condition of the substance should be the reason for extremely low driving voltage values of optical switching in S* p1c ( O.2V4tm) and for extremely low untwisting voltages (0.5 - 1.5V/iim), as well as for the low clearing point values and for the existence of the switchable Sc p close to room temperature. The siloxane main chain of the polymer should be less preferable for the formation of a highly twisted, weakly birefringent TGB-like phases, as compared with the methacrylic one, since for the latter such a frustration can be achieved only by addition of63% of nonchiral moieties to the structure ofthe copolymer"2. Keywords: ferroelectnc polymer liquid crystal, tilt angle, pyroelectric coefficient, hysteresis, X-ray

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Mikhail V. Kozlovsky, Michael Darius, and Wolfgang Haase "Frustrated phase behavior of chiral side-chain polymer", Proc. SPIE 3319, Liquid Crystals: Chemistry and Structure, (1 January 1998); https://doi.org/10.1117/12.301296

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