Evidence of cybotactic order in the nematic phase of a main-chain liquid crystal polymer with bent-core repeat unit

Francesco Vita; Katia Sparnacci; Guido Panzarasa; Immacolata F. Placentino; Salvatore Marino; Nicola Scaramuzza; Giuseppe Portale; Emanuela Di Cola; Claudio Ferrero; Sofia I. Torgova; Giancarlo Galli; Michele Laus; Oriano Francescangeli

doi:10.1021/mz400518x

Evidence of cybotactic order in the nematic phase of a main-chain liquid crystal polymer with bent-core repeat unit

Francesco Vita, Katia Sparnacci, Guido Panzarasa, Immacolata F. Placentino, Salvatore Marino, Nicola Scaramuzza, Giuseppe Portale, Emanuela Di Cola, Claudio Ferrero, Sofia I. Torgova, Giancarlo Galli, Michele Laus, Oriano Francescangeli

Dipartimento di Scienze e Innovazione Tecnologica

Risultato della ricerca: Contributo su rivista › Articolo in rivista › peer review

Abstract

We report the synthesis and structural characterization of a main-chain liquid crystal polymer constituted by a 1,2,4-oxadiazole-based bent-core repeat unit. For the first time, a liquid crystal polymer made of bent mesogenic units is demonstrated to exhibit cybotactic order in the nematic phase. Coupled with the chain-bond constraints, cybotaxis results in maximized molecular correlations that make this material of great potential in the search for the elusive biaxial and ferroelectric nematic phases. Indeed, repolarization current measurements in the nematic phase hint at a ferroelectric-like switching response (upon application of an electric field of only 1.0 V μm ^-1) that, albeit to be definitely confirmed by complementary techniques, is strongly supported by the comparative repolarization current measurements in the nematic and isotropic phases. Finally, the weak tendency of this polymer to crystallize makes it possible to supercool the cybotactic nematic phase down to room temperature, thus, paving the way for a glassy phase in which the biaxial (and possibly polar) order is frozen at room temperature.

Lingua originale	Inglese
pagine (da-a)	91-95
Numero di pagine	5
Rivista	ACS Macro Letters
Volume	3
Numero di pubblicazione	1
DOI	https://doi.org/10.1021/mz400518x
Stato di pubblicazione	Pubblicato - 21 gen 2014

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10.1021/mz400518x

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Vita, F., Sparnacci, K., Panzarasa, G., Placentino, I. F., Marino, S., Scaramuzza, N., Portale, G., Di Cola, E., Ferrero, C., Torgova, S. I., Galli, G., Laus, M., & Francescangeli, O. (2014). Evidence of cybotactic order in the nematic phase of a main-chain liquid crystal polymer with bent-core repeat unit. ACS Macro Letters, 3(1), 91-95. https://doi.org/10.1021/mz400518x

@article{661eb50457b04e07b86e43ea81f3d2c0,

title = "Evidence of cybotactic order in the nematic phase of a main-chain liquid crystal polymer with bent-core repeat unit",

abstract = "We report the synthesis and structural characterization of a main-chain liquid crystal polymer constituted by a 1,2,4-oxadiazole-based bent-core repeat unit. For the first time, a liquid crystal polymer made of bent mesogenic units is demonstrated to exhibit cybotactic order in the nematic phase. Coupled with the chain-bond constraints, cybotaxis results in maximized molecular correlations that make this material of great potential in the search for the elusive biaxial and ferroelectric nematic phases. Indeed, repolarization current measurements in the nematic phase hint at a ferroelectric-like switching response (upon application of an electric field of only 1.0 V μm -1) that, albeit to be definitely confirmed by complementary techniques, is strongly supported by the comparative repolarization current measurements in the nematic and isotropic phases. Finally, the weak tendency of this polymer to crystallize makes it possible to supercool the cybotactic nematic phase down to room temperature, thus, paving the way for a glassy phase in which the biaxial (and possibly polar) order is frozen at room temperature.",

author = "Francesco Vita and Katia Sparnacci and Guido Panzarasa and Placentino, {Immacolata F.} and Salvatore Marino and Nicola Scaramuzza and Giuseppe Portale and {Di Cola}, Emanuela and Claudio Ferrero and Torgova, {Sofia I.} and Giancarlo Galli and Michele Laus and Oriano Francescangeli",

year = "2014",

month = jan,

day = "21",

doi = "10.1021/mz400518x",

language = "English",

volume = "3",

pages = "91--95",

journal = "ACS Macro Letters",

issn = "2161-1653",

publisher = "American Chemical Society",

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}

Vita, F, Sparnacci, K, Panzarasa, G, Placentino, IF, Marino, S, Scaramuzza, N, Portale, G, Di Cola, E, Ferrero, C, Torgova, SI, Galli, G, Laus, M & Francescangeli, O 2014, 'Evidence of cybotactic order in the nematic phase of a main-chain liquid crystal polymer with bent-core repeat unit', ACS Macro Letters, vol. 3, n. 1, pagg. 91-95. https://doi.org/10.1021/mz400518x

TY - JOUR

T1 - Evidence of cybotactic order in the nematic phase of a main-chain liquid crystal polymer with bent-core repeat unit

AU - Vita, Francesco

AU - Sparnacci, Katia

AU - Panzarasa, Guido

AU - Placentino, Immacolata F.

AU - Marino, Salvatore

AU - Scaramuzza, Nicola

AU - Portale, Giuseppe

AU - Di Cola, Emanuela

AU - Ferrero, Claudio

AU - Torgova, Sofia I.

AU - Galli, Giancarlo

AU - Laus, Michele

AU - Francescangeli, Oriano

PY - 2014/1/21

Y1 - 2014/1/21

N2 - We report the synthesis and structural characterization of a main-chain liquid crystal polymer constituted by a 1,2,4-oxadiazole-based bent-core repeat unit. For the first time, a liquid crystal polymer made of bent mesogenic units is demonstrated to exhibit cybotactic order in the nematic phase. Coupled with the chain-bond constraints, cybotaxis results in maximized molecular correlations that make this material of great potential in the search for the elusive biaxial and ferroelectric nematic phases. Indeed, repolarization current measurements in the nematic phase hint at a ferroelectric-like switching response (upon application of an electric field of only 1.0 V μm -1) that, albeit to be definitely confirmed by complementary techniques, is strongly supported by the comparative repolarization current measurements in the nematic and isotropic phases. Finally, the weak tendency of this polymer to crystallize makes it possible to supercool the cybotactic nematic phase down to room temperature, thus, paving the way for a glassy phase in which the biaxial (and possibly polar) order is frozen at room temperature.

AB - We report the synthesis and structural characterization of a main-chain liquid crystal polymer constituted by a 1,2,4-oxadiazole-based bent-core repeat unit. For the first time, a liquid crystal polymer made of bent mesogenic units is demonstrated to exhibit cybotactic order in the nematic phase. Coupled with the chain-bond constraints, cybotaxis results in maximized molecular correlations that make this material of great potential in the search for the elusive biaxial and ferroelectric nematic phases. Indeed, repolarization current measurements in the nematic phase hint at a ferroelectric-like switching response (upon application of an electric field of only 1.0 V μm -1) that, albeit to be definitely confirmed by complementary techniques, is strongly supported by the comparative repolarization current measurements in the nematic and isotropic phases. Finally, the weak tendency of this polymer to crystallize makes it possible to supercool the cybotactic nematic phase down to room temperature, thus, paving the way for a glassy phase in which the biaxial (and possibly polar) order is frozen at room temperature.

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DO - 10.1021/mz400518x

M3 - Article

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Evidence of cybotactic order in the nematic phase of a main-chain liquid crystal polymer with bent-core repeat unit

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