Effect of the composition on the structure and ferroelectric properties of side chain liquid crystalline copolyacrylates

Alexandrov, A. I.; Andruzzi, F.; Константинов, И. И.; Magagnini, Pier Luigi; Paci, Massimo; Pashkova, T. V.; Tassi, Eliana; Yablonsky, S. V.

doi:10.1080/00150199808217379

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…These 0 values are comparable to those of the tilt angles of molecules in smectic layers of acrylates 3 (26 ~ and 4 (27 ~ calculated from the XDA data. 16 The aligned samples of acrylates 2--4 were photopolymerizcd in the medium temperature region of the smectic state. Unlike the photopolymerization of acrylate 1, accompanied by some distortion of ordering, the photolysis of acrylates 2--4 occurs with the complete retention of orientational ordering in the polymer films formed.…”

Section: Resultsmentioning

confidence: 99%

IR dichroism study of orientational ordering of liquid-crystalline acrylates

et al. 1999

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Orientational ordering of four liquid-crystalline acrylates induce,~ c;v, the surface of KBr plates over a wide temperature range was studied by the IR dichroism techmqL,~. "R spectra of homogeneously aligned samples were used to calculate the angles between the direction oL the transition moment fo/" a series of vibrations of the mesogenic fragment and its long axis. A method for calculation of the homeotropic orientation parameter of molecnles was proposed. The orientation parameters of homogeneously and homeotropically aligned samples in the nematic, smectic (A), and chiral smectic (I and H) phases were calculated. The in situ photopolymerization of acrylates in the smectic phases occurs with retention of the orientational ordering in the polymer films formed.

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Section: Resultsmentioning

confidence: 99%

IR dichroism study of orientational ordering of liquid-crystalline acrylates

et al. 1999

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“…Настоящая работа является логическим продолжением ранее проведенных исследований структуры хиральных и ахиральных акрилатов и их смесей [1] в рамках проблемы поиска молекулярных систем, способных к образованию хиральных смектических фаз [2,3], интерес к которым вызван обнаружением у этих фаз сегнето-, пиро-и пьезоэлектрических свойств [4]. Необходимое условие обладания такими свойствами -присутствие в молекулах латеральных фрагментов с дипольными моментами, обеспечивающими большой суммарный дипольный момент, что можно осуществить путем определенного расположения хиральных групп при синтезе молекул.…”

Section: Introductionunclassified

Structure Investigation of Mesogenic Homo- and Copolymers Based on Chiral and Achiral Acrylates

Alexandrov,

Pashkova

2023

Liq. Cryst. and their Appl.

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The X-ray diffraction method was used to study the structure of mesogenic homo- and copolymers based on chiral and achiral acrylates (disubstituted biphenyl and phenylbenzoate) under the orienting influence of magnetic and (in some cases) electric fields. The analysis of diffraction patterns was carried out in terms of the Hosemann model of a paracrystal using structural modeling and diffraction calculations on models. It was established that chiral and achiral homopolymers form smectic bilayer polar structures, but the structure of the achiral homopolymer possesses weak polarization due to small value of total dipole moment of C=O groups in the side chains. The copolymers (as the chiral homopolymer) form smectic bilayer polar helicoidal structures. The distribution of chiral and achiral components in the layers of the common bilayer depends on their ratios in the copolymer. In turn, this distribution affects both the step of helicoidal structure and the nature of structural-phase transformations in the copolymers. A comparative evaluation of the orientational effects of magnetic and electric fields on the structure of the chiral homopolymer and the copolymers has been carried out. The analysis of the temperature dependences of diffraction and structural parameters of the investigated polymers allowed us to explain some features of their behaviour within seemingly similar (by the type of X-ray patterns) smectic phases.

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Effect of the composition on the structure and ferroelectric properties of side chain liquid crystalline copolyacrylates

Cited by 2 publications

References 6 publications

IR dichroism study of orientational ordering of liquid-crystalline acrylates

IR dichroism study of orientational ordering of liquid-crystalline acrylates

Structure Investigation of Mesogenic Homo- and Copolymers Based on Chiral and Achiral Acrylates

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