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Volume 13
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10.3390/cryst13010096
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Article

New Liquid Crystalline Elastomeric Films Containing a Smectic Crosslinker: Chemical and Physical Properties

by
Andraz Resetic
1,
Jerneja Milavec
1,
Alexej Bubnov
2,
Damian Pociecha
3,
Vera Hamplova
2,
Ewa Gorecka
3,
Bostjan Zalar
1 and
Valentina Domenici
4,*
1
Department of Solid State Physics, Jozef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia
2
Institute of Physics, Czech Academy of Sciences, Na Slovance 1999/2, 182 21 Prague, Czech Republic
3
Department of Chemistry, University of Warsaw, Zwirki i Wigury 101, 02-089 Warszawa, Poland
4
Dipartimento di Chimica e Chimica Industriale, Università di Pisa, via Moruzzi 13, 56124 Pisa, Italy
*
Author to whom correspondence should be addressed.
Crystals 2023, 13(1), 96; https://doi.org/10.3390/cryst13010096
Submission received: 16 December 2022 / Revised: 30 December 2022 / Accepted: 1 January 2023 / Published: 4 January 2023
(This article belongs to the Special Issue Feature Articles in Liquid Crystals from Our Editorial Board Members and Their Colleagues, 2022/2023)
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Abstract

Side-chain liquid crystal elastomers (SC-LCEs) have been designed by using a new smectic crosslinker. Two types of monodomain films were prepared based on polysiloxane chains, with a different relative concentration of both crosslinker and mesogenic comonomers. The mesomorphic behavior of the two SC-LCE systems was investigated by differential scanning calorimetry and polarized optical microscopy showing a different mesomorphic behavior: in one case, we obtained a nematic SC-LCE film, in the other case, a Smectic A SC-LCE film. In both systems, the mesophases were stable in a wide temperature range. Moreover, the SC-LCE films possess a relatively high orientation at room temperature. The physical-chemical properties, such as the local orientational ordering, structural organization, and dynamics of SC-LCEs’ constituents were studied by means of static and dynamic 2H NMR experiments, small-angle X-ray, and wide-angle X-ray diffractions. The relevant physical properties, such as the thermo-elastic and thermo-mechanic behaviors, are reported and discussed in view of the practical applications.
Keywords: liquid crystal elastomers; nematic; smectic A; thermo-mechanic; thermos-elastic; 2H NMR; X-ray diffraction; orientational order; dynamic properties liquid crystal elastomers; nematic; smectic A; thermo-mechanic; thermos-elastic; 2H NMR; X-ray diffraction; orientational order; dynamic properties

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MDPI and ACS Style

Resetic, A.; Milavec, J.; Bubnov, A.; Pociecha, D.; Hamplova, V.; Gorecka, E.; Zalar, B.; Domenici, V. New Liquid Crystalline Elastomeric Films Containing a Smectic Crosslinker: Chemical and Physical Properties. Crystals 2023, 13, 96. https://doi.org/10.3390/cryst13010096

AMA Style

Resetic A, Milavec J, Bubnov A, Pociecha D, Hamplova V, Gorecka E, Zalar B, Domenici V. New Liquid Crystalline Elastomeric Films Containing a Smectic Crosslinker: Chemical and Physical Properties. Crystals. 2023; 13(1):96. https://doi.org/10.3390/cryst13010096

Chicago/Turabian Style

Resetic, Andraz, Jerneja Milavec, Alexej Bubnov, Damian Pociecha, Vera Hamplova, Ewa Gorecka, Bostjan Zalar, and Valentina Domenici. 2023. "New Liquid Crystalline Elastomeric Films Containing a Smectic Crosslinker: Chemical and Physical Properties" Crystals 13, no. 1: 96. https://doi.org/10.3390/cryst13010096

APA Style

Resetic, A., Milavec, J., Bubnov, A., Pociecha, D., Hamplova, V., Gorecka, E., Zalar, B., & Domenici, V. (2023). New Liquid Crystalline Elastomeric Films Containing a Smectic Crosslinker: Chemical and Physical Properties. Crystals, 13(1), 96. https://doi.org/10.3390/cryst13010096

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