Supramolecular Liquid Crystals Based on Cyclodextrins

Champagne, Patrick; Kumar, Rajesh; Ling, Chang‐Chun

doi:10.1007/978-3-319-76162-6_7

Cited by 4 publications

(4 citation statements)

References 171 publications

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“…LCPs are of great interest because of their potential use as biomedical, photoelectric, and smart stimuli-responsive materials as well as thermally switchable light shutters. 12 The transition between the different mesophasesfrom the crystalline, smectic, nematic-to-isotropic phasetakes place at specific temperatures that can be characterized by differential scanning calorimetry (DSC), while the nature and texture of the mesophases are examined by polarized optical microscopy (POM). 5 The chiral nematic mesophase can also be obtained under mechanical stress or shear stress during the melt processing.…”

Section: ■ Introductionmentioning

confidence: 99%

Poly(l-Lactide) Liquid Crystals with Tailor-Made Properties Toward a Specific Nematic Mesophase Texture

Janeczek

Duale

Sikorska

et al. 2022

ACS Sustainable Chem. Eng.

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This paper presents the liquid crystal (LC) properties of poly( l -lactide) (PLLA). Mesophase behavior is investigated using polarized optical microscopy, X-ray diffraction, and differential scanning calorimetry. The performed analyses confirm that pressed PLLA films exhibit the unique capability of self-assembling into a nematic mesophase under the influence of mechanical pressure, temperature, and time. It was originally demonstrated that the chiral nematic mesophase can be obtained by introducing fine powders into the polymer. Based on the research conducted, it was proved that the pressed PLLA films have a chiral nematic mesophase with a nematic-to-isotropic phase transition and a large mesophase stability range overlapping the temperature of the human body, which can persist for years at ambient temperature. The obtained films show tailor-made properties toward a nematic mesophase with a specific texture, including colored planar texture of the chiral nematic mesophase and blue-phase (BP) LC texture. The BP, described for the first time in plain PLLA, occurred over a wider than usual temperature range of stability between isotropic and chiral nematic thermotropic phases (Δ T ≈ 9 °C), which is an advantage of the obtained polymer material, in addition to ease of preparation. This opens up new prospects for advanced photonic green applications.

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Section: ■ Introductionmentioning

confidence: 99%

Poly(l-Lactide) Liquid Crystals with Tailor-Made Properties Toward a Specific Nematic Mesophase Texture

Janeczek

Duale

Sikorska

et al. 2022

ACS Sustainable Chem. Eng.

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“…Native CD molecules are not capable of forming thermotropic liquid crystals (LCs) [ 14 ]. As LCs have some of the typical properties of liquids (regarding their mobility at room temperature, RT) and some properties of solid crystals, they are an intermediate state between crystal and liquid, and therefore said to be mesophases.…”

Section: Introductionmentioning

confidence: 99%

“…CD inclusion complexes may also exhibit LC properties in an aqueous medium [ 18 ]. CD-based thermotropic LC systems can be divided into LCs based on CD derivatives having aliphatic chains and polar groups or containing mesogenic groups, in addition to CD-based LC polymers [ 14 ]. Many surfactants can form LC structures with CDs.…”

Section: Introductionmentioning

confidence: 99%

Nematic-to-Isotropic Phase Transition in Poly(L-Lactide) with Addition of Cyclodextrin during Abiotic Degradation Study

Rydz

Duale

Janeczek

et al. 2022

IJMS

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Poly(L-lactide) is capable of self-assembly into a nematic mesophase under the influence of temperature and mechanical stresses. Therefore, subsequent poly(L-lactide) films were obtained and characterized, showing nematic liquid crystal properties both before and after degradation. Herein, we present that, by introducing β-cyclodextrin into the polymer matrix, it is possible to obtain a chiral nematic mesophase during pressing, regardless of temperature and time. The obtained poly(L-lactide) films exhibiting liquid crystal properties were subjected to degradation tests and the influence of degradation on these properties was determined. Thermotropic phase behavior was investigated using polarized optical microscopy, X-ray diffraction, and differential scanning calorimetry. The degradation process demonstrated an influence on the liquid crystal properties of pressed polymer films. The colored planar texture of the chiral nematic mesophase, which was not observed prior to degradation in films without the addition of β-cyclodextrin, appeared after incubation in water as a result of the entrapment of degradation products in the polymer matrix. These unusual tailor-made properties, obtained in liquid crystals in (bio)degradable polymers using a simple method, demonstrate the potential for advanced photonic applications.

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“…Over the past few years, we have been developing a group of supramolecular liquid crystals based on biodegradable cyclodextrins (CDs), a family of macrocyclic carbohydrates based on nontoxic glucose. − CDs were found to be excellent scaffolds to design liquid crystalline materials, due to their polyfunctionalities and the presence of a unique face-to-face pseudosymmetry that originates from the placement of all primary hydroxyl groups at one end of the macrocycle (primary face) and all secondary hydroxyl groups at the opposite end (secondary face). These features allow for efficient regioselective derivatization through which multiple copies of incompatible functionalities such as hydrophobic/hydrophilic groups can be grafted to each face of the macrocycle.…”

Section: Introductionmentioning

confidence: 99%

Amphiphilic Cyclodextrin-Based Liquid Crystals for Proton Conduction

et al. 2019

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Novel cyclodextrin (CD)-based amphiphilic poly(carboxylic acid)s that self-assemble into highly ordered smectic liquid crystalline mesophases were investigated as a novel class of protonic conductors. These structurally well-defined materials are synthesized from nontoxic and environment-friendly CDs, which possess a unique face-to-face pseudosymmetry. By taking advantage of such geometry, a series of flexible tetraethylene glycol groups terminated with a carboxylic acid functionality were introduced to the CD’s secondary face, resulting in the formation of long-range 2D hydrogen-bond networks in the smectic mesophases over a wide temperature window. This new material was found to exhibit impressive proton conductivities in solid states, up to 1.4 × 10–2 S cm–1 at 70 °C and 95% humidity. This constitutes the first report of amphiphilic CD-based liquid crystals applied as proton conductive materials.

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Supramolecular Liquid Crystals Based on Cyclodextrins

Cited by 4 publications

References 171 publications

Poly(l-Lactide) Liquid Crystals with Tailor-Made Properties Toward a Specific Nematic Mesophase Texture

Poly(l-Lactide) Liquid Crystals with Tailor-Made Properties Toward a Specific Nematic Mesophase Texture

Nematic-to-Isotropic Phase Transition in Poly(L-Lactide) with Addition of Cyclodextrin during Abiotic Degradation Study

Amphiphilic Cyclodextrin-Based Liquid Crystals for Proton Conduction

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