Exploration of immobilization conditions of cellulosic lyotropic liquid crystals in monomeric solvents by <i>in situ</i> polymerization and achievement of dual mechanochromism at room temperature

Miyagi, Kazuma; Teramoto, Yoshikuni

doi:10.1039/c8ra04878a

Cited by 10 publications

(9 citation statements)

References 35 publications

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“…Once a cholesteric liquid crystalline phase has developed, the spacing between each plane of the helicoidal arrangement is dependent on the fraction of polymer in the mesophase. Generally, a higher concentration leads to a smaller pitch and a blue-shift of the reflection spectrum of the chains as more closely packed. ,,,,,− ,,,,,,,, Specifically, a power law dependence between the pitch p (units of μm) and concentration ϕ p (units of wt %) is repeatedly reported like in eq . ,, …”

Section: Cholesteric Solutions Of Cellulose Derivativesmentioning

confidence: 93%

Unraveling the Governing Mechanisms Behind the Chiral Nematic Self-Assembly of Cellulose-Based Polymers

Fine,

Chazot

2023

Chem. Mater.

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Thanks to their abundance and ability to selfassemble into photonic crystals that selectively reflect light, chiral nematic liquid crystalline cellulose polymers have been investigated as the basis for colorimetric sensors responsive to humidity, pressure, temperature, and other stimuli. In this perspective, we start by revisiting the early research on these materials to explain how different geometric and thermodynamic factors influence the self-assembly and optical properties of cholesteric phases constructed from cellulose derivatives. We explore how solubility, viscosity, and hydrogen bonding impact the onset of mesophase formation and the helicoidal arrangement. Having elucidated the controlling factors influencing the pitch−concentration relationship in these materials, we discuss efforts to preserve liquid crystalline order in solids and underscore the critical knowledge gaps in understanding how the kinetics of self-assembly affects both cholesteric order formation and retention.

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Section: Cholesteric Solutions Of Cellulose Derivativesmentioning

confidence: 93%

Unraveling the Governing Mechanisms Behind the Chiral Nematic Self-Assembly of Cellulose-Based Polymers

Fine,

Chazot

2023

Chem. Mater.

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“…In prior work EC/PAA films expressed SICDI only above 130 • C because of the T g of the films. Thus Miyagi and Teramoto [57][58][59] also expanded the conditions where such films can manifest SICDI. Accordingly, they prepared propionylated HPC (PHPC; Figure 2k), which has a low T g (ca.…”

Section: Mechanochromic Filmsmentioning

confidence: 96%

“…Fukawa et al [60] reported a similar phenomenon. Spin-lattice relaxation analyses of PHPC/synthetic polymer ChLC films by solid-state nuclear magnetic resonance spectroscopy indicated that the immobilization efficiency was high for the films where PHPC and synthetic polymers were not completely compatible [57,58]. This can be attributed to the way that the complete mixing of cellulose derivatives and synthetic polymers disturbs the interaction of mesogenic cellulosic chains.…”

Section: Mechanochromic Filmsmentioning

confidence: 99%

Construction of Functional Materials in Various Material Forms from Cellulosic Cholesteric Liquid Crystals

Miyagi

Teramoto

2021

Nanomaterials

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Wide use of bio-based polymers could play a key role in facilitating a more sustainable society because such polymers are renewable and ecofriendly. Cellulose is a representative bio-based polymer and has been used in various materials. To further expand the application of cellulose, it is crucial to develop functional materials utilizing cellulosic physicochemical properties that are acknowledged but insufficiently applied. Cellulose derivatives and cellulose nanocrystals exhibit a cholesteric liquid crystal (ChLC) property based on rigidity and chirality, and this property is promising for constructing next-generation functional materials. The form of such materials is an important factor because material form is closely related with function. To date, researchers have reported cellulosic ChLC materials with a wide range of material forms—such as films, gels, mesoporous materials, and emulsions—for diverse functions. We first briefly review the fundamental aspects of cellulosic ChLCs. Then we comprehensively review research on cellulosic ChLC functional materials in terms of their material forms. Thus, this review provides insights into the creation of novel cellulosic ChLC functional materials based on material form designed toward the expanded application of cellulosics.

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“…In our previous studies, we prepared cellulosic/polymer ChLC composite films by in situ polymerization of the corresponding cellulosic/monomer lyotropic ChLC. The obtained ChLC composites showed not only color change but also CD inversion by applying compressive stress. − Furthermore, the compressed films recovered their original CD by thermal treatment. As far as we know, there have been no other reports that specifically focus on stress-induced dynamic CD inversion of solid ChLC materials.…”

Section: Introductionmentioning

confidence: 95%

Elucidation of the Mechanism of Stress-Induced Circular Dichroic Inversion of Cellulosic/Polymer Liquid Crystalline Composites

Miyagi

Teramoto

2020

Macromolecules

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We revealed the mechanism of circular dichroic inversion of cellulosic/polymer cholesteric liquid crystalline (ChLC) composites induced by applying compressive stress through a modeling approach. We examined the circular dichroic behavior of a simple system, which is a ChLC composite superimposed with compressed non-ChLC composite, to avoid structural change in ChLC. Theoretical circular dichroism spectra of the superimposed composites were calculated from the model based on the birefringence of the compressed sample and showed good agreement with experimental spectra. Hence, the stress-induced circular dichroic inversion was found to be caused by the linear orientation of component polymers of composites due to compression. Recovery of original circular dichroism by thermal treatment was also explained in terms of the relaxation of the linearly oriented component polymers.

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Exploration of immobilization conditions of cellulosic lyotropic liquid crystals in monomeric solvents by in situ polymerization and achievement of dual mechanochromism at room temperature

Abstract: We obtained cellulosic/synthetic polymer composites incorporating a cholesteric liquid crystalline structure by in situ polymerization and accomplished dual mechanochromism at room temperature.

Cited by 10 publications

References 35 publications

Unraveling the Governing Mechanisms Behind the Chiral Nematic Self-Assembly of Cellulose-Based Polymers

Unraveling the Governing Mechanisms Behind the Chiral Nematic Self-Assembly of Cellulose-Based Polymers

Construction of Functional Materials in Various Material Forms from Cellulosic Cholesteric Liquid Crystals

Elucidation of the Mechanism of Stress-Induced Circular Dichroic Inversion of Cellulosic/Polymer Liquid Crystalline Composites

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