Is chemical crosslinking necessary for the photoinduced bending of polymer films?

Mamiya, Jun‐ichi; Yoshitake, Akira; Kondo, Mizuho; Yu, Yanlei; Ikeda, Tomiki

doi:10.1039/b715855f

Cited by 103 publications

(103 citation statements)

References 29 publications

(2 reference statements)

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“…These are considered as the beginning of systematical investigation in this field. Among the hydrogen-bond units, pyridyl and carboxylic acid groups are often used as hydrogen-bond acceptors and donors for fabrication of SLCP powders, [9] submicrofibers, [10] free-standing films, [11] etc. Till now, there are no reports about fabrication and properties of SLCP microparticles.…”

Section: Introductionmentioning

confidence: 99%

Easy Fabrication and Morphology Control of Supramolecular Liquid‐Crystalline Polymer Microparticles

Liu

Kobayashi

2010

Macromol. Rapid Commun.

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A novel kind of supramolecular liquid-crystalline polymer (SLCP) microparticles was successfully fabricated with an azopyridyl polymer and sebacic acid by combining a simple self-organized precipitation method with hydrogen bonding interactions. Upon slow evaporation of a mixed solution of a volatile good solvent and a nonvolatile poor one, walnutlike microparticles showing wrinkled surfaces and LC natures were obtained. The diacid might play a crucial role in the formation of SLCP particles. Without addition of the diacid, neither wrinkled surfaces nor LC natures were observed in azopyridyl polymer microparticles. The fabricated SLCP microparticle possessed not only photoresponsive properties (due to azopyridyl groups) but also LC ordering, which might enable them to find advanced applications.

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Section: Introductionmentioning

confidence: 99%

Easy Fabrication and Morphology Control of Supramolecular Liquid‐Crystalline Polymer Microparticles

Liu

Kobayashi

2010

Macromol. Rapid Commun.

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“…96 On the basis of the supramolecular design described above, functional supramolecular LC polymers have been developed ( Figure 6). 51,[97][98][99][100][101][102][103][104][105] Ferroelectricity can be induced for hydrogenbonded LC polymer 15 exhibiting chiral smectic C phases. 51 Chiral hydrogen-bond acceptors are used to form supramolecular LC polymers that show spontaneous polarization.…”

Section: Supramolecular Design Of Lc Polymersmentioning

confidence: 99%

“…99 Photo-responsive materials were developed based on azobenzene-containing LC supramolecular polymer networks. 100 Supramolecular LC polymers have been applied for ion-and electron-conductive materials. [101][102][103][104][105] Ikkala and co-workers described the development of nanostructured proton-conductive polymers combining hydrogen bonds and ionic interactions.…”

Section: Supramolecular Design Of Lc Polymersmentioning

confidence: 99%

“…Ikeda also explored the use of hydrogen-bonding interactions to cross-link LC polymers containing azobenzene groups. 100 These materials 41 were prepared by mixing a side-chain LC polymer containing azobenzene and benzoic acid groups with bispyridyl derivatives (Figure 13b). Bispyridyl groups act as supramolecular crosslinkers between the side carboxylate groups 50,67 of the polymers.…”

Section: Functional Lc Polymers and Networkmentioning

confidence: 99%

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Functional liquid-crystalline polymers and supramolecular liquid crystals

Kato

Uchida

Ichikawa

et al. 2017

Polym J

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The design and functions of liquid-crystalline (LC) polymers with classifying them into conventional-, supramolecular-, dendriticand network-type LC polymers are described. LC polymers show new functions as new devices in the field of energy and environment by incorporating mesogenic moieties exhibiting photonic, electronic and ionic functions. Supramolecular LC polymers show dynamic and unique properties because the mesogenic moieties are built with non-covalent interactions. Dendritic-type LC polymers exhibit liquid crystallinity by nanosegregation of aromatic and aliphatic moieties. Dendritic fork-like mesogens have also been prepared. A variety of nonmesogeic functional building blocks including fullerene, π-conjugated moieties, catenane, rotaxane and others can be incorporated into LC phases by attaching these dendritic moieties. LC networks are constructed in situ polymerization of polymerizable nematic or nanostructured liquid crystals. The specific characteristics of the LC networks have generated new research trends to develop well-defined polymers that exhibit optical, transport and separation properties. In these materials, through suitable design of LC monomers, the preservation of smectic, columnar and bicontinuous cubic phases has been successfully used for the development of membranes with one-dimensional, two-dimensional and three-dimensional nanostructures.

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“…[24][25][26][27][28][29], where different secondary bonds might be another answer, including hydrogen bond, π-π interaction, coordination linkage, and so on. For example, Ikeda et al [30] prepared azo based liquid crystalline films using hydrogen bond as crosslinking points, obtaining the reversible bending/unbending properties under UV/visible light as well. Zhang et al [31] synthesized azobenzene main-chain LCPs via Michael addition polymerization and then studied the photomechanical effects of their supramolecular hydrogen-bonded fibers.…”

Section: Introductionmentioning

confidence: 99%

Physio- and chemo-dual crosslinking toward thermoand photo-response of azobenzene-containing liquid crystalline polyester

et al. 2018

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Combining the stability of chemical crosslinking and the processability of physical crosslinking is a well-established strategy to design new materials with desirable stimuli-responsive properties. Herein, a series of azobenzenebased thermotropic liquid crystalline polyesters were synthesized by introducing mesogenic dial named 4,4ʹ-bis(6-hydroxyhexyloxy)azobenzene (BHHAB), 2-phenylsuccinic acid (PSA), and different contents of 1,2,3-propanetricarboxylic acid (PTA) as the chemical crosslinker. All these polyesters showed good thermal stability and smectic liquid crystalline phase. Wide-angel X-ray diffraction (WAXD) and the fluorescence emission spectra confirmed the existence of π-π stacking interactions as the physical crosslinking in the polymer chains, particularly at the lower content of PTA. However, when the PTA content increased, the chemical crosslinking changed the chain conformation, and thus the intensity of physical crosslinking slackened gradually. Combining the physical and chemical crosslinking, these polyesters showed the thermoplastic processability, thermal shape memory, heat-assisted healing and photoresponsive behaviors. Taking advantages of these features, these multiple stimuli-responsive polymers can bring more chances for smart materials such as soft actuator.

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Is chemical crosslinking necessary for the photoinduced bending of polymer films?

Cited by 103 publications

References 29 publications

Easy Fabrication and Morphology Control of Supramolecular Liquid‐Crystalline Polymer Microparticles

Easy Fabrication and Morphology Control of Supramolecular Liquid‐Crystalline Polymer Microparticles

Functional liquid-crystalline polymers and supramolecular liquid crystals

Physio- and chemo-dual crosslinking toward thermoand photo-response of azobenzene-containing liquid crystalline polyester

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