Birefringence Control of Photoalignable Liquid Crystalline Polymers Based on an<i>In Situ</i>Exchange of Oriented Mesogenic Side Groups

Sakai, Ayaka; Noshizono, Toshiki; Kondo, Mizuho; Sasaki, Tomoyuki; Sakamoto, Moritsugu; Ono, Hiroshi; Kawatsuki, Nobuhiro

doi:10.1246/cl.210617

Cited by 6 publications

(24 citation statements)

References 21 publications

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“…2-Hydroxy-4-methoxybenzaldehyde (HBA), 4-formyl-3 droxybenzoic acid (FHA) and 2-hydroxy-4-cyanobenzaldehyde (CNA) for in situ con sation were used as received. To improve the content of in situ functionalization of the photoaligned NBA-containing LCP films, we explored P3, which shows a sufficient photoinduced reorientation behavior [30]. Hydrolyzed P3 exhibits LC characteristics due to the presence of phenyl benzoate mesogenic moieties.…”

Section: Methodsmentioning

confidence: 99%

“…The C=N direction of P4 is opposite to that of P3. The chemical structure of P4 contains a mesogen with a phenylamine end group after the hydrolysis of NBA2 [30]. P4 exhibits LC characteristics similar to those of P3 [30].…”

Section: Thermal and Spectroscopic Properties Of P4mentioning

confidence: 99%

“…The chemical structure of P4 contains a mesogen with a phenylamine end group after the hydrolysis of NBA2 [30]. P4 exhibits LC characteristics similar to those of P3 [30]. P4 shows a high LC temperature range due to the long mesogenic side moieties compared with those of P1 and P2 [26].…”

Section: Thermal and Spectroscopic Properties Of P4mentioning

confidence: 99%

“…There the content of NBA in the copolymer is limited due to the non-LC characteristics a hydrolysis of NBA1 and 2 in the copolymer. To improve the content of in situ functionalization of the photoaligned NBA-cont ing LCP films, we explored P3, which shows a sufficient photoinduced reorientation havior [30]. Hydrolyzed P3 exhibits LC characteristics due to the presence of phenyl zoate mesogenic moieties.…”

Section: Introductionmentioning

confidence: 99%

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Photoinduced Reorientation and Polarized Fluorescence of a Photoalignable Liquid Crystalline Polymer

et al. 2022

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Thermally stimulated photoinduced reorientation of liquid crystalline (LC) polymethacrylate composed of a phenyl benzoate mesogen connected with N-benzylideneaniline (NBA2) end moiety exhibits a significant molecular reorientation (D > 0.7) when the film is exposed to linearly polarized 313 nm light and subsequently annealed in the LC temperature range of the material. Hydrolysis of the NBA2 end moieties yields an oriented mesogen with phenylamine moieties without distorting the oriented structure. In situ condensation of 2-hydroxybenzaldehyde derivatives and phenylamine moieties yields oriented N-salicylideneaniline side groups. The resultant film displays a polarized fluorescence with a polarization ratio up to 3.4.

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Section: Methodsmentioning

confidence: 99%

Section: Thermal and Spectroscopic Properties Of P4mentioning

confidence: 99%

Section: Thermal and Spectroscopic Properties Of P4mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Photoinduced Reorientation and Polarized Fluorescence of a Photoalignable Liquid Crystalline Polymer

et al. 2022

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“…Recently, we reported an NBA polymer with a high orientation, birefringence, and high heat resistance [35]. This polymer has the capability to replace components with higher birefringence while maintaining orientation [36]. However, its application as a PG material has not been investigated.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Polarization Grating on N-Benzylideneaniline Polymer Liquid Crystal and Control of Diffraction Beam

et al. 2022

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Photoresponsive photoalignable liquid crystalline polymers composed of phenyl benzoate terminated with N-benzylideneaniline were evaluated. These polymers are capable of axis-selective photoreaction, photoinduced orientation, and surface relief grating formation. Polarization holography using an He-Cd laser beam at a wavelength of 325 nm demonstrated the formation of a surface relief grating with a molecularly oriented structure based on periodic light-induced reorientation and molecular motion. Electrical switching of diffracted light using an electric field response of twisted-nematic cell containing a low-molecular-weight liquid crystal in combination was also demonstrated.

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Birefringence and Orientation Direction Control of Photoalignable Liquid Crystalline Copolymer Films Based on In Situ Modification of Mesogenic Groups

Uemura,

Nakajima,

Marui

et al. 2024

Langmuir

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Controlling the birefringence of optical films is imperative to fabricate thin birefringent optical devices. Here, new photoalignable liquid crystalline copolymers (PLCPs) with 4formylphneyl benzoate (PA) and cinnamic acid (CA) side groups are synthesized, which attain high photoreactivity and controllability of the orientation direction. Additionally, the exposed films are treated with 2-aminofluorene (AF) for an in situ condensation of PA with AF to form a Schiff base with a high inherent birefringence. Birefringence of the photoaligned film can be controlled up to 0.45 without disturbing the photoinduced orientation structure.

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Birefringence Control of Photoalignable Liquid Crystalline Polymers Based on anIn SituExchange of Oriented Mesogenic Side Groups

Cited by 6 publications

References 21 publications

Photoinduced Reorientation and Polarized Fluorescence of a Photoalignable Liquid Crystalline Polymer

Photoinduced Reorientation and Polarized Fluorescence of a Photoalignable Liquid Crystalline Polymer

Fabrication of Polarization Grating on N-Benzylideneaniline Polymer Liquid Crystal and Control of Diffraction Beam

Birefringence and Orientation Direction Control of Photoalignable Liquid Crystalline Copolymer Films Based on In Situ Modification of Mesogenic Groups

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