Photoalignment Films of Polyesters with Photoreactive Main Chain. Photodimerization of 4-(4-(2-Carboxyvinylene)-phenylcarbonyloxy) cinnamate group.

Maeshima, Kei'ichi; Song, Sang Woo; Watabe, Mamoru; Tsushima, Hiroshi; Kawabata, Masami; Sumiyoshi, Iwao; Miyagawa, Nobukazu; Takahara, Shiro; Yamaoka, Tsuguo

doi:10.2494/photopolymer.12.249

Cited by 6 publications

(4 citation statements)

References 4 publications

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“…1. This photo-crosslinking reaction can form a crosslinked structure along one direction by irradiating a linearly polarized light [14], whereas the photo-dimerizations of cinnamoyl group have been known to induce uniaxial alignment of liquid crystals [15,16] and applied to the linear polarizer with dichroic dyes [17]. The photo-alignment by using PVA-SbQ is one of the methods arranging the polyiodine complex in the oriented PVA chain.…”

Section: Introductionmentioning

confidence: 99%

Formation Behavior of Polyiodine Complex in Photocrosslinked Polyvinyl Alcohol Fiber Spun by Electrospinning Method

Fujisawa

Yamamoto

Kashiwai

et al. 2018

J. Photopol. Sci. Technol.

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Fiber-oriented film was prepared by electrospinning method using polyvinyl alcohol with stylbazol quaternized group (PVA-SbQ), and the formation behavior of polyiodine complex in fibers was investigated. From the UV-vis spectra and the Raman spectra, it was revealed that PVA-I � � was formed in the fiber orientated film after staining. It is presumed that in the fiber oriented film, the iodine complexes are aligned in one direction. It is considered that the polyiodine complex is inductively arranged with respect to the orientation of fibers, which contributes to the development of dichroism.

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Section: Introductionmentioning

confidence: 99%

Formation Behavior of Polyiodine Complex in Photocrosslinked Polyvinyl Alcohol Fiber Spun by Electrospinning Method

Fujisawa

Yamamoto

Kashiwai

et al. 2018

J. Photopol. Sci. Technol.

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“…In association with the application of PVA–polyiodine complexes to polarizers, drawing has been the primary method to align these complexes in PVA films, whereas the physical anisotropy can also be given to photoreactive polymer films by the irradiation of polarized light. For example, the alignment of liquid crystals was able to be performed on the surfaces . Thus there is an expectation that PVA‐SbQ will photochemically form the polarized film of PVA–polyiodine complexes.…”

Section: Introductionmentioning

confidence: 99%

Formation and dichroism of poly(vinyl alcohol)–iodine complex in photocurable film

Takahara

Iwamura

Ema

et al. 2015

Polymers for Advanced Techs

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The formation of polyiodine complexes was investigated in a photocurable poly(vinyl alcohol) modified N-methyl-4 (4′-formylstyryl)pyridinium methosulfate acetal (PVA-SbQ), which is a photofunctional group that causes photodimerization. PVA-SbQ films with polyiodine complexes were prepared to be photocured, iodinated and soaked in a boric acid solution. The formation of PVA-polyiodine complexes was studied during iodinating and while in the boric acid treatment through UV-vis absorption spectrometry, resonance Raman spectrometry and IR absorption spectrometry. As a result, polyiodines were formed in the photocurable PVA-SbQ films, and the formation of PVA-polyiodine complexes was enhanced by boric acid treatment. It was found that the SbQ-ratio of PVA-SbQ affects the formation of PVA-polyiodine complexes. The photocrosslinking by the dimerization of SbQ groups helps to form the PVA-I 5 À complex during the boric acid treatment. Based on this effect, we demonstrated a unique recording method by the PVA-polyiodine complex formation. The PVA-SbQ film cured by the irradiation of the liner polarized light showed that dichroism of the PVA-polyiodine complexes formed after iodination.

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“…Among many promising photosensitive groups, the chalcone group has been well studied and can be used in photocrosslinkable polymers because it affords high sensitivity to UV radiation (λ = 300 -350 nm). The polymers containing a chalcone group in the side chain were also frequently studied for application to a LC photo-alignment layer [15][16][17]. The above polymers can be applied to a LC alignment layer only when using an angular selective [2+2] photodimerization process.…”

Section: Introductionmentioning

confidence: 99%

Polarized-Light-Induced Enhancement of the Electro-Optic Properties in a Photoreactive Maleimide Copolymer

Lee¹,

Cho²,

Jin³

et al. 2007

JKPS

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A photocrosslinkable maleimide copolymer has been synthesized using a tricyanopyrrolidene (TCP)-based chromophore.Theononitrile chromophore (DHATCP-CH) exhibits nonlinear optical activity and contains a chalcone moiety that is highly sensitive to UV light for crosslink formation. The maleimide monomer was also functionalized with chalcone moieties. The electro-optic signal can be varied under irradiation with linearly polarized light. The enhancement of the electro-optic effect in the copolymer is attributed to an angular selective photocrosslink formation upon illumination with p-polarized UV light. A possible mechanism that can explain this phenomenon is presented.

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Photoalignment Films of Polyesters with Photoreactive Main Chain. Photodimerization of 4-(4-(2-Carboxyvinylene)-phenylcarbonyloxy) cinnamate group.

Cited by 6 publications

References 4 publications

Formation Behavior of Polyiodine Complex in Photocrosslinked Polyvinyl Alcohol Fiber Spun by Electrospinning Method

Formation Behavior of Polyiodine Complex in Photocrosslinked Polyvinyl Alcohol Fiber Spun by Electrospinning Method

Formation and dichroism of poly(vinyl alcohol)–iodine complex in photocurable film

Polarized-Light-Induced Enhancement of the Electro-Optic Properties in a Photoreactive Maleimide Copolymer

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