Synthesis of electro-optically active polymer composite of poly[2,2'-bis(3,4-ethylenedioxythiophene)-alt-fluorene]/hydroxypropyl cellulose showing liquid crystal structure

Eguchi, Naoto; Kawabata, Kohsuke; Goto, Hiromasa

doi:10.3144/expresspolymlett.2017.80

Cited by 4 publications

(6 citation statements)

References 11 publications

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“…The optical and scanning electron microscope observations of the obtained polymer films showed a liquid crystal-like texture, suggesting that the transcription of liquid crystal order occurred. The electrochemical polymerization of EDOT- alt -fluorene monomer in HPC liquid crystal was also attempted . HPC is a derivative of cellulose that is abundant in nature.…”

Section: Introductionmentioning

confidence: 62%

Electrochemical Synthesis of Poly(3,4-ethylenedioxythiophene) Film Having Dot Structures for Diffraction Grating

Eguchi

Goto

2019

ACS Appl. Mater. Interfaces

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Poly(3,4-ethylenedioxythiophene) (PEDOT) dot micro-/nanostructures are synthesized by electrochemical polymerization in a concentrated hydroxypropyl cellulose (HPC) liquid crystal electrolyte solution. Surface observations by scanning electron microscopy and atomic force microscopy reveal micro-/nanostructures having hemisphere-like dots on the surface of the PEDOT film, which causes light diffraction at ultraviolet and visible light wavelengths. The size of the dots depends on the concentration of the HPC electrolyte solution, decreasing with increasing the HPC concentration. Electrochemical oxidation and reduction causes changes in the color of the PEDOT film and the diffracted light. Moreover, Au coating on the surface of the PEDOT film enhances the diffracted light reflection intensity by more than tenfold compared to the non-coated PEDOT film.

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Section: Introductionmentioning

confidence: 62%

Electrochemical Synthesis of Poly(3,4-ethylenedioxythiophene) Film Having Dot Structures for Diffraction Grating

Eguchi

Goto

2019

ACS Appl. Mater. Interfaces

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“…Among these materials, the CLC, which has a helical pitch, shows exceptional performance in optical physics. Because the unique helical structure has periodic characteristics, it can selectively reflect circularly polarized light according to Bragg's law 29–33 . The light reflection from a cholesteric helical structure is more complex than that from a crystal lattice, resulting in a more pronounced and obvious color change.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of imprinted photonic films via predesigned multiple UV‐polymerizations and their ability to detect solvents and metal ions in aqueous solution

Hung

Liu

Chang

et al. 2021

J of Applied Polymer Sci

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To synthesize photonic films without a chiral dopant, a predesigned multiple photopolymerization process was carried out. The photonic films were prepared by the photopolymerization of a mixture of chiral nematic liquid crystals. After polymerization, the chiral dopant, CB15, was removed and recycled. The imprinted photonic polymer films showed Bragg reflection without the presence of the chiral dopant. Upon the sensing of solvents in aqueous solution, significant color changes and peak shifts were observed by the naked eye and ultraviolet–visible spectroscopy, respectively. A linear calibration curve between the central wavelength of the reflection band of the fabricated imprinting film and the volume ratio of 1,4‐dioxane in water was observed. Furthermore, the sensing of chloroform content in methanol, ethanol, and acetone via the imprinted film were also investigated. The results suggest that the synthesized imprinted photonic films can detect different kinds of mixed solvents. The sensing properties of the photonic films were further improved by copolymerization with a rhodamine‐derived monomer. The synthesized modified photonic films can detect heavy metal ions in aqueous solution. This study reports a novel, recyclable, and easy approach to detect organic solvents and copper ions in aqueous solution.

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“…In previous studies, HPC liquid crystals were used as an electrolyte solution and chiral template for producing the optically active polymer, poly(2,2′‐bis(3,4‐ethylenedioxythiophene)‐ alt ‐fluorene) (poly(E‐Flu)), which is known to possess excellent electrochromic properties. [ 45 ] Optical activity, derived from the chiral order transcription from HPC to the poly(E‐Flu) film, was confirmed by circular dichroism spectra (CD). However, details on the spectroscopic and electrochemical redox properties, as well as the nature of the relationship between the optical activity and the polarons (radical cations) which are charge career of the conjugated polymers, are still unknown.…”

Section: Introductionmentioning

confidence: 99%

Relationship between polarons and optical activity for conductive polymer/hydroxypropyl cellulose composite

Eguchi

Goto

2020

Journal of Polymer Science

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A chiroptical conjugated polymer, poly(2,2′‐bis[3,4‐ethylenedioxythiophene]‐alt‐fluorene) (poly[E‐Flu]), was synthesized by electrochemical polymerization in a hydroxypropyl cellulose (HPC) based cholesteric liquid crystal (CLC) electrolyte solution. Subsequent poly(E‐Flu) characterization was conducted using polarizing optical microscopy and atomic force microscopy, as well as electrochemical, spectroscopic, and electron spin resonance (ESR) measurements. Surface observations reveal that the poly(E‐Flu) film has a fingerprint texture, which is typical optical textures of CLCs exposed to cross‐polarization. Fingerprint texture of poly(E‐Flu) indicates that the transcription of the CLC helical structure from the CLC electrolyte solution to the conjugated polymer has occurred during the electrochemical polymerization reaction. Optical rotation dispersity and circular dichroism (CD) spectra indicated that poly(E‐Flu) is optically active and that its optical activity is reversibly changed in the electrochemical redox processes.

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Synthesis of electro-optically active polymer composite of poly[2,2'-bis(3,4-ethylenedioxythiophene)-alt-fluorene]/hydroxypropyl cellulose showing liquid crystal structure

Cited by 4 publications

References 11 publications

Electrochemical Synthesis of Poly(3,4-ethylenedioxythiophene) Film Having Dot Structures for Diffraction Grating

Electrochemical Synthesis of Poly(3,4-ethylenedioxythiophene) Film Having Dot Structures for Diffraction Grating

Fabrication of imprinted photonic films via predesigned multiple UV‐polymerizations and their ability to detect solvents and metal ions in aqueous solution

Relationship between polarons and optical activity for conductive polymer/hydroxypropyl cellulose composite

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