Polymerization of Acetylene in Liquid Crystal Solvent

Araya, Kotaro; Mukoh, Akio; Narahara, Toshikazu; Shirakawa, Hideki

doi:10.1246/cl.1984.1141

Cited by 62 publications

(26 citation statements)

References 4 publications

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“…Synthesis of oriented polyacetylene in a nematic LC has been carried out [4]. In 1994, Goto firstly proposed an idea for production of LC chiral reaction field by addition of chiral compounds (chiral inducers or chiral dopant) to achiral nematic reaction field based on the previous research [5].…”

Section: Introductionmentioning

confidence: 99%

Sequential process of chiral imprinting and composite formation allows to produce electrooptically active poly(bis-EDOT)/hydroxypropyl cellulose

Yamabe

Goto

2018

Adv Compos Hybrid Mater

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Poly(3,4-ethylenedioxythiophene) (PEDOT) is one of the promising conjugated polymeric materials for organic devices such as organic solar cell or organic electroluminescence display. Hydroxypropyl cellulose (HPC) is a product of chemical-modified cellulose. HPC shows liquid crystal at appropriate condition in solvents. HPC has been used for a binder of medicines and can be applied for green sustainable chemistry in materials science. In this study, poly(bis-(3,4-ethylenedioxythiophene)), abbreviated as poly(bis-EDOT), film is prepared in cholesteric liquid crystals with electrochemical polymerization. We employ a dimer of EDOT (bis-EDOT) as a monomer because bis-EDOT shows good affinity with liquid crystals and the linear shape of bis-EDOT allows pre-orientation in liquid crystal prior to polymerization. The polymer film thus prepared in cholesteric liquid crystals (CLC) shows characteristic circular dichroism (CD) derived from 3-D asymmetric super structure. This study demonstrates that polymerization of the linear-shaped bis-EDOT can effectively imprint 3-D asymmetric structure from HPC as a polymer CLC matrix and form conductive polymer/non-conductive polymer composite.

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Section: Introductionmentioning

confidence: 99%

Sequential process of chiral imprinting and composite formation allows to produce electrooptically active poly(bis-EDOT)/hydroxypropyl cellulose

Yamabe

Goto

2018

Adv Compos Hybrid Mater

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“…[11][12][13] Polymerization of reactive mesogens (RMs) in LC phases has been widely explored for the stabilization of particular optical states, for the modification of electro-optical properties and for templating the orientational order of functional materials. [11][12][13][14][15][16][17][18] Much is known about templating the orientational order of LCs into polymer networks based on the photopolymerization of RMs in an orientationally ordered LC medium. The templated polymer networks exhibit both morphological and orientational anisotropy, mimicking those of the host LCs.…”

Section: Introductionmentioning

confidence: 99%

“…The templated polymer networks exhibit both morphological and orientational anisotropy, mimicking those of the host LCs. [11][12][13][14][15][16][17][18][19][20] However, in a majority of the systems investigated to date, the polymer networks are positionally disordered or ordering is imposed externally by manipulating the intensity distribution of reaction-initiating radiation. To manipulate the spatial distribution of polymer networks, lithographic and holographic techniques have been developed and refined by many researchers.…”

Section: Introductionmentioning

confidence: 99%

Optically and spatially templated polymer architectures formed by photopolymerization of reactive mesogens in periodically deformed liquid crystals

2017

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A unique and versatile method for forming optically (that is, orientationally) and spatially patterned polymer architectures was developed based on the photopolymerization of reactive mesogens (RMs) in a periodically deformed liquid crystal (LC). Without using lithographic or holographic implements, various polymer patterns were produced by employing nematic LCs as reaction solvents and spatially nonuniform electric fields. The nematic mixture, containing 5.0 wt.% RMs and sandwiched between patterned electrodes, was exposed to spatially uniform reaction-initiating radiation. The spatially nonuniform electric field induced periodic optical patterns in the reaction template with spatially varying elastic deformations. The resulting polymerized RM networks were both spatially and optically patterned, with good fidelity with respect to the electrode pattern and subsequent periodic director profiles. The spatial distribution of dense RM networks coincided precisely with the profile of highly deformed regions in the reaction medium. The optical birefringence of the polymer network was templated by the local director of the reaction template. Numerical calculations of director configuration and the associated elastic energy of the reaction template precisely matched the spatial and orientational order of polymerized RM networks. The proposed method provides ease and flexibility in forming organized polymer architectures for functional materials that require both positional and orientational order for their applications. NPG Asia Materials (2017) 9, e429; doi:10.1038/am.2017.151; published online 25 August 2017 INTRODUCTIONProcessing soft matter with various functionalities is critical for organic electronic and photonic applications. Soft materials provide conformational, processing and design advantages in effectively exploiting the desired properties of small molecules on longer length scales. 1,2 However, making functional materials is only the first step. To realize and optimize the performance of practical devices, patterning in one or more dimensions is frequently required to achieve both spatial distribution and orientational order in their collective assembly. [3][4][5][6][7][8] The materials' functionality and potential for application are severely compromised if they cannot be effectively processed using straightforward techniques.In this context, liquid crystals (LCs) have attracted great attention as a typical example of self-assembling soft materials with electronic and photonic functionalities. 7-10 Because of their mesomorphic behaviors, particularly their electrical and optical anisotropies with respect to dynamic fluidity, LCs have been intensively studied for several decades. LC-polymer composites in particular have been broadly investigated for electro-optical applications. 11-13 Polymerization of reactive mesogens (RMs) in LC phases has been widely explored for the stabilization of particular optical states, for the modification of electro-optical properties and for templating the orientational orde...

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“…Araya et al 6 developed a polymerization technique using an ordered molecular matrix consisting of a nematic liquid crystal (LC) as the solvent for the usual Ziegler-Natta catalyst. Orientation of the (CH), fibrils occurs during the polymerization and is determined by the orientation of the LC molecules.…”

Section: Introductionmentioning

confidence: 99%

Structural characterization of oriented polyacetylene films grown by the liquid crystal method

Coustel¹,

Foxonet²,

Ribet³

et al. 1991

Macromolecules

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We present a systematic study of the morphology of polyacetylene films, intrinsically oriented during the synthesis using the nematic phase of a liquid crystal as the Ziegler-Natta catalyst solvent. Orientation of the nematic phase, and hence the polymer, was achieved by gravitational flow combined with a vertical 4.7-T magnetic field. Using scanning electron microscopy, polarized Raman and infrared spectroscopies, and four-circle X-ray diffraction, we show that these films consist of distinct well-oriented and unoriented layers, the latter becoming more important for thicker films. Aging the catalyst at a higher temperature leads to a reduction in the polymerization rate and a decrease in the nonoriented fraction. n and p doping of the best films consistently produced parallel conductivities in the range 20 000 S/cm. We propose a model based on polymerization kinetics that explains the existence of different morphologies within a single "film".

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Polymerization of Acetylene in Liquid Crystal Solvent

Abstract: Highly oriented polyacetylene was synthesized using nematic liquid crystals as polymerization solvent

Cited by 62 publications

References 4 publications

Sequential process of chiral imprinting and composite formation allows to produce electrooptically active poly(bis-EDOT)/hydroxypropyl cellulose

Sequential process of chiral imprinting and composite formation allows to produce electrooptically active poly(bis-EDOT)/hydroxypropyl cellulose

Optically and spatially templated polymer architectures formed by photopolymerization of reactive mesogens in periodically deformed liquid crystals

Structural characterization of oriented polyacetylene films grown by the liquid crystal method

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