Fused state 13C-NMR study on liquid crystalline polyacetylene derivatives — magnetically forced alignment and orientational behavior

Akagi, Kazuo; Goto, Ryota; Shirakawa, Hideki; Nishizawa, Tsutomu; Masuda, Kaoru

doi:10.1016/0379-6779(94)02351-x

Cited by 21 publications

(9 citation statements)

References 1 publication

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“…Especially in the field of polyacetylenes, only a few research groups have dealt with the these issues. The synthesis of linear polyacetylene with cholesteryl and aromatic − side groups and the synthesis of liquid-crystalline polyheptadiynes − has been described by essentially three different groups, but conclusions concerning the role of the spacer and main-chain rigidity on the phase behavior have been drawn from incomplete homologous series. Such extrapolations may have underestimated small but substantial aspects concerning the influence of these structural parameters on mesophase behavior.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Thermal and Morphological Behavior of Liquid-Crystalline Acetylene Homo- and Copolymers

et al. 1998

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The thermal and morphological behavior of the first complete homologous series of liquidcrystalline polyacetylene derivatives has been investigated by means of X-ray diffraction, differential scanning calorimetry, thermogravimetry, and polarizing optical microscopy. The influence of the spacer length on the thermal behavior and on the structure of the mesophases is discussed. All polymers except one form smectic monolayers at room temperature. For one spacer length, the formation of bilayers is observed. Despite the connection of the mesogens to the stiff, conjugated polymer main chain, most polymers exhibit highly ordered mesophases. Copolymerization of the mesogen-containing monomers with 1-octyne leads to a decrease of the supramolecular order with an increasing amount of comonomer in the polymer and finally to the formation of a new phase.

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Section: Introductionmentioning

confidence: 99%

Investigation of the Thermal and Morphological Behavior of Liquid-Crystalline Acetylene Homo- and Copolymers

et al. 1998

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“…As the macroscopic alignment was first achieved under magnetic force field, 25 it is straightforward to study many kinds of LC-substituted PA derivatives. 23,[26][27][28][29][30][31][32] However, the electrical conductivity of LC-substituted PA is significantly lower than that of non-substituted PA. This is due to a lower coplanarity of the main chain, which arises from steric repulsion between substituents, a higher ionisation potential, and a lower electron affinity.…”

Section: Introductionmentioning

confidence: 99%

From helical polyacetylene to helical graphite: synthesis in the chiral nematic liquid crystal field and morphology-retaining carbonisation

2010

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This tutorial review presents current progress in the synthesis of helical polyacetylene (H-PA) using a chiral nematic liquid crystal reaction field as an asymmetric polymerisation solvent. In addition, we review the morphology-retaining carbonisation for helical graphite using H-PA as a carbonisation precursor. Carbonisation of H-PA films, via iodine doping, is demonstrated to produce carbon and graphitic films bearing completely preserved morphologies and even helical nanofibril structures.

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“…On the other hand, conjugated polymers are quintessential materials for the “plastic electronics” revolution and have been extensively studied for their potential applications in light‐emitting diodes, electrochemical cells, field effect transistors, lasers, and photovoltaic cells 4–9. Combination the anisotropic properties of liquid crystals with conjugated polymers properties may endow liquid‐crystalline conjugated polymers (LCCPs) with unique applications and stimulate technological innovations in the development of novel electronic and photonic devices, and enable us to control electrical and optical properties as well as their anisotropies10–12. Indeed, LCCPs have been found, for example, to exhibit linearly13 or circularly polarized emission4 and have been utilized to impart new features to electrochromism 14.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Photoluminescence, Mesomorphism and Conformation of Liquid‐Crystalline Conjugated Polymers with Terphenyl Mesogen Pendants

Chen

Zhou

et al. 2010

Macro Chemistry & Physics

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A variety of LCCPs containing terphenyl pendants based on polyacetylene, polythiophene, poly(p‐phenylene) and a poly(p‐phenylene) copolymer backbone have been synthesized. The effects of the structural variation on their properties, especially their mesomorphism, photoluminescence and secondary structures, were studied systematically. Longer alkoxy spacer favor stronger light emission and better mesomorphism. Disubstituted polyacetylenes show better developed mesomorphic textures, higher quantum yields and better thermal stability than their corresponding monosubstituted analogs. Steric effects and the “jacket‐ effect” from the mesogens cause the bulky terphenyl mesogen pendants to rotate around the main chain and force the main chain to assume a spiral conformation along the main chain in long range.

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Fused state 13C-NMR study on liquid crystalline polyacetylene derivatives — magnetically forced alignment and orientational behavior

Cited by 21 publications

References 1 publication

Investigation of the Thermal and Morphological Behavior of Liquid-Crystalline Acetylene Homo- and Copolymers

Investigation of the Thermal and Morphological Behavior of Liquid-Crystalline Acetylene Homo- and Copolymers

From helical polyacetylene to helical graphite: synthesis in the chiral nematic liquid crystal field and morphology-retaining carbonisation

Enhanced Photoluminescence, Mesomorphism and Conformation of Liquid‐Crystalline Conjugated Polymers with Terphenyl Mesogen Pendants

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