Dipole Moment of Poly(ethylene oxide) in Solution and Its Dependence on Molecular Weight and Temperature

Yamaguchi, Noriko; Sato, Mutsuto

doi:10.1295/polymj.pj2008232

Cited by 27 publications

(23 citation statements)

References 28 publications

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“…Our observations need further and deeper understanding for developing a physical model. For example, the relationship between the dipole moments of the molecules used in our study (see, e.g., Yamaguchi and Sato [ 33 ]) and the observed changes in the conductivity is the subject of ongoing studies.…”

Section: Discussionmentioning

confidence: 99%

Electrical Conductivity of a Stretching Viscoelastic Filament

et al. 2021

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Long polymeric chains highly stretched and aligned with the flow confer a strong mechanical anisotropy on a viscoelastic solution. The electrically-driven transport of free ions under such conditions is far from being understood. In this paper, we determine experimentally whether the above-mentioned deviation from isotropy affects the electric charge transport across the liquid. To this end, we measure the electrical conductivity in the flow (stretching) direction of the cylindrical liquid filament formed in the elasto-capillary thinning that arises during the breakup of a viscoelastic liquid bridge. First, we examine the behavior of monodisperse solutions of polyethylene oxide (PEO) in a mixture of glycerine and water. For all the concentrations and molecular weights considered, the filament conductivity remains practically the same as the isotropic conductivity measured under hydrostatic conditions. However, we observe a decrease in the electric current at the end of elasto-capillary regime which may partially be attributed to the reduction of the liquid conductivity. Then, we measure the conductivity of bidisperse solutions of PEO with very different molecular weights. In this case, a significant decrease in conductivity is observed as the filament radius decreases. This constitutes the first experimental evidence of ion mobility reduction in stretching viscoelastic filaments, a relevant effect in applications such as electrospinning.

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Section: Discussionmentioning

confidence: 99%

Electrical Conductivity of a Stretching Viscoelastic Filament

et al. 2021

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“…On the other hand, the dipole moment of the linear PEG chain is known to increase with the chain length. 28,29 This trend has been explained to result from conformational isomerism about the single bonds of the individual ethylene glycol units. [30][31][32][33][34] The trans (anti)-gauche conformational arrangement about the C-C bond has an especially profound effect; the gauche conformation generates a larger dipole moment than that of the trans conformation, 35 so the large dipole moment of long PEG can be correlated to the enhanced gauche content in the polymer chains.…”

Section: Discussionmentioning

confidence: 99%

Unexpected electronic perturbation effects of simple PEG environments on the optical properties of small cadmium chalcogenide clusters

Fukunaga

Konishi

2015

Nanoscale

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Poly(ethylene glycol) (PEG) has been widely used for the surface protection of inorganic nanoobjects because of its virtually 'inert' nature, but little attention has been paid to its inherent electronic impacts on inorganic cores. Herein, we definitively show, through studies on optical properties of a series of PEG-modified Cd(10)Se(4)(SR)(10) clusters, that the surrounding PEG environments can electronically affect the properties of the inorganic core. For the clusters with PEG units directly attached to an inorganic core (R = (CH(2)CH(2)O)nOCH(3), 1-PEGn, n = 3, ∼7, ∼17, ∼46), the absorption bands, associated with the low-energy transitions, continuously blue-shifted with the increasing PEG chain length. The chain length dependencies were also observed in the photoluminescence properties, particularly in the excitation spectral profiles. By combining the spectral features of several PEG17-modified clusters (2-C(m)-PEG17 and 3) whose PEG and core units are separated by various alkyl chain-based spacers, it was demonstrated that sufficiently long PEG units, including PEG17 and PEG46, cause electronic perturbations in the cluster properties when they are arranged near the inorganic core. These unique effects of the long-PEG environments could be correlated with their large dipole moments, suggesting that the polarity of the proximal chemical environment is critical when affecting the electronic properties of the inorganic cluster core.

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“…Adachi's group utilized a liquid carbazole ( CBZ2 ) substituted with a poly(ethylene oxide) (PEO) chain (Figure f) as the emitting layer; it exhibited decreased driving voltage compared to its CBZ1 counterpart . This is because the lone pair of electrons on the oxygen atoms on the PEO chains creates a large dipole moment of the chains, which drives the orientation of CBZ1 at the interface between the electrodes and the emitting layer. As a result, electric double layers were formed on the surface of the electrodes, leading to improved carrier injection.…”

Section: Versatile Applications Of Lmlsmentioning

confidence: 99%

Solvent‐Free Luminous Molecular Liquids

Nakanishi

2019

Advanced Optical Materials

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Solvent‐free luminous molecular liquids (LMLs) are a new generation of soft matter which exhibit uncharged, nonvolatile, and fluidic nature and emit intense and homogeneous luminescence in the condensed state. They can be produced readily on the gram scale by modifying luminophores with bulky, flexible, and low‐melting side chains. Their performance can be facilely enriched by blending them with commercially available functional substances. Therefore, since their active optoelectronic properties were perceived a decade ago, LMLs have been regarded as promising contributing components in the burgeoning field of flexible and wearable light‐emitting devices. Recently, richer insights into LMLs have triggered various new applications. Additionally, unexpected phase behavior and photophysical properties have been discovered coincidentally. Therefore, the sensible and sophisticated molecular design principles of LMLs are still being augmented to guarantee predictable, steady, and consistent end‐use performance. This review summarizes the latest developments in LMLs, including molecular design principles, regulation and enrichment of their photophysical properties, and their versatile applications. Additionally, a prediction of the perspectives of LMLs in the near future is presented at the end.

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Dipole Moment of Poly(ethylene oxide) in Solution and Its Dependence on Molecular Weight and Temperature

Cited by 27 publications

References 28 publications

Electrical Conductivity of a Stretching Viscoelastic Filament

Electrical Conductivity of a Stretching Viscoelastic Filament

Unexpected electronic perturbation effects of simple PEG environments on the optical properties of small cadmium chalcogenide clusters

Solvent‐Free Luminous Molecular Liquids

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