Measurement of the Dielectric Constant of Cellulose

Luca, H. A. De; Campbell, W. Boyd; Maass, O.

doi:10.1139/cjr38b-037

Cited by 23 publications

(14 citation statements)

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“…Thus we have b c FIGURE 7.-Distribution of components for formula (7). The values of F computed by means of formula 8, using the data in table 1, are given in table 2.…”

Section: Resultsmentioning

confidence: 99%

“…The dielectric constant of the powder is the same as that of the liquid when the dielectric constant of the mixture of powder and liquids is the same as that of the liquid mixture alone. Some of the more recent descriptions of this method are given by Luca, Campbell, and Maass [7], Whitehead and Hackett [8], Cheng [9], and Wachholtz and Franceson [10]. Actually, the liquid mixture having a dielectric constant exactly that of the calcium carbonate was not prepared, as this would have been too tedious.…”

Section: Dielectric Constant Of Calcium Carbonatementioning

confidence: 99%

See 1 more Smart Citation

Dielectric constant, power factor, and conductivity of the system rubber-calcium carbonate

Scott¹,

McPherson²

1942

J. RES. NATL. BUR. STAN.

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The dielectric constants and power factors of mixtures of calcium carbonate with Vistanex and with natural rubber were determined at 1 and 100 kilocycles per second. There was little difference between the values at the two frequenciel'. Two different formulas were found to express the dielectric constants of the mixtures as functions of the dielectric constants of the respective components. The dielectric constant of the pure calcium carbonate employed was determined by the method of liquid mixtures. The power factors of the rubber-calcium carbonate mixtures were intermediate between those of the components. The conductivities of the Vistanex-calcium carbonate mixtures measured at the end of 1 minute of electrification were intermediate between those of the components, but the conductivities of the mixtures of natural rubber and calcium carbonate seemed to go through a minimum. CONTENTS Page

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“…Thus we have b c FIGURE 7.-Distribution of components for formula (7). The values of F computed by means of formula 8, using the data in table 1, are given in table 2.…”

Section: Resultsmentioning

confidence: 99%

Section: Dielectric Constant Of Calcium Carbonatementioning

confidence: 99%

Dielectric constant, power factor, and conductivity of the system rubber-calcium carbonate

Scott¹,

McPherson²

1942

J. RES. NATL. BUR. STAN.

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“…It may be noted that that the dielectric constant of cellulose is 5 [37] which is nearly the same as that of PVDF (13 to 17) [38,39]. Thus, the combined effect of dielectric property of the cellulose-PVDF matrix would not change significantly with the relative variation of PVDF:Cellulose concentration and as such the host matrix may behave as a homogeneous medium to the filler.…”

Section: Dielectric and Impedance Behaviormentioning

confidence: 99%

CdS impregnated cellulose nanocrystals/PVDF composite flexible and freestanding films: Impedance spectroscopic studies

Das

Bhunia

Das

et al. 2017

Polymer Engineering & Sci

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Nanocrystalline CdS impregnated cellulose nanocrystals (CdS‐Cellulose) were embedded in polyvinylidene fluoride (PVDF) matrix and free‐standing flexible films of CdS‐cellulose/PVDF nanocomposite were made by sol‐gel technique. Effect of CdS loadings in cellulose embedded in the host matrix (PVDF) on the impedance properties was studied critically for the above samples. Dielectric constants were studied as a function of frequencies (1–100 kHz) at room temperatures. The dielectric constant increased significantly in CdS‐cellulose/PVDF nanocomposite than that for pristine PVDF film. The higher values of dielectric constant as well as dielectric loss were obtained at lower frequencies. This may be caused due to contributions arising out of space charge, dipole, and electronic polarizations. At higher frequencies, only dipole and electronic polarization were seen to contribute significantly. The nature of the Cole‐Cole plots could be seen to deviate significantly from one impedance semicircular arc before diverging after a frequency of 3,158, 2,147, and 1,925 Hz for CdS‐cellulose/PVDF nanocomposite with increased loading of CdS. POLYM. ENG. SCI., 58:1419–1427, 2018. © 2017 Society of Plastics Engineers

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“…A commonly accepted dielectric constant of PEO is ϵ PEO ∼ 8. If the polymer (PEO) is then replaced by a lower-dielectric species, such as cellulose (ϵ cell = 2–8 − ), then Δϵ becomes larger. Thus, our theory predicts further shifts in the critical point toward polymer-rich regions.…”

Section: Hydrogen Bonding and Dielectric Inhomogeneitymentioning

confidence: 99%

Spinodal Decomposition of a Polymer and Ionic Liquid Mixture: Effects of Electrostatic Interactions and Hydrogen Bonds on Phase Instability

Nakamura

2016

Macromolecules

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We studied the spinodal decomposition of a homopolymer and ionic liquid mixture. Our theory accounts for the dielectric contrast and hydrogen bond between the polymer and the ionic liquid and the effect of fluctuations in the local density and electrostatic potential. We attempted to rationalize the observed shift in the critical point and the asymmetry of the observed spinodal curve by applying the selfconsistent field theory and Langmuir adsorption model. The dielectric contrast between the polymer and the ionic liquid produces a shift in the critical point toward polymer-rich regions. The fluctuation effect yields drastic changes in the trend of the phase boundary. We show that both effects are marked by the appearance of inflection points in the spinodal curve. Although hydrogen bonding also yields similar effects, the spinodal curve rather exhibits a double-well structure or relatively flat structure when combined with the solvation energy of ions. Hydrogen bonding, ion solvation, and the fluctuation have equal significance on the magnitude and trend of the spinodal curve. Our theory provides strategies to dissolve low-dielectric polymers in ionic liquids by altering the dielectric constant of ionic liquids and employing hydrogen bonding.

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Measurement of the Dielectric Constant of Cellulose

Cited by 23 publications

References 0 publications

Dielectric constant, power factor, and conductivity of the system rubber-calcium carbonate

Dielectric constant, power factor, and conductivity of the system rubber-calcium carbonate

CdS impregnated cellulose nanocrystals/PVDF composite flexible and freestanding films: Impedance spectroscopic studies

Spinodal Decomposition of a Polymer and Ionic Liquid Mixture: Effects of Electrostatic Interactions and Hydrogen Bonds on Phase Instability

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