Free volume treatment of concentrated polymer solutions

Pezzin, G.; Gligo, N.

doi:10.1002/app.1966.070101103

Cited by 9 publications

(10 citation statements)

References 15 publications

(6 reference statements)

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“…The value of Me derived from the plot is 3-103 . It may be interesting to note that an Me value of 4 9 103 has been calculated for undiluted PVC from a study of the rheological properties of concentrated solutions of PVC in cyelohexanone (16).…”

Section: Discussionmentioning

confidence: 99%

Influence of molecular weight on some rheological properties of plasticized polyvinylchloride

1969

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Section: Discussionmentioning

confidence: 99%

Influence of molecular weight on some rheological properties of plasticized polyvinylchloride

1969

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“…The data refer to a single polymer sample of rather low molecular weight, 15,400, and to a single temperature, 79"C, which is well above the glass transition temperature of the pure polymer, -98°C (quoted in ref. (5)). The values of the polymer and solvent densities needed to calculate solution concentrations, were taken from the original paper (4).…”

Section: Poly(decamethy1ene Adipate)-diethylsuccinatementioning

confidence: 99%

“…The temperature range studied (20-100°C) is located above the glass transition temperature of the pure polymer (SOC, as quoted in ref. (5)).…”

Section: Corrcentrution Dependence Of Zero-shew Viscosity F O R Polymmentioning

confidence: 99%

“…Numerical viscosity data on this system, at 30"C, are given by Pezzirt and Gligo (18). Their measurements cover a limited range of concentration, but concern ten different molecular weight samples.…”

Section: Pol Yvin Ylchloride-c Yclohexanonementioning

confidence: 99%

“…The authors also checked volume additivity and showed that this approximation is reasonable for the system under study. In the present paper, solution concentrations were calculated from polymer weight fractions by using polymer and solvent densities given by the authors (18). The viscosity of the solvent used was also taken from the original paper.…”

Section: Pol Yvin Ylchloride-c Yclohexanonementioning

confidence: 99%

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Concentration dependence of zero‐shear viscosity for polymer solutions: A test of the lyons‐tobolsky equation

Rink

Pavan

Roccasalvo³

1978

Polymer Engineering & Sci

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The empirical equation proposed by Lyons and Tobolsky (1) to describe the concentration dependence of zero-shear viscosity in polymer solutions was tested on a variety of data taken from the literature, covering different polymer-solvent systems, molecular weight, temperature, and the whole concentration range. This equation was fitted to each set ofexperimental viscosity-concentration data by a least squares method. The validity of this equation is verified. The dependence of the optimal values obtained for the three parameters intrinsic viscosity, [q], Huggins constant, k, and new empirical constant, b, on moIecular weight, temperature, and solvent is aIso discussed. FITTING METHODqi is the experimental viscosity at concentrationci and N is the number of experimental determinations. The least The equation proposed by Lyons and Tobolsky reads: * We rrfer wily to zero-shear viscosity in this paper and will omit the notation "zero" throughout.

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Dielectric behavior of ethylcellulose in concentrated solutions

et al. 1980

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Measurements of dielectric relaxation were made for a series of solutions of ethylcellulose in benzene. The concentrations ranged from 0,s to 20 wt.-% and two polymers of different molecular weight were used. The dielectric dispersion was measured over the frequency range of 30 Hz -3 MHz at 30 -50 "C. The concentration dependence of the critical frequency below and above the critical concentration is interpreted by the free volume effect. It was found that the dielectric relaxation times are constant above the critical concentration and that the activation energy increases with concentration. The observed relaxation time is analyzed by Pri5hlich's theory assuming two limiting relaxation times. The lower limit in the relaxation time, r l , is concentration-independent above the critical concentration, in contrast to the upper relaxation time, r,, which depends on concentration. These relaxation times, r1 and r,, however, are interpreted by the same free volume effect. The unperturbed molecular dimension at the critical concentration is also discussed.

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Free volume treatment of concentrated polymer solutions

Cited by 9 publications

References 15 publications

Influence of molecular weight on some rheological properties of plasticized polyvinylchloride

Influence of molecular weight on some rheological properties of plasticized polyvinylchloride

Concentration dependence of zero‐shear viscosity for polymer solutions: A test of the lyons‐tobolsky equation

Dielectric behavior of ethylcellulose in concentrated solutions

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