Zur Charakterisierung fraktionierter Polyvinylalkohole

Dialer, K.; Vogler, K.; Patat, F.

doi:10.1002/hlca.19520350329

Cited by 47 publications

(7 citation statements)

References 28 publications

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“…A comparison of equations (15) and (16) shows that we have generally in those cases where the parameters A, and dh had been previously determined from diffusion and sedimentation experiments:…”

Section: Measurements Of the Diffusion Constantmentioning

confidence: 85%

“…D = (l/Z)(l.l + 0.262"') X low5 (23) By comparing this equation with (16) we find: 15 x cm., k = 1.38 X lO-laerg/degree, and T = 293'K. ; yields the following results for the parameters A , and dh: A , = 87 X cm.…”

Section: Measurements Of the Diffusion Constantmentioning

confidence: 99%

“…In the actual case of polymer solutions, D is determined experimentally, and A , and dh are calculated from the experimental results. It is now seen that, if the correct equation (16) is used instead of (15), different values of A , and dh will result from experimental D values. By the assignment of wrong p values (according to eq.…”

Section: Viscosity and Streaming Birefringence Of Polymer Solutionsmentioning

confidence: 99%

“…and A , (viscosity) = 92 X Similar results were found also in the case of polyvinyl alcohol in water in a recent experimental investigation by Dialer, Vogler, and Patat. 15 The dzusion constant, according to these measurements, is given by: cm. and d, = 7 X cm., diverge widely from each other.…”

Section: If As Was Done Subsequently In Sedimentation Experiments Bymentioning

confidence: 99%

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Improved relationships for diffusion and sedimentation constants and for viscosity and streaming birefringence of solutions of polymers

1954

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For the description of the practical properties of a large number of linear polymer molecules as well as for the discussion of the various mean parameters of the individual chain molecule, the model usually employed to represent the molecule consists of N m straight line chain elements of length A m statistically joined to each other (straight element model). For the construction of large‐scale wire models of polymer molecules to be used in model experiments on the hydrodynamic behavior of chain molecules, a somewhat different model (circular segment model) was employed in previous papers. In these papers the relationships connecting the parameters which characterize these two models respectively have been determined on the basis of certain assumptions. These assumptions, as has recently been shown, were however partly in error and certain corrections have now to be applied to the numerical constants which appear in previously published formulas for the diffusion and sedimentation constants and for the intrinsic viscosity and streaming birefringence. The formulas, resulting after these corrections have been incorporated, are compiled in the present paper and the effect of these corrections on the interpretation of both new and old experimental results is discussed. It is found that agreement between theory and experiment is improved by the use of the corrected expressions and that in particular certain discrepancies which had previously existed between the lengths A m of the statistical chain element as calculated from sedimentation and diffusion experiments, on the one hand, and viscosity determinations on the other, disappear after these corrections are applied (see Table I).

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Section: Measurements Of the Diffusion Constantmentioning

confidence: 85%

Section: Measurements Of the Diffusion Constantmentioning

confidence: 99%

Section: Viscosity and Streaming Birefringence Of Polymer Solutionsmentioning

confidence: 99%

Section: If As Was Done Subsequently In Sedimentation Experiments Bymentioning

confidence: 99%

See 2 more Smart Citations

Improved relationships for diffusion and sedimentation constants and for viscosity and streaming birefringence of solutions of polymers

1954

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“…Therefore, all sedimentation, viscosity, and 592 other measurements were done at 90°C, for which the values of the above constants were not known. [10][11][12][13][14][15][16][17] The general iterative solution of the system of eq [1][2][3][4][5][6][7][8] …”

Section: A General Solution Of the Equation Systemmentioning

confidence: 99%

Application of the Flory—Mandelkern Equation to Unfractionated Poly(vinyl alcohol) Samples

Kalfus

1978

Polym J

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ABSTRACT:An iterative solution of the system of equations resulting from the FloryMandelkern equation and from the 11:-theorem was developed. The iteration involves experimental data for two unfractionated samples only, i.e., 2 values of intrinsic viscosity and 2 sets of sedimentation constants with the corresponding weight fractions. The efficiency of the iteration was shown for 21 samples of commercial poly( vinyl alcohol) (PV A) of different origin. Their degrees of hydrolysis were in the 97.7-99.4% range. The viscosity, sedimentation, and pycnometric measurements were done at 90°C in solutions which had been heated for 4 days in order to destroy the PYA associates. From sedimentation data at standard conditions, sedimentation constants were evaluated by a procedure which accounts for the concentration distribution along the ultracentrifuge cell due to the molecular mass distribution in the PV A samples. This in turn was determined from the sets of sedimentation constants and from the solution of the system of equations.KEY WORDS:

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Viscosity – Molecular Weight Relationships and Unperturbed Dimensions of Linear Chain Molecules

Kurata

Tsunashima

1999

The Wiley Database of Polymer Properties

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Zur Charakterisierung fraktionierter Polyvinylalkohole

Abstract: 869Plattcheii, eld die konstant bci 110-1 120 schmolwn. Troclmen 2 Std. bei YO-90u/ 0,Ol mni.

Cited by 47 publications

References 28 publications

Improved relationships for diffusion and sedimentation constants and for viscosity and streaming birefringence of solutions of polymers

Improved relationships for diffusion and sedimentation constants and for viscosity and streaming birefringence of solutions of polymers

Application of the Flory—Mandelkern Equation to Unfractionated Poly(vinyl alcohol) Samples

Viscosity – Molecular Weight Relationships and Unperturbed Dimensions of Linear Chain Molecules

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