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The unperturbed conformation and interaction parameters of polyvinylalcohol in aqueous solutions. Polydispersity effects

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  • Polymer Science
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Summary

Unperturbed conformation and interaction parameters of polyvinyl alcohol in aqueous solutions have been determined. To this end intrinsic viscosity-molecular weight data have been analyzed in terms of the Burchard-Stockmayer-Fixman (BSF) equation. A special form of this equation for polydisperse polymers has been derived. Values of the Flory-Huggins interaction parameter x, the polymer constantK 0 and other related quantities have been obtained using the original data of Matsumoto and Ohyanagi. For sake of comparison intrinsic viscosity-molecular weight data of several commercial PVA samples were measured and analyzed. The parameters obtained, are discussed in relation to other literature data of PVA. The viscosimetric ζ value agrees very well with literature values of ζ if the cubed viscosity radius expansion factor is given by the theoretical equation derived by Shimada and Yamakawa: α 3η =1+1.14 z +....

Zusammenfassung

Ungestörte Konformations- und Wechselwirkungsparameter von Polyvinylalcohol (PVA) in wäßriger Lösung wurden bestimmt. Dazu wurde die Beziehung zwischen der Grenzviskosität [η] und dem Molekulargewicht mit Hilfe derBurchard-Stockmayer-Fxman-Gleichung analysiert. Zuerst aber wurde eine besondere Form der BSF-Gleichung für polydisperse Polymere abgeleitet. Die gefundenen Werte für den Wechselwirkungsparameter ζ und die PolymerkonstanteK 0 wurden auf den originellen Daten von Matsumoto und Ohyanagi basiert. Zum Vergleich wurden verschiedene kommerzielle PVA-Muster analysiert. Die gemessenen ζ-Werte stimmen mit den Literaturwerten für ξ am besten überein, wenn für die Expansionskoeffizienten αη die theoretische Gleichung von Shimada und Yamakawa α 3η = 1 + 1.14 z ... eingeführt wird. Die Ergebnisse wurden anhand weiterer Literaturdaten über PVA erörtert.

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  1. Laboratory for Physical and Colloid Chemistry, Agricultural University, De Dreijen 6, 6703, BC Wageningen, The Netherlands

    L. K. Koopal

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Koopal, L.K. The unperturbed conformation and interaction parameters of polyvinylalcohol in aqueous solutions. Polydispersity effects. Colloid & Polymer Sci 259, 490–498 (1981). https://doi.org/10.1007/BF01397886

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