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Polyelectrolyte behaviour of poly(vinyl alcohol)-boric acid complexes

✍ Scribed by L. Moneva-Andonova

Publisher: John Wiley and Sons
Year: 1991
Tongue: English
Weight: 246 KB
Volume: 42
Category: Article
ISSN: 0323-7648
DOI: 10.1002/actp.1991.010421112

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✦ Synopsis

The polyelectrolyte behaviour of poly(viny1 alcohol)-boric acid complexes is investigated. A plateau is observed in the dependence of pK, on the degree of neutralization, while the HENDERSON-HASSELBACH plots show two linear regions with different slope related to two different macroconformations. The complexes undergo a transition to an extended rigid conformation when neutralized in aqueous solution determined by decreased flexibility of the chain and charge acquisition.

Polyelektrolyrisches Verhalten von Poly (vinylalkoho1)-Borsuure-Komplexen

Das polyelektrolytische Verhalten von Poly(vinylalkoho1)-Borsaure-Komplexen wurde untersucht. In Abhiingigkeit des pK,-Wertes vom Neutralisierungsgrad wurde ein Plateau gefunden, wihrend in der HENDERSON-HASELBACH-Darstehng zwei lineare Bereiche mit unterschiedlicher Steigung auftraten, die zu nvei verschiedenen Makrokonformationen gehoren. Bei der Neutralisierung in wii0riger Losung erfolgt, bedingt durch die verringerte Biegsamkeit der Ketten und die Ladungsaufnahme, ein fibergang der Komplexe in die starre, gestrecktkettige Konformation.

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