Investigation of hydrogen-bonding structure in blends of poly(N-vinylpyrrolidone) with poly(vinyl acetate-co-vinyl alcohol) using positron annihilation

J. M G Cowie, I. McEwan, I. J. McEwen, R. A. Pethrick

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

The effect of hydrogen bonding on the free volume in polymer blends is reported using infrared spectroscopy and positron annihilation lifetime spectroscopy (PALS). The system under investigation comprised blends of poly(N-vinylpyrrolidone) with poly(vinyl acetate-co-vinyl alcohol) containing varying ratios of vinyl acetate:vinyl alcohol. Infrared spectroscopy revealed the presence of hydrogen bonding in the blends as a shift to lower wavenumbers of the pyrrolidone carbonyl and the alcohol hydroxyl bands. PALS revealed an increase in free volume, in comparison to the individual components, of the polymer blends with increase in the hydrogen bonding, but this is followed by an unexpected "collapse" of the network structure above a critical value of hydrogen bonding.

Original languageEnglish
Pages (from-to)7071-7075
Number of pages5
JournalMacromolecules
Volume34
Issue number20
DOIs
Publication statusPublished - 25 Sep 2001

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