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Abstract
The effect of solvent vapour on the properties of vapour-swollen vinyl chloride-vinyl acetate ( 83 17 ) copolymer has been studied by a fluorescence probe, a p- N, N-dialkylaminobenzylidenemalononitrile derivative ( 1). Results show that the fluorescence quantum yield ( Ф f ) of 1 in vinyl chloride-vinyl acetate ( 83 17 ) matrix decreases by a factor of ≈ 10, an indication of the increase in free volume or in polymer chain mobility, upon vapour swelling. The variations of Ф f observed in various swollen matrices, which correlate only with the density of the swelling solvent, indicate that there is a profound vapour effect on the properties of swollen polymer. A density effect on the mobility of polymer chains in swollen polymer is proposed.
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