Abstract
The dynamics of the behaviour of low molecular particles in films and solutions of polyvinyl alcohol (PVA) have been investigated by fluorescence quenching. In relatively dilute PVA solutions the presence of polymer has scarcely any influence on the mutual diffusion of the illuminant (tracer) and the quenching agent. It was found that in PVA films there are illuminant molecules that are inaccessible to molecules of the quenching agent and their behaviour is determined by relaxation properties of the matrix and also of illuminant molecules which, despite the rigidity of the matrix, participate in rapid dynamic quenching. This diversity of behaviour of marker molecules in PVA films apparently stems from a nonuniform distribution of molecules of the illuminant and of the quenching agent in the polymeric matrix. Distribution of marker and quenching agent molecules in the polymer may be controlled by the introduction of plasticizers.
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