Abstract
The local dynamics of a polyisoprene labelled with anthracene in the middle of the chain are investigated both in decalin solution and in bulk polyisoprene using the fluorescence anisotropy decay technique. Several types of orientational autocorrelation functions have been tested. Hall and Helfand's expression accounts for the experimental data in the case of solution, whereas the generalized diffusion and loss model is more satisfactory in the case of bulk polymer. The influence of various parameters (such as temperature, medium and nature of the polymer chain) on correlation times is discussed. It is shown that the orientational memory is stronger in the bulk than in a solvent of small molecules.
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