SOLVENT DEPENDENCE OF MAGNETIC-FIELD EFFECT IN A POLYMER-LINKED EXCIPLEX SYSTEM

The response of pyrene-polystyrene-dimethylaniline (Py-PS-DMA) polymer (M(n)=4770) to an externally applied magnetic field has been examined in different solvents. Although the dielectric-constant (epsilon) eff ect is similar to that for the unlinked system, a closer look. shows a n interesting dependence on the nature of the solvent mixture. In pure acetone Delta phi/phi is higher than that in a mixed solvent (tetrahy drofuran/dimethylformamide) of the same epsilon. The results have been explained on the basis of the fact that the influences of coil extens ion on the magnetic-held effect and the dielectric-constant effect com pete with each other, resulting in different behaviours depending on t he nature of the solvent mixture.