Abstract
Measurements of solvent self-diffusion coefficients in the systems polystyrene/dichloromethane and polystyrene/cyclopentane recorded on a standard Fourier transform n.m.r. spectrometer are reported. The ratio D s D s,0 was found to decrease linearly with increasing volume fraction of polystyrene, over the interval studied ( ø PS <0.27), for both systems. For PS/cyclopentane an increase in temperature from 12.5°C (close to UCST) to 40°C was not found to alter the concentration dependence of the ratio D s D s,0 significantly.
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