Abstract
The technique of dynamic light scattering from isorefractive ternary solutions was used to examine the tracer diffusion of linear and star polystyrenes in poly(vinylmethylether) solutions, and of linear polystyrenes in poly(vinylmethylether) gels. A hydrodynamic scaling model is unable to provide an adequate description of the relative solution mobilities of star and linear polymers of equal total molecular weight. In a gel with concentration equal to 0.235 g/cm 3, it was found that the tracer diffusivity scales as M −2.9 for linear polymers, where M is the molecular weight, by contrast with the reptation prediction of M −2.
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