Abstract

Various effects which can distort the molecular weight distribution (MWD) determined by dynamic light scattering (DLS) are discussed. For example, it is shown that the required molecular weight dependence of the diffusion coefficient must be fairly accurately known if the MWD is to be determined with acceptable error limits. It is moreover investigated to what extent a result for the MWD may be distorted when this result is obtained by a fit under the assumption of an incorrect MWD-type. In addition, the scattering-angle accuracy required for a reliable determination of the MWD, and consequences (for the MWD) which may arise from statistical errors in the experimental DLS-curves, are treated.

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