Characterization of a Single Sample of Polymer by Dynamic Light-Scattering Technique

This article describes the characterization of a single sample of polystyrene in toluene using laser light-scattering (lls) technique. in dynamic lls the laplace inversion of precisely measured intensity-intensity time correlation function lead us first to an estimate of the characteristic line-width distribution g (t) and then to the translation diffusion coefficient distribution g (d). by using previously established calibration of d = (3.64 x 10^-4) m^-0.577, we were able to convert g (d) into a differential weight distribution f w (m) for the single sample of polystyrene. the weight-average molecular weights calculated from f w (m) are comparable to that obtained directly from static lls. our results showed that using single polystyrene sample instead of a set of narrowly distributed samples provided not only similar final results, but also a more practical method for polystyrene characterization.