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 (G) and then to the translational 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 fw (M) for the single sample of polystyrene. The weight-average molecular weights calculated from fw (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.

WILAYAT AHMED KHAN ,IMTIAZ AHMED ,MUHAMMAD SIDDIQ ,KHALID MAHMOOD ,BAKHTIAR MOHAMMAD ,