Author/Authors :
SIDDIQ, MOHAMMAD Quaid-i-Azam University - Department of Chemistry, Pakistan , AHMED, IMTIAZ University of Peshawar - Islamia College, Pakistan , MAHMOOD, KHALID Gomal University - Department of Chemistry, Pakistan , MOHAMMAD, BAKHTIAR Hazara University - Department of Chemistry, Pakistan , KHAN, WILAYAT AHMED Gomal University - Faculty of Pharmacy, Pakistan
Abstract :
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.
