Health & Environmental Research Online (HERO)


Print Feedback Export to File
521628 
Journal Article 
Characterization of a single sample of polymer by dynamic light-scattering technique 
Siddiq, M; Ahmed, I; Mahmood, K; Mohammad, B; Khan, WA 
2008 
Yes 
Journal of the Chemical Society of Pakistan
ISSN: 0253-5106 
30 
4 
532-535 
English 
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 (Gamma) 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 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.