PS/CdS, PVC/CdS & PMMA/CdS polymeric nanocomposite samples were prepared through dispersion solution casting technique. The CdS nanoparticles were prepared by simple chemical method using CdCl₂ and H₂S gas produced from thiourea. The nanoscale morphology of the polymer nanocomposite samples was characterized using small angle x ray scattering (SAXS). SAXS reveals that CdS interact well with the polymer matrix and exhibit their nano nature. [DOI: 10.1380/ejssnt.2014.420]