Methyl salicylate (wintergreen oil)-functionalized polypropylene (PP-KzSA) and polyvinyl chloride (PVC-KzSA) were synthesized and characterized in detail using ¹H NMR, differential scanning calorimeter (DSC), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM) techniques and stress-strain measurements. Elongations (%) were between 273 and 624% for PP-KzSAs while that of PP-Cl-control was 413%; elongations were between 104 and 315% for PVC-KzSAs while that of PVC-control was 10%. Interestingly, PVC-KzSAs were all elastomers. Because of their elasticity, they can be used as patch for slow delivery of wintergreen oil for the remedy of localized pain in human body. Au and Ag nanoparticles were embedded in PP-KzSA and PVC-KzSA copolymers to obtain metal organic nanocomposite materials. Surface plasmon resonance and fluorescence emission of the nanocomposite solutions were observed.