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The range of applications of polymeric materials is extending at an amazing rate and the number of additives available to modify polymer properties is increasing proportionately. These additives include antioxidants, UV stabilizers, lubricants, and so on. Polymeric materials undergo degradation when they are exposed to the ultraviolet (UV) radiation in sunlight. This degradation process results in a change in the appearance and reduction of the physical properties. ortho-Hydroxyphenyl benzotriazoles are commonly used as UV absorbers (UVAs). They absorb potentially destructive UV radiation and dissipate the energy on a subpicosecond time scale. 1-6 The UVA is used to filter off UV radiation and dissipate the energy in the form of heat. UVAs must have a wide range of chemical and physical properties to be useful in applications, which include coatings and a wide variety of polymer products. 1 Tinuvin 213 is a mixture of polyethylene glycol (PEG) and two types of polymeric UVAs. It commonly applies to poly(methyl methacrylate) (PMMA), natural rubber (NR), thermoplastic elastomer (TPE), and so on. Chemical structures of the two UVAs are shown in Scheme 1. They are [3-[3-(2H-benzotriazol-2-yl)5-(1,1-dimethylethyl)-4-hydroxyphenyl]-1-oxopropyl]-hydroxypoly(oxo-1,2-ethanediyl) (CAS number: 104810-48-2) and 3-[3-(2H-benzotriazol-2-yl)-5-(1,1-dimethylethyl)-4

Analysis of Polymeric UV Absorber (Tinuvin 213) Using LDI-TOFMS: Solvent Effect in Sample Preparation