Photostabilization, Thermodynamic and Theoretical Studies of polystyrene by some 2-amino pyridine

Abstract

Polystyrene (PS) films are photostabilized by 2-amino pyridine derivative compounds. Investigations were conducted on compounds of (a-e). The casting method was used to create PS films with complexes present in concentrations of 0.5 % by weight, while chloroform served as the solvent. By keeping track of the carbonyl indices as the exposure duration progressed, the photostabilization activities of these compounds were discovered. Using chloroform as a solvent, the variations in PS’s viscosity average molecular weight with exposure time were also monitored. The theoretical results of the PS modification compounds showed that the total energy values ​​of PS-D are higher energy content than the rest of the studied models. The negative sign in the HOMO energy indicates stability, that is, it is less effective, where values ​​are shown (HOMO) PS-C is the least effective (stable) and PS-E is the most effective (unstable). The thermodynamic theoretical outcome was shown that all reactions are endothermic and spontaneous, and the results of the (energy gap) values ​​gave a range from 2.38453 eV for PS-C to 2.60277 eV. For PVC-E, which proves that all PS modifications are conductive or semiconducting materials for electricity.

HIGHLIGHTS

• Chemicals with 2-amino pyridine derivatives were used to study the photostabilization of PS films. For PS films, these chemicals function effectively as photostabilizers. These supplements Through UV absorption or screening, FTIR spectra, weight loss, and optical microscopy, the PS films are stabilized. According to the aforementioned processes and photostability, compound (a) was found to be the most effective in the photostabilization process. The use of molecules (a-e) that are 2-amino pyridine derivatives is encouraged by these mechanisms

GRAPHICAL ABSTRACT