Modification of PVC with captopril and complexation reaction for preparing photostability and thermal stability of PVC

Studying the photodecomposition rate constant and morphology properties of modified poly(vinyl chloride) with novel Schiff's bases

“…Before exposure, the image showed no holes, cleavages, damages, white or gray areas, as seen in Figure 9A. After irradiation, a number of light gray or white patches with plenty of holes were noted in the presence of severe fractures, which were assigned to photodegradation induced by UV light 37 . Figure 10 displays SEM images of modified PVC films with synthetic additives (−ed/o‐NO 2 , −ed/p‐OH, −ed/o‐OMe, and −ed/p‐OMe) after 300 h of exposure to UV rays, with only 5 wt% of additives used.…”

“…After prolonged exposure to radiation, the morphology of PVC became rougher and developed cracks. 37 As shown in Table 2, the root mean square (R q ) and roughness average noticeably increased from 1.9 and 2.5 nm before irradiation to 5.25 and 7.05 nm after irradiation, respectively. The values of these two factors decreased after irradiation when additives were added, compared to plain films.…”

“…After irradiation, a number of light gray or white patches with plenty of holes were noted in the presence of severe fractures, which were assigned to photodegradation induced by UV light. 37 exposure to UV rays, with only 5 wt% of additives used.…”

The inhibition performance of a novel iron (III), copper (II), and nickel (II) complexes with Schiff base ligand derived from salicylaldehyde and p–phenylene diamine on Polyvinyl chloride photodegradation

“…Irradiation of PVC by ultraviolet irradiation at 250-350 nm wavelength for a long time of exposure leads to observable changes in color and mechanical properties accompanied by a sharp reduction in its molecular weight and tensile strength, which shortens its using life [9,10]. Oxygenated containing intermediates, polyenes, and chlorophyll residues are produced under ultraviolet irradiation and lead to the photodegradation process [11,12]. So, it is important to photostabilize PVC polymer to increase its lifetime during use as a nal product [13].…”

“…Consequently, the production of a new substance that performs as an effective additive for enhancement of PVC photostability because of their capability for hydrogen chloride, and chloride radicals scavengers produced during the photodegradation process of PVC chains [19]. Nonetheless, in the two past decades, Numerous PVC additives have been synthesized and studied as photo stabilizers counting inorganic chemical salts [20,21], hetero-cycles compounds [11,22], aromatics [23][24][25], and titanium dioxide [25,26]. These compounds display extraordinary effectiveness toward inhibition of the photodegradation process of PVC afterward long period exposure of to ultraviolet light.…”