Photostabilizing efficiency of ultraviolet light stabilizers for rigid poly(vinyl chloride) against photo‐oxidation

Abstract

The photostabilizing efficiency of different light stabilizers in poly(vinyl chloride) (PVC) was investigated by discoloration, ultraviolet (UV) reflection experiment, Fourier transform infrared spectrum (FTIR), and scanning electron microscopy (SEM). The results show that the addition of light stabilizers can slow down discoloration of PVC. The UV reflection results verify that this change is due to the distribution of light stabilizers on irradiated surfaces, which can absorb (such as organic stabilizers) or reflect (such as titanium dioxide) UV light differently. The order of stabilizers that can slower the extent of discoloration is titanium dioxide (TiO 2 ) > Tinuvin 234 (U4) > XT 833 (H2), U4 > Tinuvin 531 (U3) > Chimassorb 944 (H1), phenyl salicylate (U1). FTIR results show that the carbonyl group of pure PVC, TiO 2 , and H1-doped PVC increases significantly, indicating that the photooxidation reactions of these irradiated samples are relatively serious. The SEM results show that the surface damages of PVC doped with U2, U4, and H2 are somehow slighter, with only small holes or cavities on the surface, whereas the surfaces of pure PVC and H1doped PVC are full of big and deep holes and some holes or cavities of 10 lm are detected. POLYM. ENG.

The Trend of Additives for Poly(vinyl chloride) as Photostabilizers: Article Review

“…The TiO 2 must be used with different light stabilizers, however, TiO 2 can delay the discolouration of irradiated PVC films efficiently, however, the surface undergoes oxidation and form the caverns Fig. (7) that bring by both the bad protection to surface of specimen and the photo-catalysis that is stimulated by UV light, water, and oxygen that accelerates deterioration [20].…”

A Surface Morphological Study, Poly(Vinyl Chloride) Photo-Stabilizers Utilizing Ibuprofen Tin Complexes against Ultraviolet Radiation

“…Various additives with low concentrations were used for the inhibition of PVC from the photo-degradation process. The most familiarly used additives are organometallics, like organotin complexes [13][14][15], organic [16,17], and others [18][19][20][21][22][23][24][25][26][27][28]. In this work, we report the synthesis of Ibuprofen tin complexes and the evaluation of their activity as photo-stabilizers for the PVC.…”

Tailoring the desired optical and mechanical performance of polyester‐plasticized PVC films: the role of different light stabilizers on the photo‐degradation

“…On the one hand, pure PVC undergoes rapid autocatalytic dehydrochlorination upon exposure to light during outdoor application . As a result, the dehydrochlorination leads to the formation of long, conjugated polyene sequences (−CH=⃥CH–) n in the polymer chains, which gives the red‐brown color of degraded PVC . Irradiation‐induced degradation also causes the drastic loss in the mechanical properties of PVC .…”

“…[8] As a result, the dehydrochlorination leads to the formation of long, conjugated polyene sequences (ÀCH=CH-) n in the polymer chains, which gives the red-brown color of degraded PVC. [9,10] Irradiation-induced degradation also causes the drastic loss in the mechanical properties of PVC. [11] Moreover, photo-degradation is primarily a surface process because of the limited penetration of ultraviolet (UV)-visible radiation; the surface properties of the degraded polymer are substantially changed regarding the loss of abrasion resistance, gloss, and interfacial free energy.…”