Combined effect of hindered amine light stabilizer and antioxidants on photodegradation of poly (vinyl chloride)

Abstract

Casted PVC films with hindered amine light stabilizer (HALS) and antioxidants are photo-irradiated for 400 h and the process of photodegradation is characterized by color differences, ultraviolet-visible (UV-vis) spectroscopy, Fourier transformation infrared (FT-IR) spectroscopy and viscosity-average molecular weight (M ). When added to PVC separately, hindered amine derivate (T770) and phenol antioxidant ( 1076) both have little effect on the dehydrochlorination and oxidation of PVC films. In PVC films with T770/1076, the extension of shorter polyenes is retarded during photo-irradiation of 400 h. The extension of longer polyenes is well retarded from 0 h to 200 h. T770/ 1076 has only a little effect on the anti-oxidation of PVC films from 0 h to 400 h. The p-phenylenediamine antioxidant (4010NA) and 2-Mercapto benzimidazole (MB) both accelerate the photodegradation and crosslinking of PVC films. However, there is no crosslinking in PVC with T770/4010NA and PVC with T770/MB and the degradation of PVC films is weakened. This phenomenon means the light stabilizer T770 protects antioxidants (4010NA and MB) from photo-irradiation and antioxidants can play a positive role in the antioxidative effect.

Preparation of a Nano-TiO2-Loaded Antioxidant and Its Anti-aging Performance against UV/O3 in Thermoplastic Vulcanizates

“…The degradation of TPV compounds during the aging process can generate hydroperoxides and carbonyl species . The carbonyl index is a commonly used quantitative method for evaluating the extent of degradation of polymers. , The variation of the carbonyl index of TPV compounds with UV/ozone aging time was characterized and is presented in Figure . As one can see, the carbonyl index of the TPV sample significantly increased with exposure time, indicating the ascending degree of aging of the material.…”

Investigation of thermal and mechanical properties of new nitrogen-rich organic based heat stabilizers for poly (vinyl chloride)

“…In recent years, several studies have been conducted in the fields of nitrogencontaining compound synthesis, sustainable additives for PVC, and the investigation of the thermal and mechanical properties of this polymer as a result of modification with these additives. [18][19][20] Nitrogen-containing compounds such as urea derivatives such as DAU, MAU, and MATU have shown good potential as an organic stabilizer. [21][22][23] These nitrogen-containing organic-based thermal stabilizers indicated an excellent thermal stability for PVC products.…”

Relationship between the passivation of TiO2 particles and LLDPE photodegradation: a comparison between bulk and surface impacts

“…To reduce rutile reactivity, TiO 2 particles are typically passivated by metallic oxides, and the passivated effect can be improved by using amine hindered light stabilizers (HALS) . TiO 2 particles are commonly coated with individual or mixtures of metallic oxides, such as alumina (Al 2 O 3 ), silica (SiO 2 ), and zirconia (ZrO 2 ) .…”