Investigation into the Effect of Spinel Pigments on the Photostability and Combustion Properties of Ethylene-Norbornene Copolymer

Abstract

Multicolor ethylene-norbornene (EN) composites filled with three different spinel pigments (Cobalt Green-PG50, Zinc Iron Yellow-PY 119, Praseodym Yellow-PY159) were prepared by melt mixing and characterized in terms of their stability under destructive environmental conditions. The EN films were subjected to accelerated aging by ultraviolet (UV) photooxidation for 300 h, 600 h, or 900 h. The mechanical performance of the EN composites was investigated in static and dynamic mechanical tests. The morphologies of the EN samples and their color changes during the aging process were evaluated by scanning electron microscopy (SEM) and spectrophotometric measurements. Fourier transform infrared (FTIR) spectroscopy was applied to determine the amount of carbonyl groups resulting from surface oxidation at different aging times. The effects of the spinel pigments on the thermal stability and combustion properties of the multicolor polymer composites were also assessed, and compared with a sample containing the organic Pigment Yellow 139 (PY139). The results show that the color changes (ΔE) in the spinel pigments were minor in comparison to those in the organic pigment (PY139) and the reference film. The Zinc Yellow (PY119) pigment was the most effective stabilizer of EN copolymer. Moreover, the spinel pigments had a positive effect on the flame retardancy of the EN composites. Microcombustion tests (MCC) showed that the incorporation of both the spinels and the organic pigment PY139 into the EN matrix reduced the heat release rate (HRR) and total heat release (THR) parameters.

Historically Inspired Strategy to Achieve Sustainable and Effective Coloration of Bioplastics

“…PCL, PBS, and PLA matrices decompose in a single step centered at around 405, 395, and 352 °C, respectively (Figure S2). − No significant influence for the presence of 2% wt of LWP in PCL, PBS, and PLA is observed, with only a slight improvement of thermal stability for PCL_2LWP- and PLA_2LWP-based nanocomposites, already confirmed in the case of biobased polyesters containing natural additives. , Differential scanning calorimetry was also considered to investigate the effect of LWP on glass transition, crystallization, and melting phenomena of PCL/PBS/PLA bionanocomposites (Figure S3). No significant changes were observed in the first, second heating and cooling scans of neat polymers and relative nanocomposites loaded with 0.1 and 1% wt of LWP filler.…”

“…35−37 No significant influence for the presence of 2% wt of LWP in PCL, PBS, and PLA is observed, with only a slight improvement of thermal stability for PCL_2LWP-and PLA_2LWP-based nanocomposites, already confirmed in the case of biobased polyesters containing natural additives. 38,39 Differential scanning calorimetry was also considered to investigate the effect of LWP on glass transition, crystallization, and melting phenomena of PCL/PBS/PLA bionanocomposites (Figure S3). No significant changes were observed in the Different superscripts within the same column and in the same polymeric-based systems indicate significant differences among formulations (p < 0.05).…”

Photo Stabilization of Poly (Vinyl Chloride) Films by Some Nickel Complexes

“…Pigment discoloration, weathering, plastic yellowing, gloss loss, mechanical property loss (cracking), skin cancer, and other UV-related issues are typically caused by UV effect. Manufacturers of cosmetics, contact lenses, paints, and plastics are highly helpful in offering goods that remain constant for a long time when exposed to light [1,2].…”