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Article Abstract

This article is focused on the development and characterization of a series of biodegradable and eco-friendly colour masterbatches (MBs), based on natural pigments and biodegradable polylactic acid (PLA) and polybutylene succinate (PBS). Four commercial natural pigments were used, spirulina, curcumin, beetroot and chlorophyllin, to develop the colour masterbatches using a twin-screw extruder. The natural pigment-based MBs were added at 2, 4 and 6 wt%, as additives to study the effect on the properties of injected biodegradable parts (PLA and PBS). The injected samples were characterized in terms of their mechanical (tensile and Charpy impact tests) and visual properties (according to CieLab). In addition, the ageing of the coloured material was followed by colorimetric analysis after its exposure under a Xenon lamp. The mechanical results showed that the addition of coloured masterbatches in different percentages (2-6 wt%) did not significantly change the properties of the materials with respect to the as-received ones. A noticeable colour difference in the injected samples was observed after the first 50 h of artificial light exposure. Regarding environmental concerns, the study showed that the carbon footprint of natural pigments and electricity consumption during extrusion and pelletizing were lower.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11314074PMC
http://dx.doi.org/10.3390/polym16152116DOI Listing

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Article Synopsis
  • The article details the creation of biodegradable color masterbatches (MBs) using natural pigments mixed with biodegradable materials like PLA and PBS.
  • Four natural pigments—spirulina, curcumin, beetroot, and chlorophyllin—were incorporated at varying percentages to assess their effects on the properties of injected biodegradable parts.
  • The study found that while the addition of these pigments did not significantly alter the mechanical properties, a noticeable color change occurred after 50 hours of exposure to artificial light, and overall, the eco-friendly pigments had a lower carbon footprint.
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