We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Towards Sustainable Food Packaging: Mechanical Recycling Effects on Thermochromic Polymers Performance
AI summary Read the abstract
Researchers examined how mechanical recycling affects the thermochromic properties and structural integrity of food packaging materials, finding that repeated recycling cycles degraded color-change performance and increased microplastic shedding from recycled packaging.
Integrating thermochromic pigments (TPs) into food packaging offers significant benefits for monitoring temperature variations, improving food safety, and reducing waste. However, the recyclability of such materials remains underexplored, particularly regarding the retention of their optical and mechanical properties after repeated recycling. Addressing this gap, this research aims to evaluate how mechanical recycling affects key properties of polypropylene (PP) blends containing varying TP concentrations. Three formulations, PP100/TP0 (0% TP), PP98/TP2 (2% TP), and PP92/TP8 (8% TP), were subjected to five recycling cycles, with changes in thermal stability, color transition behavior, mechanical integrity, and surface morphology analyzed. The results indicate that PP100/TP0 maintained its mechanical integrity with minimal degradation (6% absolute crystallinity loss; color difference ΔE*ab = 1.45) across recycling cycles. However, blends containing TPs exhibited progressive deterioration. P98/TP2 displayed moderate reductions in mechanical strength (-10.8%) and thermochromic efficiency (color change ΔE*ab = 6.52), while PP92/TP8 showed significant degradation, including increased activation temperatures (+3.8 °C) and color vibrancy loss (42.9% loss in saturation). These effects were attributed to polymer breakdown, pigment aggregation, and altered crystallinity. Despite the limitations of recyclability, this study provides critical insights into the feasibility of TPs in sustainable, intelligent food packaging. Further research is required to enhance TP stability during reprocessing, ensuring long-term functionality in circular packaging systems.
More Papers Like This
UV-Induced Aging in Thermochromic Pigment-Integrated Food-Grade Polymers: A Performance Assessment
AI summary Read the abstract
Researchers tested how UV light exposure degrades food-grade polypropylene plastics that contain thermochromic pigments used as temperature indicators on packaging. They found that UV exposure caused significant color fading, mechanical weakening, and mass changes in the material over time. The results raise concerns about the long-term reliability of these temperature-sensitive plastics and their potential to generate microplastics as they degrade.
UV-Induced Aging in Thermochromic Pigment-Integrated Food-Grade Polymers: A Performance Assessment
AI summary Read the abstract
Food-grade polypropylene blends containing thermochromic pigments were exposed to simulated indoor and outdoor UV light for 500 and 1000 hours, revealing that UV degradation compromises both the visual temperature indicators and the mechanical properties of the polymer matrix.
A new approach to food packaging, a recycling assessment using in vitro strategies
AI summary Read the abstract
Researchers evaluated new sustainable food packaging materials for their potential to release microplastics into food, using in vitro digestion strategies to assess exposure. The study found that even recycled and bio-based packaging materials can shed particles under digestive conditions.
Mechanical recycling of printed flexible plastic packaging: The role of binders and pigments
AI summary Read the abstract
Researchers investigated how specific ink components, including pigments and binders, affect the quality of mechanically recycled low-density polyethylene flexible packaging. They found that nitrocellulose binder degraded during reprocessing, causing discoloration and releasing potentially odorous compounds, while pigment particles reduced the recycled film's durability. The study highlights that printed inks are a significant barrier to producing high-quality recycled plastic from post-consumer packaging waste.
A new approach to food packaging, a recycling assessment using in vitro strategies
AI summary Read the abstract
This study assessed sustainable food packaging materials using in vitro strategies to evaluate recycling potential and microplastic release, within the framework of the European strategy for reducing plastic in packaging. Results provided data on whether recycled packaging materials release microplastics and how circularity approaches affect plastic particle contamination of food.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.