We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
UV-Induced Aging in Thermochromic Pigment-Integrated Food-Grade Polymers: A Performance Assessment
Summary
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.
Food contact polymers require thermochromic pigments to provide temperature-sensitive visual cues for consumer safety and product integrity. However, their susceptibility to ultraviolet (UV) degradation limits long-term application. This study investigates the UV resistance of food-grade thermochromic polypropylene blends under simulated indoor and outdoor UV exposure for 500 and 1000 h. Visual properties, colorimetric (CIE L*a*b*) measurements, mechanical testing (tensile and impact), and mass variation analysis were performed to assess photostability and material integrity. Exposure to UV led to progressive discoloration (ΔE*ab up to 34.07) and significant mechanical deterioration. Tensile strain at break decreased by 48.67%, and notched impact strength dropped by 44.15% after 1000 h of UV exposure. No measurable mass loss occurred, indicating degradation was confined to surface-level oxidation rather than bulk material erosion or leaching. These findings highlight the need for optimal pigment loading and UV stabilization to extend the shelf life of thermochromic food packaging materials in light-exposed storage and retail environments. The study offers a framework for improving the long-term reliability of smart packaging in the food industry. This work uniquely integrates optical, mechanical, and mass loss analyses to evaluate thermochromic packaging degradation under extended UVA exposure.
Sign in to start a discussion.
More Papers Like This
UV-Induced Aging in Thermochromic Pigment-Integrated Food-Grade Polymers: A Performance Assessment
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.
Evaluating the Chemical Resistance and Performance of Thermochromic Polymers for Food Packaging
Researchers tested thermochromic pigments blended into food packaging polymers to evaluate their durability when exposed to different food-contact environments. They found that while the color-changing pigments generally maintained their function, exposure to acidic and alkaline conditions caused some degradation of mechanical and optical properties. The study provides practical guidance for developing smart food packaging that can visually indicate temperature changes while remaining safe for food contact.
Evaluating the Chemical Resistance and Performance of Thermochromic Polymers for Food Packaging
This study evaluated the chemical resistance of thermochromic pigment-polymer blends used in food packaging after exposure to acidic, alkaline, oil-based, and neutral environments. Results showed that optical stability and mechanical integrity varied significantly across exposure conditions, raising questions about the long-term safety of thermochromic food packaging.
Towards Sustainable Food Packaging: Mechanical Recycling Effects on Thermochromic Polymers Performance
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.
Modelling the Photodegradation of Marine Microplastics by Means of Infrared Spectrometry and Chemometric Techniques
Researchers modeled the photodegradation of polyethylene and polypropylene marine microplastics using infrared spectrometry and chemometric techniques, tracking structural and chemical changes during accelerated UV aging that simulated five years of solar exposure.