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Investigating sustainable insulation materials: Analysis of biofoams and petroleum-derived foams
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Researchers compared the thermal insulation properties of expanded polypropylene, expanded polystyrene, corn-based biofoam, and eggshell-derived polyurethane, finding that the eggshell-derived material achieved the lowest thermal conductivity (0.029 W/m·K) and best structural stability under cyclic thermal stress, identifying it as a promising sustainable alternative to petroleum-based insulators.
We evaluated the thermal insulation properties of expanded polypropylene (EPP), expanded polystyrene (EPS), corn-based biofoam (CBF), and eggshell-derived polyurethane (PDE) to identify sustainable alternatives to conventional insulators. We hypothesized that bio-derived materials, such as CBF and PDE, could provide comparable or even superior insulating performance while offering significant environmental benefits. Using a heat flow meter, we measured thermal conductivities, revealing that PDE exhibited the lowest conductivity (0.029 W/(m⋅K), suggesting superior insulative properties compared to EPP and CBF, which demonstrated higher conductivity (0.038 W/(m⋅K) and 0.045 W/(m⋅K) respectively). Thermal stability tests under cyclic thermal stress indicated that PDE maintained structural integrity better than other materials, particularly EPS and CBF, which showed considerable degradation. These results support the potential of eggshell-derived polyurethane as an effective, eco-friendly insulation material, warranting further research into its production scalability and environmental impacts.
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Researchers created a new eco-friendly foam material by embedding recovered marine microplastics into a bio-based matrix, producing an open-cell insulating material with strong acoustic and thermal properties. The innovation offers a potential path to upcycle hard-to-recycle mixed marine plastic waste into useful building and industrial insulation products.
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This review paper takes stock of new plant-based and biodegradable foam materials, like those made from cellulose and plant sugars, that could replace traditional petroleum-based foams used in packaging and insulation. These greener alternatives break down more easily instead of persisting in the environment as plastic waste and microplastics, though the research shows some, like bio-based polyurethane foams, are still hard to recycle due to their chemistry. While scientists have made real progress, especially with super-insulating cellulose foams, the paper notes that cost, scalability, and further innovation (including AI-assisted design) are still needed before these materials show up widely
Sodom Apple (Calotropis procera) Fibre as a Sustainable Thermal Insulator: Performance Evaluation for Low-Carbon Thermal Storage Systems
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Calotropis procera (Sodom Apple) plant fiber achieved 84.7% of the thermal performance of expanded polystyrene foam insulation while offering a biodegradable, low-carbon alternative that avoids the microplastic generation associated with EPS breakdown. This bio-based insulation demonstrates that natural lignocellulosic materials can replace conventional plastic foams in thermal storage applications, reducing long-term microplastic pollution from insulation materials.
Lightweight and eco-friendly methyl cellulose foams featuring moisture-induced form interlocking: A versatile alternative to conventional plastic foams.
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Researchers fabricated a fully biodegradable methyl cellulose foam using only mechanical agitation and oven drying—no chemical additives—yielding an ultra-low-density material with 99% porosity, strong thermal insulation, and moisture-activated form-interlocking capability that positions it as a viable sustainable substitute for petroleum-based plastic foams.
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