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Sustainable and biodegradable polymeric foams: Processing–structure–property relationships, scalability, and circular design perspectives
Summary
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
Green and biofoams based on polymers are becoming key resources for addressing the energy-consumption, carbon-neutral, and plastic pollution issues the world faces. The conventional foams, which are based on petroleum, dominate the markets for insulation and packaging but have negative impacts on environmental persistence, flammability, and end-of-life. It is a critical review of the latest developments of three major sustainable foam systems: bio-based polyurethane systems, polysaccharide-based foams, and biodegradable polyester foams (PBS, PBAT, PLA). It focuses on processing structure property relationships, such as nucleation thermodynamics, melt rheology, crystallization-assisted foaming, and supercritical CO 2 processing. Ultralow thermal conductivity (∼0.031 W/m·K) in foams made of cellulose is attainable by directional freezing, and polyester-based microcellular foams have excellent mechanical resilience due to rheological tuning and branching strategies. Bio-based polyurethane foams are industrially scalable, but are limited with recycling because of thermoset chemistry. An intrinsic trade-off analysis of porosity, flame retardancy, mechanical integrity, and scalability suggests that a comparative techno-economic and circularity analysis is inherently required. The directions of nanocellular engineering, hybrid bio-nanocomposites, AI-aided formulation optimization, and circular material design are the areas of research in the future that will enable quicker commercialization.