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Ultra‐Strong, Highly Transparent, and Degradable Calcium Alginate Bioplastic
Summary
Scientists made a new plastic from seaweed extract that's surprisingly strong, clear like glass, and actually breaks down in the environment, unlike regular plastic, which sticks around for centuries and breaks into microplastics that end up in our food and bodies. This seaweed-based plastic could one day replace things like food packaging or plastic wrap without leaving behind the pollution or health concerns tied to conventional plastics.
ABSTRACT Derived from non‐renewable petroleum resources, conventional plastics are ubiquitous synthetic polymers that have provided immense societal convenience. However, their resistance to degradation has led to a global environmental crisis, with persistent waste accumulating in terrestrial and marine ecosystems and microplastics infiltrating the food chain. This urgent challenge necessitates the development of sustainable and biodegradable alternatives. A major obstacle is that most currently available bioplastics lack the mechanical robustness and optical transparency required for widespread practical applications. In this work, we present a straightforward and efficient method for fabricating high‐performance bioplastic films from alginate, a natural polysaccharide extracted from brown algae. Our process involves dissolving sodium alginate (SA) to form a homogeneous solution, casting it into a film, and subsequently crosslinking it with calcium ions (Ca 2+ ). Under the dry testing conditions used in this study, the resulting calcium alginate (CA) films exhibited a maximum tensile strength of 239.7 MPa and a visible‐light transmittance of approximately 84%–85% at 550 nm. In addition, the material exhibited excellent biocompatibility and underwent substantial degradation under the environmental conditions examined. These findings demonstrate the potential of CA films as transparent, mechanically robust, and sustainable bioplastic materials, offering a promising alternative to conventional petroleum‐derived plastics.