Abstract Algae-based materials appear to be promising substitutes for plastics in many applications due to their eco-friendly belongings. However, high solubility, thermal stability, and mechanical strength are still challenges. This work evaluated K-Carrageenan/Alginate films (Kc/Alg) reinforced with cellulose nanofibers (CNF) according to their thermal, mechanical, and morphological aspects. Scanning electron microscopy revealed a CNF entanglement and improved dispersion along the matrices showing a basic one-phase microstructure. This structure determines the enhanced properties such as water solubility, thermal stability, and mechanical resistance. In addition, we achieved the maximal tensile strength of 58.9?MPa for CNF-composite without the addition of plasticizers. These results indicate Kc/Alg/CNF nanocomposites can be a suitable alternative material for coating applications such as packages, carrier vehicles for medication, and nutrients.Graphical Abstract
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