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

中文翻译：

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海藻多糖/纤维素纳米纤维复合薄膜的热学、力学和物理性能

由于藻类材料的环保特性，它们在许多应用中似乎是塑料的有希望的替代品。然而，高溶解度、热稳定性和机械强度仍然是挑战。这项工作根据其热、机械和形态方面评估了用纤维素纳米纤维 (CNF) 增强的 K-卡拉胶/海藻酸盐薄膜 (Kc/Alg)。扫描电子显微镜显示 CNF 纠缠和改善的沿基体分散，显示出基本的单相微观结构。这种结构决定了增强的性能，如水溶性、热稳定性和机械阻力。此外，我们在不添加增塑剂的情况下，CNF 复合材料的最大拉伸强度达到了 58.9 MPa。

图形概要