*Article* **The Potential Use of Seaweed (***Posidonia oceanica***) as an Alternative Lignocellulosic Raw Material for Wood Composites Manufacture**

**Ekaterini Rammou 1, Andromachi Mitani 1, George Ntalos 1, Dimitrios Koutsianitis 1, Hamid R. Taghiyari <sup>2</sup> and Antonios N. Papadopoulos 3,\***


**Abstract:** A big challenge in the composites industry is the availability of cheap raw lignocellulosic materials, potential candidates to replace slow growing trees, in order to minimize the production cost. Therefore, a variety of plants were studied and tested worldwide in composites manufacturing. The objective of this study was to investigate the technical feasibility of manufacturing particleboards from seaweed leaves (*Possidonia oceanica*—PO). The use of such a material may benefit both socioeconomic and environmental development since these leaves settle on seashores and decay. The results showed that an incorporation of up to 10% PO leaves did not significantly affect the mechanical properties of the board. Internal bond strength was more severely affected than the other mechanical properties. The incorporation of PO leaves up to 25% did not significantly improve the dimensional stability of the boards. Markedly, boards made from 50% wood particles and 50% PO leaves showed the best thickness swelling values. It is suggested that higher resin dosage and an alternative resin system, such as isocyanates, may improve the panel properties.

**Keywords:** seaweeds; *Posidonia oceanica*; lignocellulosic materials; wood composite panels
