The biomaterial wood is a popular construction material for outdoor application. To protect the wood surface against weathering effects and microorganisms and avoid related degradation processes, protective coatings are necessary. Various organic and inorganic additives are introduced to such coating systems, tailored to give special functionalities, to achieve a better performance and obtain a longer durability. Nanofibrillated cellulose (NFC) is considered as a new multifunctional organic component to enhance coating performance and durability. NFC, isolated from the wood cell wall, consists of a network of interconnected cellulose microfibril aggregates, with high specific strength and modulus. It can possibly act as rheology modifier, mechanically reinforcing component and as carrier substance for functional agents such as UV absorbers or biocides.
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