“…Thereby, waterborne polyurethanes (WBPU) have gained attention due to their ability to assemble in stable particles in water dispersions by the addition of a covalently bonded internal emulsifier (Chattopadhyay & Raju, 2007;Nelson & Long, 2014). In this way, besides obtaining environmentally-friendly polyurethanes, water dispersible reinforcement incorporation such as cellulose nanocrystals (CNC) is facilitated (Gopiraman et al, 2016;Kushwaha, Avadhani, & Singh, 2015;Mariano, El Kissi, & Dufresne, 2014;Zhang et al, 2014;Zhou et al, 2016). Cellulose is one of the most abundant polymers in nature, which can be obtained from different sources like plants, bacteria or tunicates that, attending to the applied treatments lead to diverse forms like fibers or crystals, from the macro to the nanoscale (Eichhorn et al, 2010;Hribernik et al, 2016;Kunaver, Anzlovar, & Zagar, 2016;Tuzzin, Godinho, Dettmer, & Zattera, 2016;Xiang, Mohammed, & Baharuddin, 2016).…”