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SEM micrographs of pure PVA and PVA-(L)CNF films. (a) the surface of pure PVA, PVA containing 7.5% of mechanical unbleached nanocellulose (7.5% MU), PVA containing 7.5% of mechanical bleached nanocellulose (7.5% MB), PVA containing 7.5% of TEMPO unbleached nanocellulose (7.5% TU), PVA containing 7.5% of TEMPO bleached nanocellulose (7.5% TB); (b) cross section of pure PVA and PVA containing 7.5% of mechanical bleached nanocellulose (7.5% MB). Taken from Sánchez et al. [24].
