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Specific fracture energy (G Ic) of adhesively bonded joints. Two urea–formaldehyde-(UF)-adhesives were applied without any additional filler (REF) and filled with cellulose nanofibrils from different sources (P1 untreated pulp, P2 TEMPO-oxidized pulp, BC bacterial cellulose). Boxplot symbols: broad line median, box 25–75%-percentile, whiskers minimum and maximum value. The number of specimens tested for each group is given by N
