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The SEM images of fractured surfaces of biochar filled polypropylene composites (a) 3 MAPP (b) 2 MAPP (c) 1 MAPP (d) 0 MAPP, the images show mechanical interlocking between the filler and the matrix polymer even at 1% concentration of compatibilizer attributed to its excellent mechanical properties. Figure taken from [42] with permission to use from Elsevier Publications 2016.
