SEM micrographs of PLA based biocomposites reinforced with (a) 5 wt% untreated coir fibres, (b) 5 wt% treated coir fibres, (c) 10 wt% untreated coir fibres, (d) 10 wt% treated coir fibres, (e) 20 wt% untreated coir fibres, (f) 20 wt% treated coir fibres, (g) 30 wt% untreated coir fibres and (h) 30 wt% treated coir fibres. The scale bars represent 200 μm.