The presence of BC also enhanced the nucleation and growth of crystals in PLA. We further produced PLA fibres with
7 wt.% cellulose nanocrystals (CNCs), which is higher than the percolation threshold (equivalent to
6 vol.%). These fibres were spun in multiple, alternating controlled layers onto spools, and subsequently
compression moulded to produce unidirectional self-reinforced PLA composites consisting of 60 vol.%
PLLA fibres reinforced with 7 wt.% CNC in a matrix of amorphous PDLLA, which itself contained 7 wt.%
of CNC. We observed improvements in viscoelastic properties of up to 175% in terms of storage moduli
in bending. Furthermore, strains to failure for PLLA fibre reinforced PDLLA were recorded at 17%.