The dissolved N2 and the addition of NBSK and MDF fibers
affected the crystallization kinetics of PLA. From high-pressure
DSC analysis, the pressurized N2 increased the degree of crystallinity of all PLA samples despite its little effect on the crystallization temperature and half-time. The presence of cellulosic fibers,
especially NBSK, significantly increased the crystallization temperature and degree of crystallinity and decreased the crystallization
half-time. In the foam injection molding process, the shear stress
and biaxial stretching significantly enhanced the final degree of
crystallinity of the foamed fiber composites by aligning the PLA
molecules along the fibers