Vacuum compression molding and solid-state extrusion technique were employed for the enhancement of mechanical properties of PLLA. Throughout the whole processes, the decrease in molecular weight was effectively suppressed to be about 10%. Flexural modulus and strength were increased up to 8.3 GPa and 221 MPa, respectively. With increasing billet crystallinity, draw ratio, and drawing rate, both flexural modulus and flexural strength of extruded PLLA increased, which was due to the developments in orientation and crystallinity.
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