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A poly (L-lactic acid) (PLLA) film, which was blended with baked shell powder, was made and the antibacterial ability, biodegradability and physical properties of it were evaluated. The PLLA film blended with the powder had no antibacterial ability although the PLLA itself had strong antibacterial ability. Moreover the biodegradation rate was faster by blending the powder in PLLA film, and in the thermal and mechanical properties, which are obtained by differential scanning calorimeter (DSC) and tensile tests, there was slightly difference between the unblended PLLA film and the blended PLLA film. So, these results suggest that the antibacterial ability of PLLA is caused by lactic acid which is created in hydrolysis and that the powder neutrizes the lactic acid.

Antibacterial Ability and Physical Properties of Poly (L-lactic acid) Film Blended with Baked Shell Powder