Engineering Transactions, 59, 1, pp. 23–30, 2011

Evaluation of Dynamic Compressive Properties of Pla/Pbat Polymer Alloys Using Split Hopkinson Pressure Bar Method

Department of Mechanical Engineering, Nagoya Institute of Technology

Department of Mechanical Engineering, Nagoya Institute of Technology

Aichi Industrial Technology Institute

Poly(lactic acid) (PLA) is a biodegradable biomass polymer. Polymer blends or polymer alloys
have been used to overcome its brittleness. Because poly(butylene/adipate/terephthalate)
(PBAT) is a ductile and biodegradable polymer, PLA/PBAT polymer alloys can potentially
exhibit high impact strengths. Different mixing ratios of PLA/PBAT (80:20, 70:30 and 60:40)
and the addition of dialkylperoxide as compatibilizing agent for each mixing ratio have been
examined. The stress-strain curves of the PLA/PBAT specimens (observed using a scanning
electron microscope) were measured using a split Hopkinson pressure bar (Kolsky bar) and
a universal testing machine. The PBAT ratios and addition of dialkylperoxide affected the
stress-strain curves. Yield stress decreased with increasing PBAT ratios. Addition of dialkylperoxide
did not change the yield stress of specimens when PLA:PBAT = 80:20. At high strain
rates, the addition of dialkylperoxide clearly reduced yield stress and Young’s modulus when
PLA: PBAT = 70:30 and 60:40.
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