Poly(lactic acid) (PLA) and poly(butylene adipate/terephthalate) (PBAT) were used for polymer alloys, and the e?ects of the mixing ratio of PLA and PBAT and the addition of dialkyl peroxide (compatibilizing agent) were examined. The stress-strain curves of PLA/PBAT and PLA/PBAT/dialkyl peroxide specimens were measured using a tensile split Hopkinson bar (Kolsky Bar) method and a universal testing machine. The mixing ratio of PLA and PBAT and the dialkyl peroxide addition a?ected the shape of the stress-strain curve behavior. Regardless of the strain rate, the yield stress decreased and the elongation at break and strain energy increased with increasing PBAT content when the dialkyl peroxide was used. At high strain rate, the dialkyl peroxide addition increased the elongation at break and the strain energy, and changed the fracture surface to a whitened form that was markedly uneven. This result could explain the improvement in the Izod impact strength.
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Poly(lactic acid) (PLA) is a biodegradable biomass polymer. Polymer blends or polymer al- loys 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. Di?erent 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 a?ected the stress-strain curves. Yield stress decreased with increasing PBAT ratios. Addition of dialkylper- oxide 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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