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Mechanical and antibacterial properties of oriented poly(lactic acid)

Polylactic acid (PLA) is a kind of biodegradable polymer that has applications in a wide range of biomedical fields and food?contact packaging. However, the mechanical disadvantage limits the application of PLA?based material. The present study modified the pure PLA by orientation and investigated its mechanical and antibacterial properties. The crystallinity and the tensile strength were both drawing ratio dependent. They increased along with the draw ratio to a maximum value of 600% and then decreased. The antibacterial effect of PLA against Staphylococcus aureus and Vibrio paraemolyicus both first increased and then decreased along with the drawing ratio, reaching their highest effect at the drawing ratio of 600%. The inhibition effect of PLA reduced generally with the aging days. According to SEM images, the grape?like clusters structure of S. aureus was hardly observed and the cell structure damaged on the surface of PLA?600%, while significant changes of the morphology of V. paraemolyicus were not observed. POLYM. ENG. SCI., 2019. © 2019 Society of Plastics Engineers

Publication date: 14/08/2019

Author: Zhengqiu Li, Lei Liu, Yu Rao, Longchang Ran, Ting Wu, Rong Nie, De Schutter Anna, Yalin Li, Zhenming Che

Reference: doi:10.1002/pen.25208

Polymer Engineering and Science


This project has received funding from the Bio Based Industries Joint Undertaking under the European Union’s Horizon 2020 research and innovation programme under grant agreement No 837761.