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Materials 2017, 10(6), 659; doi:10.3390/ma10060659

Characterization of Antimicrobial Poly (Lactic Acid)/Nano-Composite Films with Silver and Zinc Oxide Nanoparticles

1
Institute of Yunnan Food Safety, Kunming University of Science and Technology, Kunming 650550, China
2
College of Light Industry and Food Science, South China University of Technology, Guangzhou 510640, China
*
Authors to whom correspondence should be addressed.
Received: 8 May 2017 / Revised: 2 June 2017 / Accepted: 14 June 2017 / Published: 16 June 2017
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Abstract

Antimicrobial active films based on poly (lactic acid) (PLA) were prepared with nano-silver (nano-Ag) and nano-zinc oxide (nano-ZnO) using a solvent volatilizing method. The films were characterized for mechanical, structural, thermal, physical and antimicrobial properties. Scanning electron microscopy (SEM) images characterized the fracture morphology of the films with different contents of nano-Ag and nano-ZnO. The addition of nanoparticles into the pure PLA film decreased the tensile strength and elasticity modulus and increased the elongation of breaks—in other words, the flexibility and extensibility of these composites improved. According to the results of differential scanning calorimetry (DSC), the glass transition temperature of the PLA nano-composite films decreased, and the crystallinity of these films increased; a similar result was apparent from X-ray diffraction (XRD) analysis. The water vapor permeability (WVP) and opacity of the PLA nano-composite films augmented compared with pure PLA film. Incorporation of nanoparticles to the PLA films significantly improved the antimicrobial activity to inhibit the growth of Escherichia coli. The results indicated that PLA films with nanoparticles could be considered a potential environmental-friendly packaging material. View Full-Text
Keywords: poly (lactic acid); nanoparticle; thermal properties; mechanical property; antimicrobial property poly (lactic acid); nanoparticle; thermal properties; mechanical property; antimicrobial property
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Chu, Z.; Zhao, T.; Li, L.; Fan, J.; Qin, Y. Characterization of Antimicrobial Poly (Lactic Acid)/Nano-Composite Films with Silver and Zinc Oxide Nanoparticles. Materials 2017, 10, 659.

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