期刊
JOURNAL OF APPLIED POLYMER SCIENCE
卷 139, 期 4, 页码 -出版社
WILEY
DOI: 10.1002/app.51542
关键词
biomaterials; biopolymers and renewable polymers; differential scanning calorimetry; molding
资金
- DICYT [022041ZR_POSTDOCT]
- Fondo Nacional de Desarrollo Cientifico y Tecnologico [1170226, 3200296]
The antimicrobial films of poly (lactic acid) (PLA)/D-limonene/zinc oxide (ZnO) bio-nanocomposites were prepared and showed excellent antimicrobial performance. Despite a decrease in thermal stability and microhardness, the addition of D-limonene and zinc oxide nanoparticles enhanced the antimicrobial properties of the materials.
Antimicrobial films of poly (lactic acid) (PLA)/D-limonene/zinc oxide (ZnO)-based bio-nanocomposites were prepared via melt compounding and subsequent thermocompression. D-limonene was incorporated at concentrations of 10 or 20 wt%, and ZnO pure nanoparticles and those organically modified with oleic acid (O-ZnO), with an average diameter of 13.5 nm, were included at concentrations of 3, 5, and 8 wt%. The plasticizing effect of D-Limonene was corroborated by a decrease in the glass transition temperature compared to pure PLA. The presence of ZnO and O-ZnO in the PLA matrix promoted a slight increase in the degree of crystallinity due to its nucleant performance. Although ZnO and O-ZnO induced lower thermal stability and slightly decreased microhardness in the composites, excellent antimicrobial performance was demonstrated. Both ZnO and O-ZnO nanocomposites reached 99.9% of effectiveness for nanoparticles content above 5 wt%, regardless of the source of irradiation, D-limonene concentration, and nanoparticle modification. Therefore, these bio-nanocomposites will allow for future advances in sustainable antimicrobial materials for the medical or food packaging fields.
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