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Bottom-Up Development of Nanoimprinted PLLA Composite Films with Enhanced Antibacterial Properties for Smart Packaging Applications

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Laboratory of Polymer Chemistry and Technology, Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
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Laboratory of Chemical and Environmental Technology, Department of Chemistry, Aristotle, University of Thessaloniki, 54124 Thessaloniki, Greece
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Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, 08193 Barcelona, Spain
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Digital Manufacturing and Materials Characterization Laboratory, School of Science and Technology, International Hellenic University, Thermi, 57001 Thessaloniki, Greece
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3B’s Research Group, I3B’s—Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine AvePark, Zona Industrial da Gandra, Barco, 4805-017 Guimarães, Portugal
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ICVS/3B’s—PT Government Associate Laboratory, University of Minho, 4710-057 Bragas, Portugal
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ICREA, Pg. Lluís Companys 23, 08010 Barcelona, Spain
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Institute of Nanoscience and Nanotechnology, NCSR Demokritos, 15341 Paraskevi, Greece
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Author to whom correspondence should be addressed.
Received: 13 February 2021 / Revised: 5 March 2021 / Accepted: 9 March 2021 / Published: 11 March 2021
(This article belongs to the Special Issue Polymer-Based Nanomaterials)
In this work, polymer nanocomposite films based on poly(L-lactic acid) (PLLA) were reinforced with mesoporous silica nanoparticles, mesoporous cellular foam (MCF) and Santa Barbara amorphous-15 (SBA). PLLA is a biobased aliphatic polyester, that possesses excellent thermomechanical properties, and has already been commercialized for packaging applications. The aim was to utilize nanoparticles that have already been established as nanocarriers to enhance the mechanical and thermal properties of PLLA. Since the introduction of antibacterial properties has become an emerging trend in packaging applications, to achieve an effective antimicrobial activity, micro/nano 3D micropillars decorated with cone- and needle-shaped nanostructures were implemented on the surface of the films by means of thermal nanoimprint lithography (t-NIL), a novel and feasible fabrication technique with multiple industrial applications. The materials were characterized regarding their composition and crystallinity using Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD), respectively, and their thermal properties using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Their mechanical properties were examined by the nanoindentation technique, while the films’ antimicrobial activity against the bacteria Escherichia coli and Staphylococcus aureus strains was tested in vitro. The results demonstrated the successful production of nanocomposite PLLA films, which exhibited improved mechanical and thermal properties compared to the pristine material, as well as notable antibacterial activity, setting new groundwork for the potential development of biobased smart packaging materials. View Full-Text
Keywords: poly(L-lactic acid); biobased polymers; mesoporous silica; nanocomposite films; nanoimprint lithography; antibacterial properties; smart packaging poly(L-lactic acid); biobased polymers; mesoporous silica; nanocomposite films; nanoimprint lithography; antibacterial properties; smart packaging
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MDPI and ACS Style

Psochia, E.; Papadopoulos, L.; Gkiliopoulos, D.J.; Francone, A.; Grigora, M.-E.; Tzetzis, D.; de Castro, J.V.; Neves, N.M.; Triantafyllidis, K.S.; Torres, C.M.S.; Kehagias, N.; Bikiaris, D.N. Bottom-Up Development of Nanoimprinted PLLA Composite Films with Enhanced Antibacterial Properties for Smart Packaging Applications. Macromol 2021, 1, 49-63. https://0-doi-org.brum.beds.ac.uk/10.3390/macromol1010005

AMA Style

Psochia E, Papadopoulos L, Gkiliopoulos DJ, Francone A, Grigora M-E, Tzetzis D, de Castro JV, Neves NM, Triantafyllidis KS, Torres CMS, Kehagias N, Bikiaris DN. Bottom-Up Development of Nanoimprinted PLLA Composite Films with Enhanced Antibacterial Properties for Smart Packaging Applications. Macromol. 2021; 1(1):49-63. https://0-doi-org.brum.beds.ac.uk/10.3390/macromol1010005

Chicago/Turabian Style

Psochia, Eleni, Lazaros Papadopoulos, Dimitrios J. Gkiliopoulos, Achille Francone, Maria-Eirini Grigora, Dimitrios Tzetzis, Joana V. de Castro, Nuno M. Neves, Konstantinos S. Triantafyllidis, Clivia M.S. Torres, Nikolaos Kehagias, and Dimitrios N. Bikiaris 2021. "Bottom-Up Development of Nanoimprinted PLLA Composite Films with Enhanced Antibacterial Properties for Smart Packaging Applications" Macromol 1, no. 1: 49-63. https://0-doi-org.brum.beds.ac.uk/10.3390/macromol1010005

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