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Melt Extrusion of Environmentally Friendly Poly(L-lactic acid)/Sodium Metabisulfite Films for Antimicrobial Packaging Applications

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Journal of Renewable Materials 2021年第2期9卷 337-349页

作者： Norma M.P.Machado Gustavo C.Melo Matheus F.Camargo Giulianna G.Feijó Bruna M.S.Putton Clarice Steffens Rogerio L.Cansian luiz a.pessan Francys K.V.Moreira Department of Materials Engineering Federal University of São CarlosSão CarlosBrazil Department of Food Engineering Regional Integrated University of High Uruguay and Missions(URI)ErechimBrazil

Food packaging materials compounded with antimicrobial additives can substantially diminish the incidence of foodborne ***,poly(L-lactic acid)(PLA)films containing sodium metabisulfite(NaM)were produced by melt extrusion as an attempt to develop a new biodegradable material with antimicrobial properties for *** cycle assessment(LCA)simulations revealed that the environmental footprints of the PLA film did not change upon NaM addition,and that NaM is more eco-friendly than silver *** PLA/NaM films with NaM content varying from 0.5 to 5.0 wt.%were characterized by differential scanning calorimetry(DSC),thermogravimetric analysis(TGA),and optical and mechanical properties *** optical properties were sustained after the addition of NaM,but high NaM contents degraded the light transparence of the PLA matrix at some *** thermal stability and tensile properties of the PLA film decreased proportionally to the NaM content,while no changes were observed on Tg,Tm and Xc,as determined by *** diffusion tests revealed that the PLA/NaM films had no antimicrobial activity on Saccharomyces cerevisiae at 35°C,which was related to the limited migration of NaM from the glassy PLA *** biodegradable PLA films compounded with NaM through melt extrusion display adequate optical,thermal,and mechanical properties to cover most food packaging applications,representing an essential step toward the development of eco-friendly packaging materials that can potentially exhibit an antimicrobially active surface.

关键词： Biobased packaging antimicrobial activity life cycle assessment

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Novel LDPE/EVA Nanocomposites with Silver/Titanium Dioxide Particles for Biomedical Applications

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材料科学与工程（中英文B版） 2011年第4期1卷 516-522页

作者： Gabriel Molina de Olyveira Ligia Maria Manzine Costa Ant6nio Joss Felix de Carvalho Pierre Basmaji luiz Antonio pessan Department of Materials Engineering-Polymers Federal University of S6o Carlos-UFSCar 13565-905 S6o Carlos SP Brazil Department of Materials Engineering S6o Paulo University 13566-590 S6o Carlos SP Brazil Innovatec ＇s-Biotechnology Research and Development Sao Carlos SP Brazil

Nanocomposites with antimicrobial activity are of great interest nowadays and the development of titanium dioxide with these functional properties presents interest in academic and industrial sectors. An approach to develop PE nanocomposite containing Ag nanoparticles to have an antimicrobial effect is presented. To obtain such antimicrobial nanocomposites, LDPE/EVA were processed with Ag nanoparticles on TiO2 particles as inorganic carrier substance. Titanium dioxide nanoparticles (P-25) were covered with silver nanoparticles using Turkevich Method or citrate reduction method. The Ag/TiO2 nanoparticles were dispersed at concentration of 0.5 wt%, 0.8 wt% and 1 wt% in LDPE/ethylene vinyl acetate copolymer (EVA)-(50% w/w) at the melt state in a Haake torque Rheometer. Silver nanoparticles were characterized with UV-Vis Spectroscopy. The nanocomposites thus prepared were characterized through Ares Rheometer, Scanning Electronic Microscopy (SEM) and JIS Z 2801 antimicrobial tests to study the effects of the addition of nanoparticles on rheological properties, morphological behavior and antimicrobial properties. The results showed that incorporation of silver/titanium dioxide nanoparticles on nanocomposites obtained systems with different dispersions. The Ag/TiO2 particles showed uniform distribution of Ag on TiO2 particles as observed by SEM-EDX and antimicrobial tests according to JIS Z 2801 shows excellent antimicrobial properties.

关键词：纳米复合材料二氧化钛颗粒 LDPE 生物医学应用 EVA 含银二氧化钛纳米粒子聚乙烯复合材料

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