Effect of High Pressure Treatment on Poly(lactic acid)/Nano–TiO2 Composite Films

Chi, Hai; Li, Wenhui; Fan, Cunzheng; Zhang, Cheng; Lin, Li-Rong; Qin, Yuyue; Yuan, Minglong

doi:10.3390/molecules23102621

“…Such results were reflected in the new clay‐based nanocomposites reported by Sanchez‐Garcia and Lagaron 34 . Some studies have reported similar behavior of PLA nanocomposites filled with nano‐TiO 2 , in which OP was significantly reduced when 50 g kg −1 nano‐ZnO was loaded 35 …”

Section: Resultsmentioning

confidence: 53%

Effect of ultrahigh‐pressure treatment on the functional properties of poly(lactic acid)/ZnO nanocomposite food packaging film

Cui

¹

,

Fan

²

,

Dong

³

et al. 2021

Self Cite

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BACKGROUND Our living environment is being increasingly polluted by petroleum‐based plastics and there is an increasing demand for biodegradable food packaging. In this study, the effect of various ultrahigh‐pressure (UHP) treatments (0, 200 and 400 MPa) on the microstructure and thermal, barrier and mechanical properties of poly(lactic acid) (PLA)/ZnO nanocomposite films was studied. RESULTS The film‐forming solution was processed using UHP technology. The crystallinity, strength and stiffness of the composite film after UHP treatment increased. In addition, barrier property analysis showed that the UHP treatment significantly (P < 0.05) reduced the oxygen permeability and water vapor permeability (WVP) coefficient of the PLA/ZnO nanocomposite film. Furthermore, the WVP value of the film treated at 400 MPa (50 g kg−1 nano‐ZnO content) was the lowest and reduced by 47.3% compared with that of pure PLA film. The improvement in these properties might be due to the interaction between nano‐ZnO and PLA matrix promoted by UHP treatment. CONCLUSIONS Therefore, the application of UHP technology on the film‐forming solution could improve the crystallinity and functional properties of the nanocomposite film, and has great potential in the production of food packaging films with ideal functions. © 2021 Society of Chemical Industry

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“…The surface and other mechanical properties of products made from PLA or composite filaments were investigated previously ( Graupner, Herrmann & Müssig, 2009 ; Chi et al, 2018 ; Ivanov et al, 2019 ; Wang et al, 2016 ). However, the microstructure of 3D-printed PLA objects is highly dependent on the printing parameters, and it is not possible to predict the structure and porosity of a particular object based on published data.…”

Section: Discussionmentioning

confidence: 99%

Polylactic acid as a suitable material for 3D printing of protective masks in times of COVID-19 pandemic

Vaňková

¹

,

Kašparová

²

,

Khun

³

et al. 2020

PeerJ

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A critical lack of personal protective equipment has occurred during the COVID-19 pandemic. Polylactic acid (PLA), a polyester made from renewable natural resources, can be exploited for 3D printing of protective face masks using the Fused Deposition Modelling technique. Since the possible high porosity of this material raised questions regarding its suitability for protection against viruses, we have investigated its microstructure using scanning electron microscopy and aerosol generator and photometer certified as the test system according to the standards EN 143 and EN 149. Moreover, the efficiency of decontaminating PLA surfaces by conventional chemical disinfectants including 96% ethanol, 70% isopropanol, and a commercial disinfectant containing 0.85% sodium hypochlorite has been determined. We confirmed that the structure of PLA protective masks is compact and can be considered a sufficient barrier protection against particles of a size corresponding to microorganisms including viruses. Complete decontamination of PLA surfaces from externally applied Staphylococcus epidermidis, Escherichia coli, Candida albicans and SARS-CoV-2 was achieved using all disinfectants tested, and human adenovirus was completely inactivated by sodium hypochlorite-containing disinfectant. Natural contamination of PLA masks worn by test persons was decontaminated easily and efficiently by ethanol. No disinfectant caused major changes to the PLA surface properties, and the pore size did not change despite severe mechanical damage of the surface. Therefore, PLA may be regarded as a suitable material for 3D printing of protective masks during the current or future pandemic crises.

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“…1). The surface and other mechanical properties of products made from PLA or composite filaments were investigated previously (Graupner et al 2009;Chi et al 2018;Ivanov et al 2019;Wang et al 2016). However, the microstructure of 3D-printed PLA objects is highly dependent on the printing parameters, and it is not possible to predict the structure and porosity of a particular object based on published data.…”

Section: Discussionmentioning

confidence: 99%

Peer Review #2 of "Polylactic acid as a suitable material for 3D printing of protective masks in times of COVID-19 pandemic (v0.1)"

Arjoca¹

2020

0

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A critical lack of personal protective equipment has occurred during the COVID-19 pandemic. Polylactic acid (PLA), a polyester made from renewable natural resources, can be exploited for 3D printing of protective face masks using the Fused Deposition Modelling technique. Since the possible high porosity of this material raised questions regarding its suitability for protection against viruses, we have investigated its microstructure using scanning electron microscopy and aerosol generator and photometer certified as the test system according to the standards EN 143 and EN 149. Moreover, the efficiency of decontaminating PLA surfaces by conventional chemical disinfectants including 96% ethanol, 70% isopropanol, and a commercial disinfectant containing 0.85% sodium hypochlorite has been determined. We confirmed that the structure of PLA protective masks is compact and can be considered a sufficient barrier protection against particles of a size corresponding to microorganisms including viruses. Complete decontamination of PLA surfaces from externally applied Staphylococcus epidermidis, Escherichia coli, Candida albicans and SARS-CoV-2 was achieved using all disinfectants tested, and human adenovirus was completely inactivated by sodium hypochlorite-containing disinfectant. Natural contamination of PLA masks worn by test persons was decontaminated easily and efficiently by ethanol. No disinfectant caused major changes to the PLA surface properties, and the pore size did not change despite severe mechanical damage of the surface. Therefore, PLA may be regarded as a suitable material for 3D printing of protective masks during the current or future pandemic crises.

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Effect of High Pressure Treatment on Poly(lactic acid)/Nano–TiO2 Composite Films

Cited by 13 publications

References 36 publications

Effect of ultrahigh‐pressure treatment on the functional properties of poly(lactic acid)/ZnO nanocomposite food packaging film

Effect of ultrahigh‐pressure treatment on the functional properties of poly(lactic acid)/ZnO nanocomposite food packaging film

Polylactic acid as a suitable material for 3D printing of protective masks in times of COVID-19 pandemic

Peer Review #2 of "Polylactic acid as a suitable material for 3D printing of protective masks in times of COVID-19 pandemic (v0.1)"

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