The Experts below are selected from a list of 22719 Experts worldwide ranked by ideXlab platform
Lucie Delaunay - One of the best experts on this subject based on the ideXlab platform.
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Effect of gamma irradiation on the oxygen barrier properties in ethyl-vinyl acetate/ethylene-vinyl alcohol/ ethyl-vinyl acetate Multilayer Film
Journal of Applied Polymer Science, 2020Co-Authors: Samuel Dorey, Nathalie Dupuy, Fanny Gaston, Sylvain R. A. Marque, Nina Girard-perier, Lucie DelaunayAbstract:The potential changes of single-use plastic materials (EVA/EVOH/EVA multi-layer Film in this study) used in biopharmaceutical and food-packaging industries are investigated after several gamma irradiation doses: 30, 50, 115, and 270 kGy, and for nonsterilized samples (0 kGy) from a point of view of mechanical properties, thermal properties and permeability properties. Tensile tests, differential scanning calorimetry (DSC), oxygen transmission rate (OTR) and water vapor transmission rate (WVTR) are performed on the Multilayer Film. For irradiation doses below 50 kGy, thermal and water vapor barrier properties are not altered. For higher doses (50 to 270 kGy), mechanical, thermal and water vapor barrier properties are slightly altered whereas oxygen barrier property decreases from 13 to 27 cm 3 .m −2 .day −1. This slight change is shown not to happen due to chain entanglement or chain mobility loss in the amorphous phase of the different polymers. It rather comes from a change of the chemical environment of the EVOH layer.
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Generation of O 2 -Permeation Barrier during the Gamma-Irradiation of Polyethylene/Ethylene-Vinyl Alcohol/Polyethylene Multilayer Film
Industrial and engineering chemistry research, 2019Co-Authors: Samuel Dorey, Nathalie Dupuy, Fanny Gaston, Sylvain R. A. Marque, Nina Girard-perier, Lucie DelaunayAbstract:Polymers such as polyethylene (PE) and ethylene vinyl alcohol (EVOH) are primary constituents of Multilayer Films used in the food and biopharmaceutical packaging. In order to explore the Film behavior after gamma-sterilization, several tests are performed (tensile tests, differential scanning calorimetry (DSC), oxygen transmission rate (OTR) and water vapor transmission rate (WVTR). The investigation of the PE/EVOH/PE Multilayer Film is done at several gamma-irradiation doses up to 270 kGy. For irradiation dose up to 50 kGy, mechanical properties are not altered. Whatever the irradiation dose, water barrier in PE/ EVOH/PE Multilayer Film is not altered whereas the oxygen barrier property is increased by 300%. This enhancement is shown not to occur due to reorientation, closer chain packaging and restriction of chain mobility of polymer chains in the amorphous phase of the different polymers. This enhancement rather comes from a change of the chemical environment of the EVOH layer.
Samuel Dorey - One of the best experts on this subject based on the ideXlab platform.
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Effect of gamma irradiation on the oxygen barrier properties in ethyl-vinyl acetate/ethylene-vinyl alcohol/ ethyl-vinyl acetate Multilayer Film
Journal of Applied Polymer Science, 2020Co-Authors: Samuel Dorey, Nathalie Dupuy, Fanny Gaston, Sylvain R. A. Marque, Nina Girard-perier, Lucie DelaunayAbstract:The potential changes of single-use plastic materials (EVA/EVOH/EVA multi-layer Film in this study) used in biopharmaceutical and food-packaging industries are investigated after several gamma irradiation doses: 30, 50, 115, and 270 kGy, and for nonsterilized samples (0 kGy) from a point of view of mechanical properties, thermal properties and permeability properties. Tensile tests, differential scanning calorimetry (DSC), oxygen transmission rate (OTR) and water vapor transmission rate (WVTR) are performed on the Multilayer Film. For irradiation doses below 50 kGy, thermal and water vapor barrier properties are not altered. For higher doses (50 to 270 kGy), mechanical, thermal and water vapor barrier properties are slightly altered whereas oxygen barrier property decreases from 13 to 27 cm 3 .m −2 .day −1. This slight change is shown not to happen due to chain entanglement or chain mobility loss in the amorphous phase of the different polymers. It rather comes from a change of the chemical environment of the EVOH layer.
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Generation of O 2 -Permeation Barrier during the Gamma-Irradiation of Polyethylene/Ethylene-Vinyl Alcohol/Polyethylene Multilayer Film
Industrial and engineering chemistry research, 2019Co-Authors: Samuel Dorey, Nathalie Dupuy, Fanny Gaston, Sylvain R. A. Marque, Nina Girard-perier, Lucie DelaunayAbstract:Polymers such as polyethylene (PE) and ethylene vinyl alcohol (EVOH) are primary constituents of Multilayer Films used in the food and biopharmaceutical packaging. In order to explore the Film behavior after gamma-sterilization, several tests are performed (tensile tests, differential scanning calorimetry (DSC), oxygen transmission rate (OTR) and water vapor transmission rate (WVTR). The investigation of the PE/EVOH/PE Multilayer Film is done at several gamma-irradiation doses up to 270 kGy. For irradiation dose up to 50 kGy, mechanical properties are not altered. Whatever the irradiation dose, water barrier in PE/ EVOH/PE Multilayer Film is not altered whereas the oxygen barrier property is increased by 300%. This enhancement is shown not to occur due to reorientation, closer chain packaging and restriction of chain mobility of polymer chains in the amorphous phase of the different polymers. This enhancement rather comes from a change of the chemical environment of the EVOH layer.
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One year monitoring by FTIR of γ-irradiated Multilayer Film PE/EVOH/PE
Radiation Physics and Chemistry, 2016Co-Authors: Fanny Gaston, Magali Barbaroux, Nathalie Dupuy, Sylvain R. A. Marque, Samuel DoreyAbstract:The Multilayer Films made of polyethylene/polyethylene-co-vinyl alcohol/polyethylene are γ-irradiated for biopharmaceutical and biotechnological applications. The radiations generate changes in the polymer Films. In this study, we focused on the modifications produced on the surface of materials by Fourier transformed infrared (FTIR) spectroscopy combined with chemometric treatments. Principal component analysis (PCA) allows the ordering of the surface modifications according to absorbed doses and the natural ageing. Results show the rising of the acid band and the variation of unsaturated compounds.
Fanny Gaston - One of the best experts on this subject based on the ideXlab platform.
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Effect of gamma irradiation on the oxygen barrier properties in ethyl-vinyl acetate/ethylene-vinyl alcohol/ ethyl-vinyl acetate Multilayer Film
Journal of Applied Polymer Science, 2020Co-Authors: Samuel Dorey, Nathalie Dupuy, Fanny Gaston, Sylvain R. A. Marque, Nina Girard-perier, Lucie DelaunayAbstract:The potential changes of single-use plastic materials (EVA/EVOH/EVA multi-layer Film in this study) used in biopharmaceutical and food-packaging industries are investigated after several gamma irradiation doses: 30, 50, 115, and 270 kGy, and for nonsterilized samples (0 kGy) from a point of view of mechanical properties, thermal properties and permeability properties. Tensile tests, differential scanning calorimetry (DSC), oxygen transmission rate (OTR) and water vapor transmission rate (WVTR) are performed on the Multilayer Film. For irradiation doses below 50 kGy, thermal and water vapor barrier properties are not altered. For higher doses (50 to 270 kGy), mechanical, thermal and water vapor barrier properties are slightly altered whereas oxygen barrier property decreases from 13 to 27 cm 3 .m −2 .day −1. This slight change is shown not to happen due to chain entanglement or chain mobility loss in the amorphous phase of the different polymers. It rather comes from a change of the chemical environment of the EVOH layer.
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Generation of O 2 -Permeation Barrier during the Gamma-Irradiation of Polyethylene/Ethylene-Vinyl Alcohol/Polyethylene Multilayer Film
Industrial and engineering chemistry research, 2019Co-Authors: Samuel Dorey, Nathalie Dupuy, Fanny Gaston, Sylvain R. A. Marque, Nina Girard-perier, Lucie DelaunayAbstract:Polymers such as polyethylene (PE) and ethylene vinyl alcohol (EVOH) are primary constituents of Multilayer Films used in the food and biopharmaceutical packaging. In order to explore the Film behavior after gamma-sterilization, several tests are performed (tensile tests, differential scanning calorimetry (DSC), oxygen transmission rate (OTR) and water vapor transmission rate (WVTR). The investigation of the PE/EVOH/PE Multilayer Film is done at several gamma-irradiation doses up to 270 kGy. For irradiation dose up to 50 kGy, mechanical properties are not altered. Whatever the irradiation dose, water barrier in PE/ EVOH/PE Multilayer Film is not altered whereas the oxygen barrier property is increased by 300%. This enhancement is shown not to occur due to reorientation, closer chain packaging and restriction of chain mobility of polymer chains in the amorphous phase of the different polymers. This enhancement rather comes from a change of the chemical environment of the EVOH layer.
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One year monitoring by FTIR of γ-irradiated Multilayer Film PE/EVOH/PE
Radiation Physics and Chemistry, 2016Co-Authors: Fanny Gaston, Magali Barbaroux, Nathalie Dupuy, Sylvain R. A. Marque, Samuel DoreyAbstract:The Multilayer Films made of polyethylene/polyethylene-co-vinyl alcohol/polyethylene are γ-irradiated for biopharmaceutical and biotechnological applications. The radiations generate changes in the polymer Films. In this study, we focused on the modifications produced on the surface of materials by Fourier transformed infrared (FTIR) spectroscopy combined with chemometric treatments. Principal component analysis (PCA) allows the ordering of the surface modifications according to absorbed doses and the natural ageing. Results show the rising of the acid band and the variation of unsaturated compounds.
Mojtaba Safari - One of the best experts on this subject based on the ideXlab platform.
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Process modeling and evaluation of petroleum refinery wastewater treatment through response surface methodology and artificial neural network in a photocatalytic reactor using poly ethyleneimine (PEI)/titania (TiO_2) Multilayer Film on quartz tube
Applied Petrochemical Research, 2015Co-Authors: Parvaneh Pakravan, Aazam Akhbari, Hojatollah Moradi, Abbas Hemati Azandaryani, Amir Mohammad Mansouri, Mojtaba SafariAbstract:In this study, poly ethyleneimine (PEI)/Titania (TiO_2) Multilayer Film on quartz tubes have been successfully fabricated via a layer-by-layer (LbL) self-assembly method. Scanning electron microscopy (SEM) and Brunauer-Emmett-Teller (BET) surface area analysis were carried out for characterization of the layers on quartz tube. The SEM pictures showed that the Film surface is smooth and uniform. The BET characterization verified the formation of Multilayer thin Film. The photocatalytic activity of the PEI/TiO_2 Multilayer deposited on the quartz tubes was evaluated in the treatment of raw petroleum refinery wastewater (PRW) under UV light irradiation in three annular photocatalytic reactors. This study examined the impact of initial chemical oxygen demand (COD) concentration, H_2O_2 concentration, pH and reaction time on the PRW treatment and the results were used to generate both a response surface methodology (RSM) model and an artificial neural network (ANN) model. Maximum COD removal (98 %) was achieved at the optimum conditions (initial COD concentration of 300 mg/l, hydrogen peroxide concentration of 8.8 mM, pH of 5 and reaction time of 120 min). A comparison between the model results and experimental data gave a high correlation coefficient ( R _ANN ^2 = 0.9632, R _RSM ^2 = 0.943) and showed that two models were able to predict COD removal from PRW by PEI/TiO_2/UV process. However, ANN model was superior to RSM model with higher value of coefficient of determination (0.9632_ANN > 0.94_RSM) and the lower root mean square error (RMSE) (3.377_AAN
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Process modeling and evaluation of petroleum refinery wastewater treatment through response surface methodology and artificial neural network in a photocatalytic reactor using poly ethyleneimine (PEI)/titania (TiO_2) Multilayer Film on quartz tube
Applied Petrochemical Research, 2015Co-Authors: Parvaneh Pakravan, Aazam Akhbari, Hojatollah Moradi, Abbas Hemati Azandaryani, Amir Mohammad Mansouri, Mojtaba SafariAbstract:In this study, poly ethyleneimine (PEI)/Titania (TiO_2) Multilayer Film on quartz tubes have been successfully fabricated via a layer-by-layer (LbL) self-assembly method. Scanning electron microscopy (SEM) and Brunauer-Emmett-Teller (BET) surface area analysis were carried out for characterization of the layers on quartz tube. The SEM pictures showed that the Film surface is smooth and uniform. The BET characterization verified the formation of Multilayer thin Film. The photocatalytic activity of the PEI/TiO_2 Multilayer deposited on the quartz tubes was evaluated in the treatment of raw petroleum refinery wastewater (PRW) under UV light irradiation in three annular photocatalytic reactors. This study examined the impact of initial chemical oxygen demand (COD) concentration, H_2O_2 concentration, pH and reaction time on the PRW treatment and the results were used to generate both a response surface methodology (RSM) model and an artificial neural network (ANN) model. Maximum COD removal (98 %) was achieved at the optimum conditions (initial COD concentration of 300 mg/l, hydrogen peroxide concentration of 8.8 mM, pH of 5 and reaction time of 120 min). A comparison between the model results and experimental data gave a high correlation coefficient ( R _ANN ^2 = 0.9632, R _RSM ^2 = 0.943) and showed that two models were able to predict COD removal from PRW by PEI/TiO_2/UV process. However, ANN model was superior to RSM model with higher value of coefficient of determination (0.9632_ANN > 0.94_RSM) and the lower root mean square error (RMSE) (3.377_AAN
Nathalie Dupuy - One of the best experts on this subject based on the ideXlab platform.
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Effect of gamma irradiation on the oxygen barrier properties in ethyl-vinyl acetate/ethylene-vinyl alcohol/ ethyl-vinyl acetate Multilayer Film
Journal of Applied Polymer Science, 2020Co-Authors: Samuel Dorey, Nathalie Dupuy, Fanny Gaston, Sylvain R. A. Marque, Nina Girard-perier, Lucie DelaunayAbstract:The potential changes of single-use plastic materials (EVA/EVOH/EVA multi-layer Film in this study) used in biopharmaceutical and food-packaging industries are investigated after several gamma irradiation doses: 30, 50, 115, and 270 kGy, and for nonsterilized samples (0 kGy) from a point of view of mechanical properties, thermal properties and permeability properties. Tensile tests, differential scanning calorimetry (DSC), oxygen transmission rate (OTR) and water vapor transmission rate (WVTR) are performed on the Multilayer Film. For irradiation doses below 50 kGy, thermal and water vapor barrier properties are not altered. For higher doses (50 to 270 kGy), mechanical, thermal and water vapor barrier properties are slightly altered whereas oxygen barrier property decreases from 13 to 27 cm 3 .m −2 .day −1. This slight change is shown not to happen due to chain entanglement or chain mobility loss in the amorphous phase of the different polymers. It rather comes from a change of the chemical environment of the EVOH layer.
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Generation of O 2 -Permeation Barrier during the Gamma-Irradiation of Polyethylene/Ethylene-Vinyl Alcohol/Polyethylene Multilayer Film
Industrial and engineering chemistry research, 2019Co-Authors: Samuel Dorey, Nathalie Dupuy, Fanny Gaston, Sylvain R. A. Marque, Nina Girard-perier, Lucie DelaunayAbstract:Polymers such as polyethylene (PE) and ethylene vinyl alcohol (EVOH) are primary constituents of Multilayer Films used in the food and biopharmaceutical packaging. In order to explore the Film behavior after gamma-sterilization, several tests are performed (tensile tests, differential scanning calorimetry (DSC), oxygen transmission rate (OTR) and water vapor transmission rate (WVTR). The investigation of the PE/EVOH/PE Multilayer Film is done at several gamma-irradiation doses up to 270 kGy. For irradiation dose up to 50 kGy, mechanical properties are not altered. Whatever the irradiation dose, water barrier in PE/ EVOH/PE Multilayer Film is not altered whereas the oxygen barrier property is increased by 300%. This enhancement is shown not to occur due to reorientation, closer chain packaging and restriction of chain mobility of polymer chains in the amorphous phase of the different polymers. This enhancement rather comes from a change of the chemical environment of the EVOH layer.
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One year monitoring by FTIR of γ-irradiated Multilayer Film PE/EVOH/PE
Radiation Physics and Chemistry, 2016Co-Authors: Fanny Gaston, Magali Barbaroux, Nathalie Dupuy, Sylvain R. A. Marque, Samuel DoreyAbstract:The Multilayer Films made of polyethylene/polyethylene-co-vinyl alcohol/polyethylene are γ-irradiated for biopharmaceutical and biotechnological applications. The radiations generate changes in the polymer Films. In this study, we focused on the modifications produced on the surface of materials by Fourier transformed infrared (FTIR) spectroscopy combined with chemometric treatments. Principal component analysis (PCA) allows the ordering of the surface modifications according to absorbed doses and the natural ageing. Results show the rising of the acid band and the variation of unsaturated compounds.