The mixed impact of nanoclays on the apparent diffusion coefficient of additives in biodegradable polymers in contact with food

Lajarrige, Anaïs; Gontard, Nathalie; Gaucel, Sébastien; Samson, Marie-Françoise; Peyron, Stéphane

doi:10.1016/j.clay.2019.105170

Cited by 11 publications

(8 citation statements)

References 47 publications

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“…For low-barrier polymers in rubbery states, such as PBSA and PHBV, the measurements carried out after 10 days of contact were performed in an equilibrium state of concentration in both compartments (packaging and food simulant) for each additive. This observation partly justifies the low influence of the presence of nanoclays, whose impact on the diffusion properties of these polymers has already been demonstrated [11].…”

Section: Relative Migration Measurementsupporting

confidence: 68%

“…The differing scales of the histograms highlight the impacts of the polymer type and the food simulant, these observations having already been established and commented on a previous study performed on untreated material [11]. The accelerated aging does not impact this range of scales; the apparent diffusion coefficient ranking is as follows: PBSA/95% ethanol > PBSA/isooctane > PHBV/95% ethanol > PHBV/isooctane.…”

Section: Dapp Values Of Additives In Neat and Nanocomposite Aged Materialssupporting

confidence: 56%

“…These results suggest that the degree of crystallinity is not sufficient to explain the transfer properties of a material, since the measure of the crystallinity degree measured on all of the samples does not evidence any impact of the incorporation of nanoclays. It is therefore likely that the combined effects of nanoclay and UV treatment induce structural reorganizations of polymer chains The differing scales of the histograms highlight the impacts of the polymer type and the food simulant, these observations having already been established and commented on a previous study performed on untreated material [11]. The accelerated aging does not impact this range of scales; the apparent diffusion coefficient ranking is as follows: PBSA/95% ethanol > PBSA/isooctane > PHBV/95% ethanol > PHBV/isooctane.…”

Section: App Values Of Additives In Neat and Nanocomposite Aged Materialsmentioning

confidence: 79%

“…PBSA and PHBV films containing 5 wt% C-30B (PBSA NCP and PHBV NCP) were synthetized by a melt extrusion process using an EuroLab 16XL co-rotating twin-screw extruder (Thermo Scientific TM , Karlsruhe Germany) with a L/D ratio of 40 and a screw diameter of 16 mm as described previously [11]. The control samples of neat polymers were prepared following the same protocol used for nanocomposites in order to respect the same thermal processes.…”

Section: Preparation Of Materialsmentioning

confidence: 99%

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Evaluation of the Food Contact Suitability of Aged Bio-Nanocomposite Materials Dedicated to Food Packaging Applications

et al. 2020

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Nanocomposite materials based on bio-polyesters (PBSA and PHBV) have been evaluated for their suitability for food contact according to the recommendations defined for non-biodegradable plastic materials, and subsequently, according to accelerated aging treatment. On the basis of the limited number of material/migrant/food simulant combinations studied here, the test for migration, using food simulants, appeared directly applicable to testing such materials which are not considered humidity-sensitive materials. Considering the only compliance criterion that must be met by the materials in contact, the materials submitted to the aging processing are not of safety concern and the incorporation of nanoclays in aged biodegradable materials does not interfere with their inertial properties in a dramatic way. At the molecular scale, the UV irradiation proved to induce an increase in the degree of crystallinity, resulting in a modification of transport properties of both packaging materials. The values of overall migration and specific migration were reduced without decreasing the diffusion coefficients of the target additives. The UV treatment and the addition of nanoparticles, therefore, seem to jointly promote the retention of organic compounds in the materials by increasing their affinity for packaging material.

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Section: Relative Migration Measurementsupporting

confidence: 68%

Section: Dapp Values Of Additives In Neat and Nanocomposite Aged Materialssupporting

confidence: 56%

Section: App Values Of Additives In Neat and Nanocomposite Aged Materialsmentioning

confidence: 79%

Section: Preparation Of Materialsmentioning

confidence: 99%

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Evaluation of the Food Contact Suitability of Aged Bio-Nanocomposite Materials Dedicated to Food Packaging Applications

et al. 2020

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“…The dispersion state of the clay platelets among the polymer matrix directly impacts the macroscopic performances of the nanocomposites [14], including the transfer properties [15]. The XRD diffractogram of the pure PE matrix did not reveal any diffraction peak, as expected and revealed in Figure 2.…”

Section: Microstructure Of the Polymer Nanocompositesupporting

confidence: 64%

Food-Grade PE Recycling: Effect of Nanoclays on the Decontamination Efficacy

et al. 2020

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Although PE-based nanocomposites are gaining interest within the food packaging industry for their outstanding functional properties, their end-of-life has been poorly studied. The lack of identification of such materials suggests that they could end-up in the recycling pathway optimized for the decontamination of un-filled PE. The objective of the present work is to understand and quantify the mechanisms involved in the high temperature desorption of surrogates for PE nanocomposites filled with organo-modified montmorillonite (PNC), compared to conventional PE. An original experimental setup was coupled with a modelling approach to identify the two phenomena involved in the decontamination process: diffusion of the surrogate into the bulk and its evaporation at the surface. A sweep of experimental temperatures enabled the determination of diffusion and evaporation parameters for PE and PNC and the activation energies related to the diffusivity among those two materials. The effects of the introduction of clay nanofillers onto the decontamination process have been explained and recommendations for the recycling pathway have been put forward.

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