Effect of nanoclay on the transfer properties of immanent additives in food packages

Nanoscience and nanotechnologies for biobased materials, packaging and food applications: New opportunities and concerns

“…In principle, the addition of an impermeable filler in a polymer matrix is expected to affect the solubility and diffusivity of a penetrant molecule (i) by introducing a path tortuosity when penetrants are forced to migrate around impermeable fillers and (ii) by modifying the interaction properties of the PNC due to the sorption/adsorption capacity of the nanoclays and their possible affinity for the diffusing molecules. Efforts have recently been led to enhance the knowledge of migration mechanisms by investigating the impact of ENM on the diffusion coefficient and partition coefficient of a panel of 8 lowmolecular-weight molecules representative of plastic additives in food-packaging systems including PNC (linear low-density polyethylene including 5% of MMT) and different food-simulating liquids (Nasiri, Peyron et al 2016). Results showed that apparent diffusivity (Dap) was significantly reduced by the incorporation of MMT in the LLDPE-based packaging in the case of contact with aqueous simulants but not when when PNC is set in (Bharadwaj 2001) compared to the values predicted from tortuosity-based models assuming a regular arrangement of parallel nanoplatelets (Nielsen 1967;Cussler, Hughes et al 1988;Moggridge, Lape et al 2003;Lape, Nuxoll et al 2004) Apparent diffusivities measured on pure LDPE and LDPE-based nanocomposites including 5% of MMT in contact with 10% ethanol compared to the predicted values determined using analytical tortuositybased models.…”

“…The affinity of the diffusing molecules for nanoparticles is clearly dependant of their binding capacity and, consequently, their polarity (Nasiri, Peyron et al 2016). based on "worst-case" scenario using an overestimation of the diffusion coefficient remain applicable to the risk assessment of such nanocomposite packaging.…”

Investigating the diffusional behaviour of Irganox®1076 antioxidant in HDPE/Cloisite®15A nanocomposite‐based food contact packaging films: Effect of nanoclay loading

“…Nanofillers have been proved to enhance the barrier properties of polymers, and to impart other additional benefits such as improvements in mechanical properties and weight reduction of the resulting nanocomposite packaging items . In this view, and in order to understand the diffusion phenomena and to develop new barrier materials, various research works were conducted to study the effectiveness of nanoclay incorporation into polymeric substrates to form barrier packaging materials . Most of the reported literature studies of such emerging materials only focused on the transport of gas molecules, mainly oxygen (O 2 ), carbon dioxide (CO 2 ), and water vapor .…”

“…However, and to the best knowledge of the authors, diffusion/migration studies of polymer additives, such as antioxidants, slip agents, antistatic agents, and so on, in polymeric nanocomposites packagings are very scarce and not well documented. The few existing works mainly favoured migration studies of the additives in food simulants over diffusion ones because the latter require very hard and time consuming experimental work and many costly analyses of specimens …”

“…6 In this view, and in order to understand the diffusion phenomena and to develop new barrier materials, various research works were conducted to study the effectiveness of nanoclay incorporation into polymeric substrates to form barrier packaging materials. [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] Most of the reported literature studies of such emerging materials only focused on the transport of gas molecules, mainly oxygen (O 2 ), carbon dioxide (CO 2 ), and water vapor. [7][8][9][10][11][12][13][14][15] However, and to the best knowledge of the authors, diffusion/migration studies of polymer additives, such as antioxidants, slip agents, antistatic agents, and so on, in polymeric nanocomposites packagings are very scarce and not well documented.…”