Influence of solvent absorption on the migration of Irganox 1076 from LDPE

Abstract

The effect of solvent absorption on additive migration was studied by relating the diffusion coefficient (D) of Irganox 1076 to the maximum solvent absorption of different solvents in low-density polyethylene (LDPE) film. Solvents tested were ethanol, isopropanol, isooctane, ethylacetate, cyclohexane, tributyrin, tricaprylin and olive oil. Diffusion and partition coefficients were determined by fitting the migration curves, i.e. the concentration of Irganox 1076 in solvent as a function of time, with Fick 's diffusion equation. The results for the low molecular weight solvents show that with increasing maximum solvent absorption, D of Irganox 1076 is increasing as well. This trend is not observedfor the two triglycerides and olive oil. In spite of absorption, no increase in D was observed. The obtained result is the basis of an extended predictive migration model that, besides migrant and polymer properties, is also based on the maximum solvent absorption in the polymer.

Release of synthetic phenolic antioxidants from extruded poly lactic acid (PLA) film

“…Mascheroni, Guillard, Nalin, Mora, and Piergiovanni (2010) speculated that ethanol would play as a plasticizer for the PLA matrix and would open the structure creating void spaces favoring the polyphenols release. Absorption of certain organic solvents causes swelling of the polymer matrix, thereby enlarging the gaps and increasing additive release rates (Helmroth, Rijk, et al, 2002a, Helmroth, Dekker, et al, 2002b.…”

“…Therefore, the release rate extensively depends on the size and shape of the migrants and on the size and number of the gaps. The latter will depend on polymer properties such as density, crystallinity and degree of crosslinking and branching (Helmroth, Rijk, Dekker, & Jongen, 2002a, Helmroth, Dekker, & Hankemeier, 2002b. According to Limm and Hollifield (1996) several factors influence antioxidants diffusion through polymer including: (1) related-polymer factors such as polymer morphology, crystallinity, molecular weight distribution, density, and orientation which eventually determine sizes and shapes of microcavities and their distribution, (2) related-antioxidants factors such as their molecular size, shape, density, polarity, and solubility, (3) factors related to the interaction of a polymer and antioxidant such a plasticizing or antiplasticizing effect, and (4) factors related to temperature such as T g and T m of polymer.…”

Experimental and theoretical study of thermodynamics and transport properties of multilayer polymeric food packaging

“…I-1076 initial concentrations in the mono-and multilayer films are shown in Table 2. In previous works, which analyze the I-1076 migration in polyolefins, the authors used concentration values in the same order of magnitude [18].…”

“…The mass transfer process from a package to food simulants or foodstuffs could be a complex process, and very often, the analytical mathematical solution of a transport model is not available, so its numerical solution will be required [18,19]. To assess migration of additives and contaminants from food packaging into films, mathematical modeling based on Fick's second Law [30] was used.…”

“…Because of this, the use of mathematical models to predict migration has increased in recent years [17][18][19]. The recent regulation related to plastic materials and articles intended to come into contact with foodstuffs accepts the use of migration modeling if the applied diffusion models are known and supported by scientific studies.…”