Plasticized PVC films/petroleum oils: The effect of ultraviolet irradiation on plasticizer migration

Abstract

SYNOPSISPlasticizer migration from flexible poly (vinyl chloride ) comprises an important aspect, especially when packaging foodstuffs and pharmaceuticals. Much of the published work has been intended either to correlate migration into simulants with that into foods or to study migration into simpler extractants, enabling the various parameters involved in migration to be studied in isolation. According to the latter approach, the migration of dioctyl phthalate into petroleum oils has been studied already in our laboratory and in this paper results are presented in an attempt to reduce or prevent migration by U.V. irradiation. The effect of irradiation time on short-and long-term migration behavior was examined together with the influence of the immersion temperature. The nature of the liquid environment seemed to be a predominant aspect: high viscosity oils presented a satisfactory behavior in contrast with those of lower viscosity in which the prevention effect was rather negligible. On the other hand, primary kinetics studies yielded similar results with those already established for untreated material (i.e., good conformity to the short time Fickian approximation).

Diffusion of Model Contaminants in High‐Density Polyethylene

“…[10][11][12][13][14][15] The knowledge of the transport parameters of the surrogate-polymer system, and especially of the diffusion coefficient, D, therefore becomes of critical importance. Since, in practice, diffusion experiments are difficult to perform and time consuming, it would be very useful to be able to predict diffusivity through modeling for such surrogate-polymer systems.…”

Effect of thermal annealing on plasticizer migration in poly(vinyl chloride)/dioctyl phthalate system

“…This phenomenon was quite common in previous studies on plasticizer migration into liquid environments. [5][6][7]16,17 Furthermore, it was proposed that counterdiffusion can be separated into two distinct processes comprising liquid transfer into and out of the PVC sheets. Thus, the maximum of the counterdiffusion curve is considered to be the equilibrium value for the sorption (or penetration) process, as well as the initial value of the desorption process.…”

“…Thus, the maximum of the counterdiffusion curve is considered to be the equilibrium value for the sorption (or penetration) process, as well as the initial value of the desorption process. 16,17 In the sorption data, the Fickian approximation for short times seems to be appropriate because the liquid penetration process occurs within a period of a few days. On the contrary, the desorption stage is certainly a long-term process that requires the long-term approximation of Fick's law for a satisfactory fitting.…”

“…On the contrary, the desorption stage is certainly a long-term process that requires the long-term approximation of Fick's law for a satisfactory fitting. 17,19 In Figure 4 typical sorption and desorption curves are plotted for isopropanol. Tables II and III present diffusion coefficients for the sorption and desorption stages versus the sheet thickness and initial plasticizer concentration.…”

Diamide derivatives as photostabilizers for plasticized poly(vinyl chloride)

“…The effect of plasticizers such as dioctyl phthalate (DOP) on the mechanical properties was investigated [17]. Plasticizer migration from flexible PVC comprises an important aspect, especially when this type of PVC is used in packaging foodstuff and pharmaceuticals [18]. The workers studied the effect of UV irradiation on the migration of DOP from the polymer matrix, and they found that this migration was reduced or even prevented by the influence of UV irradiation.…”