Abstract
Films produced with blends of linear low density polyethylene and low density polyethylene (LLDPE + LDPE) containing 5 wt % of potassium sorbate (KS) were prepared by flat film extrusion. These films were characterized by differential scanning calorimetry and wavelength dispersive X-ray fluorescence. The migration profile of KS was followed by Attenuated Total Reflection-Fourier Transform Infrared and Ultraviolet spectroscopies and its effect on the sealing curve was determined. The addition of 5% of KS showed no effect in the thermal properties of polyethylene. However, the sealing properties were slightly affected by KS migration, acting as an impurity in the sealed area, which needed a higher sealing force at lower temperatures.
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