engleski

Development of double layered PE/PCL films for food packaging modified with zeolite and magnetite nanoparticles

Low density polyethylene is a classic material used for food packaging due to numerous advantages it has, but low oxygen barrier property is its main weakness. To improve permeability properties double layer polyethylene/polycaprolactone (PE/PCL) films were prepared with the addition of zeolite or/and magnetite in PCL layer. Zeolite and magnetite nanoparticles were added as the modifiers in PCL film since they slow down the process of oxygen permeability. For the multi- component materials of great importance is matrix-filler interaction that result in better dispersion of particles in the matrix and greater adhesion. The consequence is improved performance for the new formulation strategies to develop composites have potential applications in various types of packaging (dried food, frozen food, etc.). In particularly important for the double layer films is good adhesion between two layered films that can easily separate under the mechanical stress. Food packaging, except good barrier is needed to have good thermal and mechanical properties because they have to be flexible and endure the higher temperatures, like sterilization, etc. For the studied samples oxygen permeability parameters were analyzed but also thermal and mechanical properties were determined. It is found that thermal stability and mechanical properties of double layer films compared to PE film alone were improved, especially for the samples when zeolite is modified with magnetite. Oxygen barrier performance in modified PE/PCL samples was improvement, seen in sample with higher content of magnetite in zeolite.

polyethylene (PE) ; polycaprolactone (PCL) ; doubles layered films ; food packaging ; zeolite ; and magnetite.

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