Razgradivost polietilenskih folija u veštačkim i prirodnim uslovima / Polyethylene foil degradability in artificial and natural conditions
2012
Lazić, Vera L. (Tehnološki fakultet, Novi Sad (Srbija)) | Šuput, Danijela Z. (Tehnološki fakultet, Novi Sad (Srbija)) | Hromiš, Nevena M. (Tehnološki fakultet, Novi Sad (Srbija)) | Popović, Senka Z. (Tehnološki fakultet, Novi Sad (Srbija))
Different products of milk processing industry are packed in numerous various packaging materials formed into an attractive package that meets consumer needs. Besides primary packaging, the use of secondary packaging materials in the form of transport boxes, washers, and shrinking foils is also significant. All packaging materials with their environmental attributes affect the environment. Reducing the impact of used and discarded packaging on the environment may be possible by using biodegradable packaging materials. New generation of packaging materials are biopolymers, edible packaging and biodegradable packaging materials for different products packaging. Synthetic polymers become biodegradable with the addition of additives for degradation. Added additive makes plastic biodegradable because it changes some chemical and physical properties of plastics. The aim of this paper is to examine the degradation of polyethylene foils, to which an additive was added, and which are used in the food industry. Polyethylene foil, to which an additive was added, was selected as a sample. The degradability of this sample was examined in natural and artificial conditions. Before and after exposure to natural and artificial conditions, tensile properties, melt mass flow and structural properties of the polymer film were tested. The results showed decrease in tensile properties below 5% of the initial value, increase in carbonyl index and increase in MFR after samples were treated in both ways. So it could be concluded that the examined foil is degradable. Achieving degradation in natural condition lasted 4 weeks (28 days) and in artificial laboratory conditions 120 hours (5 days).
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