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Migration of Irgafos 168 and its Degradation Products from Nanocopper/Polypropylene Composite Films and its Prediction by AKTS-SML Software



Three polypropylene composite films, polypropylene random copolymer (PP-R) composite film, polypropylene blockcopolymer (PP-B) composite film, polypropylene homopolymer (PP-H) composite film, were prepared by extruding three types of PP matrix with Irgafos 168 and nanocopper. Three films were treated by UV irradiation and sunlight exposure to different time to evaluate the degradation behaviors of 168 and the generation of its two degradation products, 2,4-di-tert-butylphenol (DP1) and tris(2,4-di-tert-butylphenyl)phosphate (DP2). For migration study, the films were treated by 30 min UV irradiation and 100 days sunlight exposure respectively and then tested in food simulant (isooctane) at 20, 40 and 70℃ to explore the migration behaviors of Irgafos 168, DP1 and DP2 using GC-MS. AKTS-SML software which was used to predict the migration of organic additives from plastic films was also adopted to simulate the migration of Irgafos 168 and its degradation products from PP composite films and the comparison of experimental value and analog value were discussed. After UV irradiation and long time sunlight exposure, faster degradation of Irgafos 168 and generation of DP2 in PP-R composite films were found. For migration study, the migration of Irgafos 168, DP1 and DP2 in three different PP structural films were still in the order of PP-R > PP-B > PP-H which means the addition of nanocopper has no effect on the migration order in three different PP structural films. The simulated migration of Irgafos 168 was higher than the experimental results; the results of DP1 experiment after UV treatment were significantly higher than that of the simulation results, however the DP1 experimental results were similar to the simulation results of the sunlight migration test; the DP2 experimental results of each test were similar to the simulation results.


Irgafos 168, degradation, migration, nanocopper, AKTS-SML softwareText


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