EFFECT OF CaCO3 FILLER ON THE DEGRADATION OF HIGH DENSITY POLYETHYLENE (HDPE) FILM CONTAINING PROOXIDANTS
Keywords:calcium carbonate, filler, polyethylene degradation, accelerated weathering
The aim of this work is investigation of effect of CaCO3 filler on the degradation of high density polyethylene (HDPE) films containing stearate salts as prooxidant additves. The films with thickness of 30 µm were prepared by adding 0.3 % (w/w) prooxidant additives mixture (manganese (II) stearate/feric stearate/cobalt (II) stearate ratio of 18:4:1) and CaCO3 filler from 5 to 20 % (w/w) in HDPE resins using twin screw extruder. The films were carried out accelerated weathering treatment according to ASTM G154 standard (340 nm UV lamp, 8 hours UV, 4 hours condensation at 50 0C) for maximum duration of 96 hours. The mechanical properties, FTIR analysis, Differential Scanning Calorimetry (DSC), Thermo gravimetric analysis (TGA) and Scanning Electron Microscope (SEM) were used to assess the changes in the structure and surface morphology of films during accelerated weathering. The results showed that the degradation rate of HDPE films decreased by adding CaCO3 filler and versused with CaCO3 filler content. FTIR traces revealed that CaCO3 filler didn’t affect to the mechanism of polyethylene degradation. After 96 hours of aceelerated weathering treatment, the elongation at break of the HDPE film with 5 % CaCO3 almost unchanged while this value of the HDPE films with 10 and 20 % CaCO3 decreased significantly (96 % and 100 %, respectively).
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