This paper presents the interaction between carbon black and antioxidants in high-density polyethylene. The 11 formulations prepared for this study were composed of furnace black with particle sizes of 27 and 75 nm at 2% to 5% by weight and different concentrations of antioxidants Irganox 1010 and Irgafos 168. The chemical interactions between the carbon black and the antioxidants were accelerated by elevated temperatures of 85°C in a forced-air oven. The relative amount of antioxidants retained in the samples throughout the incubation was measured using the oxidative induction time (OIT) test. The results showed that the initial OIT value increased with the weight percentage of the carbon black in the sample. A higher initial OIT value was found in the samples that had been blended with the 27-nm carbon black than in those blended with the 75-nm carbon black at the same concentration. Also, faster OIT depletion was detected in the samples that had been blended with the 27-nm carbon black than in those blended with the 75-nm carbon black at greater than 2% by weight. The carbon black–antioxidant interaction was found to be influenced by the carbon black–specific surface area and physical structure. Overall, the OIT decreased substantially faster in the samples with carbon black than in those without it. The reactions between the carbon black and the antioxidants were so strong that only a minor difference in the depletion rate was observed between the two antioxidant formulations.
Interaction between Carbon Black and Antioxidants in High-Density Polyethylene Pipe Resin
Transportation Research Record: Journal of the Transportation Research Board
Transportation Research Record: Journal of the Transportation Research Board ; 2310 , 1 ; 137-144
01.01.2012
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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