Abstract
Of the various oxidizing agents available. never have the tetrabutyl ammonium permanganate or the potassium psrmanganate been used for the oxidation of polyolefins in the molten state. The effects of time and temperature on the oxidation reaction were studied using an internal mixer. The reaction was performed in the presence of traces of hexadecyl alcohol as an accelerator. In certain cases, biphenyl was uscd as a conipatibilizing agent in the molten state. The oxidized polyethylene was purified by sol-ubilization in order to eliminate the MnOl formed from the reaction between KMnO4, tetrabutyl ammonium permanganate, and low-density polyethylene (LDPE). The presence of MnO2 was confirmed by chemical tests and by electron spectroscopy for chemical analysis (ESCA). Infrared and ESCA analyses were conducted in order to determine the presence of carboxylate ester. and ketonic or alcoholic groups as well as the amount of carbonyl groups. The mechanical and physical properties were determined. A diluted H2SO4 solution was used to hydrolyze the ester groups. The results are compared with virgin LDPE as well as with a commercial oxidized polyethylene. A reaction mechanism of oxidation of the LDPE in the molten state is proposed.
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