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Showing papers by "Laura Monica Gorghiu published in 2006"


Journal ArticleDOI
TL;DR: In this article, a kinetic study on thermal degradation of stabilised low density polyethylene by chemiluminescence investigations was performed, where four hindered amine light stabilisers, additive compounds, were used as thermal protector on polymer substrate.
Abstract: The kinetic study on thermal degradation of stabilised low density polyethylene by chemiluminescence investigations was performed. Four hindered amine light stabilisers, additive compounds, were used as thermal protector on polymer substrate. The experiments were carried out on the samples consisting of polyetylene and 0.25% (w/w) of hindered amine. Three temperatures (180, 190 and 200 °C) were selected for this assay allowing the calculation of the activation energy required for thermal oxidation of polyethylene matrix. A discussion on mechanistic aspects concerning the antioxidant efficiency of studied compounds is also presented.

10 citations


Journal Article
TL;DR: In this article, the thermal degradation of low density polyethylene in the presence of several esters - diphosphonates compounds mostly used in anticancer treatment - was investigated by chemiluminescence at three temperatures: 180 °C, 190 °C and 200 °C.
Abstract: The thermal degradation of low density polyethylene in the presence of several esters - diphosphonates compounds mostly used in anticancer treatment - was investigated by chemiluminescence at three temperatures: 180 °C, 190 °C and 200 °C. Kinetic parameters that depict the stability of polymer - temporal characteristics (oxidation induction time, half - period of oxidation and maximum oxidation time), oxidation rates and activation energies - were calculated from the dependencies of chemiluminescence intensity on thermal degradation time. The stabilization effectiveness of the tested compounds and other antioxidants, namely SANDOSTAB P-EPQ and TOPANOL OC is presented for comparison. Experimental data have demonstrated that one of the diphosphonates compounds is more efficient than the commercial antioxidants.

1 citations