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Antioxidation activity of several diphosphonates in thermooxidative stability of LDPE

S. JIPA1,2,* , L. M. GORGHIU1, C. DUMITRESCU1, M. BUMBAC1, R. L. OLTEANUa1, T. ZAHARESCU2, H. CUTHON- GOURVES3

Affiliation

  1. Valahia University Targoviste, Chemistry Department 18-20 Unirii Bd., 130082 Targoviste, Romania
  2. INCDIE, ICPE CA, 313 Splaiul Unirii, Bucharest, Romania
  3. Bretagne Occidentale University, 6, av. Victor le Gorgeu – CS 93837, 29238 Brest Cedex 3, France

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 oC, 190 oC and 200 oC. 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..

Keywords

Diphosphonates, Chemiluminescence, Oxidation, antioxidants, Thermal degradation.

Submitted at: Jan. 18, 2006
Accepted at: March 23, 2006

Citation

S. JIPA, L. M. GORGHIU, C. DUMITRESCU, M. BUMBAC, R. L. OLTEANUa, T. ZAHARESCU, H. CUTHON- GOURVES, Antioxidation activity of several diphosphonates in thermooxidative stability of LDPE, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 2, pp. 654-658 (2004)