LDPE protected by secondary amines of dehydroabietic methyl ester derivatives

• Published in: Polymer testing Vol. 23; no. 8; pp. 911 - 917
• Main Authors: Jipa, S., Zaharescu, T., Gorghiu, L.M., Dumitrescu, C., Gigante, B., Esteves, M.A., Brites, M.J.S.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.12.2004; Elsevier
• Subjects: Applied sciences; Chemiluminescence; Dehydroabietic derivatives; Exact sciences and technology; Low density polyethylene; Physicochemistry of polymers; Polymer industry, paints, wood; Stabilisation; Technology of polymers; Dehydroabietic derivatives; Chemiluminescence; Stabilisation; Low density polyethylene; Polymer
• ISSN: 0142-9418; 1873-2348
• DOI: 10.1016/j.polymertesting.2004.05.003

The thermal degradation of low density polyethylene in the presence of several esters—methyl-12 N-(phenyl)amino-14-amino-dehydroabietate (A 8), methyl-12 N-(2-methoxyphenyl)amino-14-amino-dehydroabietate (A 9), methyl-12 N-(4-methoxyphenyl)amino-14-amino-dehydroabietate (A 11) and methyl-12 N-(phenyl)amino-14-nitro-dehydroabietate (A 12)—was investigated by chemiluminescence at three temperatures: 180, 200, and 220 °C. Kinetic parameters that depict the stability of polymers—temporal characteristics (oxidation induction times, 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 compounds tested and other antioxidants, namely 4010 (amine compound) and Irganox 1010 and 1076 (hindered phenols), is presented for comparison. Experimental data have demonstrated that two members of the studied series, A 8 and A 11, are more efficient than good commercial hindered phenols.