Photostabilization study of ethylene-butyl acrylate copolymers functionalized in the molten state with hindered amine light stabilizers (HALS) |
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Authors: | L. Ló pez-Vilanova,E. Espí ,I. Martinez,J.L.G. Fierro,T. Corrales,F. Catalina |
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Affiliation: | 1. Departamento de Química Macromolecular Aplicada, Grupo de Fotoquímica, Instituto de Ciencia y Tecnología de Polímeros (CSIC), C/Juan de la Cierva, 3, 28006 Madrid, Spain;2. Centro de Investigación y Desarrollo, Repsol, Dirección de Tecnología Química, Autovía A-5, Km.18, 28931 Móstoles, Madrid, Spain;3. Instituto de Catálisis y Petroleoquímica-CSIC, Marie Curie 2, Cantoblanco, 28049 Madrid, Spain |
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Abstract: | Hindered Amine Light Stabilizers (HALS), N-methylated and O-alkylhydroxylamine, were successfully anchored onto an ethylene-co-butyl acrylate (BA) by a transesterification reaction in the molten state. The content of HALS bonded to the EBA was calculated from the atomic ratio (N/C) determined by X-ray Photoelectron Spectroscopy (XPS). After reaction times of 5–30 min in the molten state the content of bonded HALS attained values from 0.17 to 0.63%. The modified EBA with HALS were studied by Chemiluminescence emission and the photostabilization effect was evaluated under accelerated ageing in the presence of pesticides. The antioxidant effect of HALS bonded to EBA was evaluated by determination of Carbonyl Index (CI) and retention of elongation at break as a function of exposure time and pesticide treatment. The stability of the EBA with anchored HALS exhibited higher performance as shown by low CI-values and correlated with the content of bound HALS and the thermal history of the materials. Also, mechanical properties correlated well with the CI results and the photostabilization of bound HALS was effective until 3150 h of exposure time using pesticides. |
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Keywords: | Photostabilisers HALS Functionalization in the molten state Agricultural films Ethylene-butyl acrylate copolymers |
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