Influence of nanodispersed boehmite on polypropylene photooxidation - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Polymer Degradation and Stability Année : 2007

Influence of nanodispersed boehmite on polypropylene photooxidation

Résumé

Nanocomposites containing pure or organically modified nanoboehmites of different sizes were prepared by melt compounding with polypropylene. The samples were UV light irradiated in artificial accelerated conditions representative of solar irradiation (λ > 300 nm) at 60 °C in air. The chemical modifications resulting from photooxidation were followed by IR and UV–visible spectroscopies. The presence of pristine nanoboehmites was shown to change the rate of oxidation of polypropylene by reducing the oxidation induction period due to the presence of residual processing antioxidant. The differences of the oxidation induction periods between the nanocomposites and the pristine polymer disappear after solvent extraction of the antioxidant. The inefficiency of traditional antioxidant in retarding the photooxidation of polypropylene containing nanodispersed boehmite is proved. Antioxidant migration to the boehmite surface induced by the preferential interaction with the polar filler is proposed as an explanation. The oxidative behaviour of the organically modified boehmites was shown to depend on the type of organic substituent. p-Toluenesulfonate reduces the adsorption of antioxidants while the presence of a long-chain alkyl benzensulfonate increased the oxidation rate by generation of radical initiators
Fichier non déposé

Dates et versions

hal-00273856 , version 1 (16-04-2008)

Identifiants

  • HAL Id : hal-00273856 , version 1

Citer

Sergio Bocchini, Sandrine Morlat-Therias, Jean-Luc Gardette, Giovanni Camino. Influence of nanodispersed boehmite on polypropylene photooxidation. Polymer Degradation and Stability, 2007, 92, pp.1847-1856. ⟨hal-00273856⟩

Collections

PRES_CLERMONT CNRS
94 Consultations
0 Téléchargements

Partager

Gmail Mastodon Facebook X LinkedIn More