Influence of nanodispersed boehmite on polypropylene photooxidation

被引:67
作者
Bocchini, Sergio
Morlat-Therias, Sandrine
Gardette, Jean-Luc [1 ]
Camino, Giovanni
机构
[1] Univ Blaise Pascal, CNRS, Lab Photochim Mol & Macromol, UMR 6505, F-63170 Clermont Ferrand, France
[2] Politecn Torino, Ctr Cultura Ingn Mat Plast, INSTM Res Unit, I-15100 Alessandria, Italy
关键词
boehmite; photooxidation; polypropylene; nanocomposites;
D O I
10.1016/j.polymdegradstab.2007.07.002
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
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 (lambda > 300 nm) at 60 degrees 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. (C) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1847 / 1856
页数:10
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