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- W2168741372 abstract "Unstabilized and phenolic antioxidant stabilized PP films were aged in draft air ovens at temperatures between 150 and 40°C. The Arrhenius plots of the failure times reveal quite distinctive features. Thus, unstabilized PP films show a marked downward curvature of the plot at temperatures below 80°C. The role of Ti catalyst residues in this behavior is discussed.Phenolic antioxidant stabilized films show a similar bent in the Arrhenius plot at significantly higher temperatures. Furthermore, these plots can be superposed onto the curve obtained for the unstabilized film by a shift parallel to the reciprocal absolute temperature axis. The numerical value of the shift is a function of the chemical nature of the phenolic antioxidant and of its concentration. Remarkably, the phenol stabilized films show a second curvature in the Arrhenius plot at temperatures below 80°C. This second curvature is an upward bent so that the Arrhenius plot becomes a typical sigmoid. This low temperature curvature depends also on the nature of the phenolic antioxidant and its concentration. It is attributed to some kind of complexation of the Ti catalyst residues by the phenols. Comparison with PP films stabilized with Hindered Amine Stabilizers (HAS) and with PE-LD films lends additional support to the conclusions concerning the role of transition metals." @default.
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- W2168741372 date "1999-01-01" @default.
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- W2168741372 title "Effect of temperature on the lifetime of stabilized and unstabilized PP films" @default.
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- W2168741372 doi "https://doi.org/10.1016/s0141-3910(98)00059-7" @default.
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