Journal
POLYMER DEGRADATION AND STABILITY
Volume 91, Issue 3, Pages 472-478Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2005.08.007
Keywords
stabilizers; solubility; mobility; service life
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The efficiency of antioxidants in polymers is determined by three processes: the chemical reactivity, the physical loss and a minimal effective concentration. In most cases, loss of the stabiliser by physical processes (evaporation, leaching) is more significant than the loss by chemical consumption. In this paper, a model is proposed that relates the protection time of an antioxidant to the migration in a polymer matrix. The parameters that determine the migration, i.e. mobility (D) and solubility (S) are predicted using theoretical modelling. A linear correlation was found between the protection time and the function -S In(D). In some cases this correlation is better than that of the empirical model proposed by Moisan, In (S-2/D). (c) 2005 Elsevier Ltd. All rights reserved.
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