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Lookup NU author(s): Emeritus Professor Jim White
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The photodegradation of bars made from two nominally similar polypropylenes has been monitored during prolonged UV exposure by deriving the scission and crosslink concentrations at different depths using computer-aided analysis of GPC molecular mass distributions. The degradation in one of the polypropylenes (MPP) was much faster than in the other (PP). A steep degradation profile was observed near to the exposed surface; it remained in a fixed position with PP but moved progressively away from the surface in MPP. This correlated with the tensile failure behaviour observed with the samples. The scission/crosslink ratio fell steeply from 6 to 8 near the surface to ∼3 in the interior. The steepest part of the transition was at about 0.3 mm with PP for all exposures whereas with MPP it moved progressively away from the exposed surface (∼0.3 mm after 16 weeks exposure; ∼0.7 mm after 49 weeks). Stabilized PP and MPP showed quite different degradation profiles to the unstabilized polymers. © 2004 Elsevier Ltd. All rights reserved.
Author(s): Shyichuk AV, Turton TJ, White JR, Syrotynska ID
Publication type: Article
Publication status: Published
Journal: Polymer Degradation and Stability
Year: 2004
Volume: 86
Issue: 2
Pages: 377-383
ISSN (print): 0141-3910
ISSN (electronic): 1873-2321
Publisher: Elsevier
URL: http://dx.doi.org/10.1016/j.polymdegradstab.2004.05.011
DOI: 10.1016/j.polymdegradstab.2004.05.011
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