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Effect of stabilizer and pigment on photo-degradation depth profiles in polypropylene

Lookup NU author(s): Emeritus Professor Jim White


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Photo-degradation depth profiles in 3 mm thick polypropylene injection mouldings containing (i) hindered amine light stabilizer (HALS); (ii) titanium dioxide (TiO2) pigment; and (iii) both HALS and TiO2, have been compared with those obtained with similar mouldings containing no ultraviolet (UV) stabilizer or pigment. Laboratory UV exposures produced steep degradation profiles in unstabilized samples with very little degradation occurring near the centre even after prolonged exposure. In samples stabilized by HALS the degradation was almost uniform through the thickness. At the surface, the level of degradation in the stabilized bars was much less than in unstabilized bars whereas in the centre the degradation was much more than in unstabilized bars. This is attributed to diffusion-controlled oxidation. The presence of TiO2 confined degradation to a thin region close to the exposed surface. © 2001 Elsevier Science Ltd. All rights reserved.

Publication metadata

Author(s): White JR; Turton TJ

Publication type: Article

Publication status: Published

Journal: Polymer Degradation and Stability

Year: 2001

Volume: 74

Issue: 3

Pages: 559-568

ISSN (print): 0141-3910

ISSN (electronic): 1873-2321

Publisher: Elsevier


DOI: 10.1016/S0141-3910(01)00193-8


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