Journal
POLYMER DEGRADATION AND STABILITY
Volume 94, Issue 2, Pages 278-283Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2008.10.009
Keywords
Wool; Photocatalysis; Photoyellowing; Titanium dioxide; Nanoparticles; Chemiluminescence
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Photoyellowing of wool is a serious problem for the wool industry. This study assessed the role of photocatalytic nanocrystalline titanium dioxide (P-25) as a potential antagonist or catalyst in the photoyellowing of wool. Untreated, bleached and bleached and fluorescent-whitened wool slivers were processed into fine wool powders for the purpose of even and intimate mixing with the TiO2 nanoparticles in the solid state. Pure wool and wool/TiO2 mixtures were then compressed into solid discs for a photoyellowing study under simulated sunlight and under UVB and UVC radiations. Yellowness and photo-induced chemiluminescence (PICL) measurements showed that nanocrystalline TiO2 could effectively reduce the rate of photoyellowing by inhibiting free radical generation in doped wool, and that a higher concentration of TiO2 contributed to a lower rate of photooxidation and reduced photoyellowing. Hence nanocrystalline TiO2 acts primarily as a UV absorber on wool in dry conditions and not as a photocatalyst. Crown Copyright (C) 2008 Published by Elsevier Ltd. All rights reserved.
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