Photodegradation of bisphenol A polycarbonate

被引:137
作者
Diepens, Marjolein
Gijsman, Pieter
机构
[1] Eindhoven Univ Technol, Dept Chem Engn, Lab Polymer Technol, NL-5600 MB Eindhoven, Netherlands
[2] DPI, NL-5600 AX Eindhoven, Netherlands
[3] DSM Res & Patents, NL-6160 MD Geleen, Netherlands
关键词
bisphenol A polycarbonate; photodegradation; photo-Fries; photo-oxidation; FT-IR; UV spectroscopy;
D O I
10.1016/j.polymdegradstab.2006.12.003
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
When bisphenol A polycarbonate is subjected to weathering conditions this polymer shows two different degradation mechanisms depending on the used irradiation wavelengths, i.e. photo-oxidation and photo-Fries rearrangement. The relative importance of these mechanisms in outdoor exposure conditions is still unknown. In this study bisphenol A polycarbonate is exposed to simulated weathering conditions. Different analysing techniques show that photo-oxidation is the most dominant degradation reaction. However, fluorescence spectroscopy shows that small amounts of photo-Fries rearrangement products are formed. With model compounds blended in polypropylene it is shown that the photo-Fries reaction increases the photo-oxidation rate, thus in PP the photo-Fries reaction can proceed through radical intermediates. However, this is not the case in PC, ageing at condition causing an increased photo-Fries reaction rate did not result in a higher oxidation rate. This implies that in PC the photo-Fries reaction does not initiate its oxidation and thus does not proceed through radicals. (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码:397 / 406
页数:10
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