Photo-stabilising action of metal chelates in polypropylene—Part IV: Influence of metal stearates in an exchange mechanism |
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| Authors: | Norman S Allen Alfonso Chirinos-Padron John H Appleyard Terence J Henman |
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| Institution: | 1. Department of Chemistry, John Dalton Faculty of Technology, Manchester Polytechnic, Chester St., Manchester M1 5GD, Great Britain;2. Department of Physics, Mathematics and Computing, John Dalton Faculty of Technology, Manchester Polytechnic, Chester St., Manchester M1 5GD, Great Britain |
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| Abstract: | The effect of calcium and nickel stearates on the photo-stabilising action and photo-decomposition of one calcium and two nickel metal chelates in polypropylene has been examined using infra-red and ultraviolet derivative spectroscopy. Whereas the presence of calcium stearate antagonises the photo-stabilising action of one nickel chelate, Irgastab 2002, it strongly synergises with the other, Cyasorb UV 1084. The presence of nickel stearate synergises with the calcium chelate, Irganox 1425, in unprocessed polymer whereas, in processed polymer, it exhibits antagonism. Rates of photo-decomposition of the metal chelates are also affected by metal stearates. The data suggests that, with these nickel chelates, there might be some degree of metal exchange with certain metal stearates. |
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