Abstract
The photo-behaviour of 2,6-di-tert-butyl-4-methylphenol, commercially known as BHT, has been examined in diluent phase and experimental gas phase polypropylene films by uv-derivative spectroscopy. Whilst the lower photolytic stability of BHT in the latter type polymer is associated with the catalytic effect of higher levels of residual titanium and aluminium, an additional reaction due to loss of one or both ortho-tert-butyl groups is more associated with trace levels of iron. The commercial implications of the experimental findings are discussed.
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