The elimination of t-butyl substituents from poly(1,4-phenylene terephthalate-co-t-butyl-l,4-phenylene terephthalate) and from a model compound, t-butylhydroquinone dibenzoate, was investigated. Thin-layer chromatography showed that the t-butyl groups could be thermally eliminated from the model compound at 320°C or at lower temperatures using Friedel-Crafts catalysts. The t-butyl substituents were not found to be removable from the polymer by thermal means, but the cleavage was achieved under the influence of trifluoromethanesulphonic acid, for which the best treatment temperature was below 25°C. Side reactions were also detected.
Посилання на статтю:
Thermotropic polyesters: controlled decomposition of poly(1,4-phenylene terephthalate-co-t-butyl-1,4- phenylene terephthalate) / Z. G. Li, J. E. Mclntyre* and J. G. Tomka // Polymer. – 1993. – Vol 34. – P. 551-556.