| Popis: |
The transesterification of S-phenyl thiobenzoate with 1-butanol, catalysed with metal salts, was studied as a model reaction for the polyester synthesis. The metal salts were found to interact with both the alcohol and the thioester. Mn(OCOCH3)2 · 4H2O, the most active catalyst, shows a higher kinetic order as well as a greater temperature dependence than the less active catalyst LiOCOCH3 · 2H2O, whereas the uncatalysed reaction shows the smallest temperature dependence. The application of the catalysts for polyester formation was examined with S,S-diphenyl 1,4-benzenedicarbothioate and triethyleneglycol. The molecular weight of the resulting polyester was found to increase with increasing catalytic activity of the metal salt in the corresponding monofunctional model reaction. |
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