The enhanced catalyst conditions for glycolysis process of poly 1, 4-cyclohexanedimethyl terephthalate (PCT) – PET derivative.
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Nowadays, poly 1, 4 - cyclohexanedimethyl terephthalate (PCT) has been widely used in the polymer industry. However, the cyclohexylene rings in its chain are presumedly huge blocks on the glycolysis process. Beside, D-Isosorbide (ISB), in spite of a potential, non-toxic diol for polyesters, its structure hinder the polyester manufacture. In this study, we investigated the influence of the steric hindrance groups in PCT through transesterification of PCT model compound, and compared with BHET, PET monomer, with zinc catalyst conditions. ISB showed the worst reactivity in glycolysis. The BHCHT transesterification had a reduction in speed, just one-third of that of BHET case with the primary zinc acetate catalyst. However, this retarded reaction rate remarkably rose up to 4 times with alkoxy species added to zinc catalyst. The rate of PCT glycolysis, applied combined zinc catalyst, was enhanced up to 3 times than that of the conventional zinc acetate and the conversion was 82% yield.