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Ethylene glycol aluminum was prepared efficiently and characterized by FT-IR and NMR. It exhibited higher catalytic activity and had profitable effect than titanium glycolate and ethylene glycol antimony for the synthesis of poly(ethylene terephthalate) (PET). It was only used as polycondensation catalyst because it was sensitive to water. For this catalyst, the degree of esterification of the theoretical...
Chelate tetra(acetylacetonato) tin (IV) was prepared and used as catalyst for polytrimethylene terephthalate synthesis. It exhibited higher catalytic activity than tetrabutyl titanate, butyltinhydroxide oxide and dibutyltin oxide. Decrease in reaction time, content of terminal carboxyl group, color intensity and increase in intrinsic viscosity were observed. The unique molecular structure can be considered...
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