| Summary: | 碩士 === 國立臺灣大學 === 化學工程學研究所 === 87 === Poly(ethylene terephthalate) was synthesized from ethylene glycol、terephthalic acid through esterification and polycondensation reactions. Catalyst systems studied in this research included different heat-treated Sb/Zn or Sb/Co co-catalysts, and Sb2O3 catalyst.
The main objectives of this research are to estimate polycondensation reaction rate constant, and to determine the thermal stability of PET samples, and the side product concentrations in the samples. The result shows that the second order reaction kinetics can fit PET polycondensation reaction rate well. Polycondensation rate constant of PET in catalyst systems of Sb/Co calcined at 400℃ and Sb/Zn calcined at 300℃ are higher than that of Sb2O3 catalyst system by 1.5 and 3 times respectively. The thermal stability and caboxylic acid concentration in PET from different heat-treated co-catalyst system were about the same as those from Sb2O3 catalyst. Moreover, it is found that the relationship of thermal stability with DEG concentration in PET does not correlate well for Sb/Co co-catalyst system；for Sb/Zn co-catalyst system, the less the DEG concentration, the better the thermal stability.
|
|---|
