| Summary: | 碩士 === 國立臺灣大學 === 化學工程學系 === 86 === This research investigated the effects of different catalyst
systems and process variables on the polymerization of PET.
In antimony catalyst, the results revealed that adding Sb2O3
catalyst before esterification and adding EG after esterification
would promote the activity of Sb2O3 catalyst system. Furthermore,
it was found that increasing the vacuum in pre-polycondensation
would increase the rate of polycondensation.
In Sb-Zn cocatalyst system, when the cocatalyst calcined
at temperature less than 500℃, their activities were better
than that of pure Sb2O3, and the 300℃calcined cocatalyst had the
best activity. From the characterization by TGD,TPR and XRD,
it was found that Sb2O3 and ZnAc2.2H2O had converted into Sb2O4
and ZnO after calcined at 500℃. And from the TPR,XRD and
UV-vis.,it was found that when the calcination temperatures
were above 200℃, the interaction and the bonding between Sb and
Zn has been established.
It was found that when adding Sb2O3/ZnAc2.2H2O、Sb2O3/CoAc2.4H2O、
Sb2O3/SnAc2 cocatalyst before esterification separately, their
rates of esterification and polycondensation would be faster
than those of pure Sb2O3, and the Sb-Zn cocatalyst had the best
activity.
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