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Solid-Phase Thermal Polymerization of Macrocyclic Ethylene Terephthalate Dimer Using Various Transesterification Catalysts - Solid-phase thermal ring-opening polymerization of macrocyclic ethylene terephthalate dimer with and without catalyst was investigated for the first time. 1,3-Dichloro-1,1,3,3-tetrabutyldistannoxane exhibited the highest catalytic activity, and a colorless polymer with a weight-average molecular weight of 36,100 was obtained in 100% yields by heating for 3 min at 200(degree) C/
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