AbstractThe crystallization behavior of polyethylene terephthalate (PET), was investigated under isothermal and dynamic cooling conditions, as a function of molecular weight, polycondensation catalyst system, and polymerization conditions. Crystallization kinetic parameters were calculated for both cases by utilizing Avrami‐type expressions. Analysis of the crystallization kinetic data indicates that the same mechanism is operative under isothermal and dynamic cooling crystallization conditions.The dynamic cooling crystallization method can establish the minimum cooling rate required to produce PET without detectable crystallinity. The results show that the cooling requirements for producing noncrystalline PET are dependent on the molecular weight of the resin, but more importantly, are dependent on the catalyst system used in the polycondensation step. These results are in good agreement with the results obtained under isothermal condition
展开▼
