Thermal analysis and non-isothermal crystallization kinetic of PET/UiO-66 nanocomposite

Abstract

The thermal and crystallization properties of poly (ethylene terephthalate) (PET) in the presence of metal–organic frameworks (MOFs) such as UiO-66(Zr) have been systematically studied. Under the best conditions, UiO-66(Zr) functions as a key nucleating agent in the PET scheme. In this work, a merge between UiO-66 and PET was used to increase compatibility, however, the tetra oxidation of Zr4+ revealed by defects in UiO-66 was used to enhance the reaction between PET and UiO-66 as well. Additionally, PET containing varying amounts of UiO-66 were made-up. UiO-66 has high nucleation effectiveness in the matrix of PET due to its large specific surface area and coordination of Zr4+. When compared between the formation PET and PET/UiO-66 matrix, the rate of crystallization for PET/UiO-66 nanocomposite was considerably accelerated, and the temperature of crystallization for PET-UiO-66 was remarkably increased or decreased with increasing UiO-66 content, indicating that adding UiO-66 to PET accelerates crystallization. The thermal stability of PET/UiO-66 nanocomposites in terms of characteristic temperature and kinetic parameters, as well as the dispersion of UiO-66, were examined using both (DSC) and (TGA) under non-isothermal circumstances. The degrading response rate (dx/dt)p and the kinetic exponent n of PET/UiO-66 nanocomposites are estimated and analyzed.

Keywords

• PET
• UiO-66
• Thermogravimetric analysis
• Differential scanning calorimetry
• Non-isothermal conditions
• Thermal stability