COLD CRYSTALLIZATION OF POLY (ETHYLENE TEREPHTHALATE)

Kinetics of Relaxation and Crystallization of Poly(ethylene Terephthalate)

The kinetics of structural relaxation and crystallization of poly(ethylene terephthalate) (PET) is studied. It is demonstrated that the activation energy depends strongly on fictive temperature Tf . The dependence of the glass transition temperature Tg on the heating rate q + is investigated for samples that were previously cooled down at a rate q = 12.5 K/min. Angell et al [1] compare the ther...

Isothermal crystallization kinetics of poly(ethylene terephthalate) and poly(methyl methacrylate) blends

Different kinetic models like the Avrami, Tobin and Urbanovici-Segal models have been applied for determining the isothermal crystallization kinetics of virgin poly(ethylene terephthalate) (PET) and PET/poly(methyl methacrylate) (PMMA) blends. The different compositions investigated were PET90/PMMA10, PET75/PMMA25 and PET50/PMMA50 [wt/wt%]. The experimental data was fitted using Solver, a non-l...

Poly(ethylene terephthalate) Film Recycling

The role of the amorphous phase in the re-crystallization process of cold-crystallized poly(ethylene terephthalate).

The process of re-crystallization in poly(ethylene terephthalate) is studied by means of X-ray diffraction (SAXS and WAXS) and dynamical mechanical thermal analysis. Samples cold-crystallized for 9h at the temperatures T(c) = 100°C and T (c) = 160°C, i.e. in the middle of the alpha relaxation region and close to its upper bound, respectively, are analyzed. During heating from room temperature, ...

Chemical Degradation of Poly(Ethylene Terephthalate)

The possibility of converting polyethylene terephthalate (PET) waste into terephthalic acid as a primary material by using different techniques through trans-esterification, with an alcohol and through hydrolysis in basic medium, has been investigated. In addition, utilization of activating agents such as inorganic salts and phase transfer catalysts has been investigated. Mineral water and beve...