COMPARATIVE-STUDIES AND IDENTIFICATION OF POLYETHYLENES BY DIFFERENTIAL THERMAL-ANALYSIS AND X-RAY-DIFFRACTION ANALYSIS

In thermal analysis polyethylenes can be characterized by their meltin g temperature. With the polyethylene mixtures studied, we obtained the best results during solidification. Crystallization temperature decre ased in the order: high density PE, low density PE linear, radical low density PE. Calorimetric measurement of crystallization enthalpies al lowed the determination of the composition of each of the polyethylene s, in regenerated and recycled mixtures in relation with the frame of the plastic waste valorisation process. The rate of crystallization ob tained from X-ray diffraction spectra of these polymers is function of their volumic mass. A good agreement has been observed between these two techniques.