DSC kinetic study of the transitions involved in the thermal treatment of polymers. Methodological considerations

Oxidative degradation of EVA copolymers in the presence of MCM-41

“…In the present work, the degradation of commercial PE and EVA under air atmosphere and the influence of the presence of mesoporous MCM-41, which has been widely considered as catalyst in the pyrolysis of polymers [8,9], has been studied using thermogravimetric analysis (TGA), focusing the main objective on the analysis of the EVA behaviour. MCM-41 has been selected because its great pore size, in the range of mesopores, that may avoid the steric hindrances associated to the acetate groups of the EVA chains and, consequently modify its oxidative degradation behaviour.…”

DSC study of transitions involved in thermal treatment of foamable mixtures of PE and EVA copolymer with azodicarbonamide

“…Taking into account the second consecutive heating run of the EVA mixtures, the first peak for EVA contribution appeared at the same temperature but underwent a notable decrease in height and total area in the same way as what occurred in the pure EVA. 18 The second and third peaks coincided (temperature and area) with those in the first run. Therefore, the transition and melting processes and crystallinity for the EVA copolymer apparently did not undergo any modification as a consequence of the foaming process.…”

“…Because the ADC was still unaltered at this temperature, the temperature and also the heat corresponding to this PE melting process were practically the same as those obtained for pure PE (Table T6 VI). 18 After the melting of the polymer, two more peaks appeared in the first run of the DSC curves that corresponded to the exothermic (primary) and endothermic (secondary) decomposition of the ADC. The first two exothermic processes clearly observed in the pure ADC (p1 and p2 in Fig.…”

“…7,9 Differential scanning calorimetry (DSC) is a commonly used technique to study and characterize the thermal transitions undergone by polymers, such as melting, crystallization, and reordering in their structure. [10][11][12][13][14][15][16][17] In previous works, [18][19][20] the thermal transitions and crystallinity of a commercial EVA and PE and their binary mixtures were studied by DSC, and the methodology used to perform the kinetic study of the data was discussed.…”

A study of the crystal phase separation of mLLDPE/EVA blend

“…However, owing to the similarity in the structure and properties of the components, the phase separation or phase behavior of many commercial binary polyolefin blends could not be directly discerned in the melt state, e.g., HDPE/LDPE blend. As the crystal kinetic process could provide relevant information on phase separation, differential scanning calorimetry (DSC) analysis has been exercised to investigate the crystal phase separation of polyolefin blends via the measurement of the energy changes in the phase transition process, along with the profile change of exothermic crystallizing peaks [6][7][8]. However, the microcosmic causation or details In view of the congregation structure formed in non-isothermal crystallization, the macromolecular chain segments in the crystal region of polyolefin blends possess special conformational characteristics and form three-dimensional ordered structure.…”