Dynamic thermal decomposition of blends of polyamide 6 with functionalized and non-functionalized PP

摘要

The processes of thermal degradation taking place in polyamide 6 (PA6) blends with functionalized (PPl-g-DEM) and non- functionalized polypropylene (PP2) have been studied by thermogravimetric analysis. Coats-Redfern, Van Krevelen and Horowitz- Metzger integral methods were used to determine kinetic parameters. It was observed that the starting temperature of the decom- position of the blends decreases from 380 to 340℃ when increasing the concentration of functionalized polypropylene. When non- functionalized polypropylene is used, the decrease is from 360 to 300"C. On the other hand, although the activation energy of the functionalized polypropylene is smaller than that of the non-functionalized, it was demonstrated that the thermal stability is bigger for the mixtures of PA6 with PPl-g-DEM, the latter being at 30 wt composition of PP. Also, the use of functionalized poly- propylene in the blends with polyamide evidences a better dispersion and a smaller particle size, this behavior positively influences the thermal stability of these blends.