| dc.description | IKP and E2 function methods were used to study thermal stability of
HDPE–HA nanocomposites synthesized by in situ ethylene polymerization at different
volumes of solvent and temperatures. Thermal analysis was carried out at five
different heating rates, b = 3, 5, 7, 10, and 13 C/min, under N2 atmosphere.
Kinetics parameters calculated by IKP method presented a slight increase on activation
energy when HA was incorporated in HDPE. A similar tendency was
observed in the results obtained from the E2 function method, where the activation
energy of the nanocomposites increased 100 kJ/mol with respect to unfilled polymer
(420–460 kJ/mol). These results implied higher stability of HDPE due to HA
incorporation. HDPE and HDPE–HA degradation mechanisms are represented by a
set of functions, those with the highest probability were: nucleation and nucleus
growth (S3) 23 %, reaction order (S5) 16 %, reaction in the interface (S6. S7, S8)
11–14 %, and potential law (S14, S17) 3 %. | |
