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Influence of fullerene on the kinetics of thermal and thermo-oxidative degradation of high-density polyethylene by capturing free radicals
Ist Teil von
Journal of thermal analysis and calorimetry, 2013-12, Vol.114 (3), p.1287-1294
Ort / Verlag
Dordrecht: Springer Netherlands
Erscheinungsjahr
2013
Link zum Volltext
Quelle
SpringerLink
Beschreibungen/Notizen
The influence of fullerene (C
60
) on the thermal and thermal-oxidative degradation of high-density polyethylene (HDPE) was studied using non-isothermal thermogravimetric analysis under nitrogen (N
2
) and air atmosphere. Kinetic parameters of the degradation were evaluated using the Flynn–Wall–Ozawa method, which does not require the knowledge of the reaction mechanism. The results showed that the addition of C
60
enhanced the thermal stability of HDPE and increased the activation energy both in N
2
and air atmosphere and especially affected the initial stage of degradation. In N
2
, C
60
-trapped carbon-centered radical originated from the degradation of HDPE to improve the thermal stability and increase the activation energy. While in air, C
60
trapped the alkyl radicals and alkyl peroxide radicals to inhibit the hydrogen abstraction (especially the initial stage of thermo-oxidative degradation) and form more stable species, which improved the thermal stability and increased the activation energy during the thermal degradation of HDPE. Comparing with that of pure HDPE, the changes of activation energy for HDPE/C
60
nanocomposites were higher in air than in N
2
, especially in the initial stage.