2010
DOI: 10.1002/app.32459
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Kinetic modeling of polypropylene thermal oxidation during its processing by rotational molding

Abstract: ABSTRACT:The main drawback of rotational molding is a long stay (several dozens of minutes) of polymer in melt state at high temperature in atmospheric air. To prevent any significant polymer thermal degradation, it is necessary to define, preliminary, a processing window in a temperature-molar mass map. The objective of this article is to elaborate and check the validity of a general thermal degradation model devoted to determine, in a near future, some important boundaries of this processing window. This mod… Show more

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Cited by 18 publications
(18 citation statements)
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“…The apparent activation energy of k Dec is of the order of 100 kJ mol À1 which is in agreement with those for sulphides [21,43] in various hydrocarbon polymers, or phosphites in PP [44,45] as well as for the polymer oxidation process. The fact that phosphites and sulfides keep their stabilizing efficiency over a wide temperature range is therefore not so surprising.…”
Section: Codesupporting
confidence: 81%
“…The apparent activation energy of k Dec is of the order of 100 kJ mol À1 which is in agreement with those for sulphides [21,43] in various hydrocarbon polymers, or phosphites in PP [44,45] as well as for the polymer oxidation process. The fact that phosphites and sulfides keep their stabilizing efficiency over a wide temperature range is therefore not so surprising.…”
Section: Codesupporting
confidence: 81%
“…3. The ratio k 2 /k 4 was also reported as an invariant quantity resulting from the competition between very fast reactions involving alkyl radicals: oxygen addition (2) and bimolecular recombination (4).…”
Section: Strategy For the Optimization Proceduresmentioning
confidence: 99%
“…Further developments were about the impact of oxygen partial pressure on polypropylene thermal oxidation kinetics at solid 3 and molten states. 4 In both cases, the rate constants were determined by applying an inverse resolution method in order to facilitate the model convergence with a unique set of parameters values, as done successfully for instance for polyethylene. 5 This approach has been generalized in our laboratory to determine all the unknown parameters, essentially rate constants, for a given kinetic model, and to simulate the experimental results with minimum deviation.…”
Section: Introductionmentioning
confidence: 99%
“…Also, the choice of this temperature is crucial to avoid polymer degradation. 44 • At point C, heating is stopped. Mold in rotation enters in cooling room.…”
Section: Rotational Moldingmentioning
confidence: 99%