Polypropylene stabilization by hindered phenols – Kinetic aspects

Richaud, Emmanuel; Fayolle, Bruno; Verdú, J.

doi:10.1016/j.polymdegradstab.2010.11.011

Cited by 36 publications

(39 citation statements)

References 59 publications

(55 reference statements)

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“…In the case of 2,6 di-tert-butylphenols, it was shown that the efficiency per phenol group does not differ strongly from a family member to another [23]. Rate constants of stabilization were thus calculated from a literature review of degradation of several PP + phenol mixtures.…”

Section: Introductionmentioning

confidence: 99%

Kinetic modelling of phenols consumption during polyethylene thermal oxidation

Richaud¹

2013

European Polymer Journal

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Section: Introductionmentioning

confidence: 99%

Kinetic modelling of phenols consumption during polyethylene thermal oxidation

Richaud¹

2013

European Polymer Journal

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“…According to this work, and other previous papers (Richaud et al, 2008, Richaud et al, 2011, Richaud, 2013, the action of stabilizers is can be described by adding the following equations to the general mechanistic scheme: Richaud et al, 2008, Richaud et al, 2011, Richaud, 2013. The following set of differential equations Figure 9 were [POOH] 0 was considered as an adjustable parameter expressing the level of unstable moiety in several PE from different sources).…”

Section: Discussionmentioning

confidence: 99%

“…The resulting phenoxyl radical A° isomerizes, and then reacts with another peroxyl or with O 2 , with another phenoxyl by dismutation or coupling, or generate a new form of stabilizer (Allen et al, 1985;Pospı́šil et al, 1991;Pospı́šil, 1993;Pospı́šil et al, 1996;Pospı́šil et al, 2002). These mechanisms can be represented by a "kinetically equivalent" scheme (Richaud et al, 2011;Richaud, 2013) using a limited number of adjustable parameters:…”

Section: Due To Their O-h Bond Weaker Than Polyethylene C-h One Phenmentioning

confidence: 99%

“…In UHMWPE films thin enough (such those used in Costa et al (2009) to neglect all diffusion phenomena, k S1 … k S4 can be estimated "simply" by an inverse approach from ageing experiments (Richaud et al, 2008;Richaud et al, 2011;Richaud, 2013). For that purpose, Vitamin E stabilization reactions are added to the scheme previously established for additive free PE (Khelidj et al, 2006) …”

mentioning

confidence: 99%

“…It was published (Richaud et al, 2011) that k S2 corresponds to a fast reaction involving two reactive radicals and its value has only a minor influence on the simulations provided it has a physical sense.…”

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Comparison of stabilization by Vitamin E and 2,6-di-tert-butylphenols during polyethylene radio-thermal-oxidation

Richaud

2014

Radiation Physics and Chemistry

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. ABSTRACT This paper reports a compilation of data for PE + vitamin E and 2,6-di-tert-butyl phenols oxidation in radio-thermal ageing. Data unambiguously show that vitamin E react with P° and POO° whereas 2,6-di-tert-butyl phenols only react with POO°. Kinetic parameters of the stabilization reactions for both kinds of antioxidants were tentatively extracted from phenol depletion curves, and discussed regarding the structure of the stabilizer. They were also used for completing an existing kinetic model used for predicting the stabilization by antioxidants. This one permits to compare the efficiency of stabilizer with dose rate or sample thickness.2

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