Thermal oxidation of polybutadiene. Part 2: Mechanistic and kinetic schemes for additive-free non-crosslinked polybutadiene

Coquillat, M.; Verdú, J.; Colin, Xavier; Audouin, L.; Nevière, Robert

doi:10.1016/j.polymdegradstab.2007.03.019

Cited by 54 publications

(61 citation statements)

References 16 publications

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“…A titre d'information, les paramètres d'Arrhenius et les ordres de grandeur de k 3à 30 • C des principaux types de liaisons méthyléniques C-H sont donnés au Tableau 2. Ces valeurs sont issues d'études antérieures menées au laboratoire [3][4][5][6][7].…”

Section: Sites D'oxydationunclassified

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Nouvelles avancées en modélisation cinétique de la thermo-oxydation des matrices époxy-diamine

Colin

Fayolle

Cinquin

2016

Matériaux & Techniques

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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.This is an author-deposited version published in: http://sam.ensam.eu Handle ID: .http://hdl.handle.net/10985/11074 To cite this version :Xavier COLIN, Bruno FAYOLLE, Jacques CINQUIN -Nouvelles avancées en modélisation cinétique de la thermo-oxydation des matrices époxy-diamine -Matériaux & Techniques -Vol. 104, n°2, p.202-10 -2016 Any correspondence concerning this service should be sent to the repository

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Section: Sites D'oxydationunclassified

“…-Recombinaisons (terminantes et non-terminante) : [3][4][5][6][7]. (i)À t = 0, en tout point z de l'épaisseur de la pièce : la littérature [8,9,[11][12][13][14].…”

Section: Schéma Mécanistiqueunclassified

Nouvelles avancées en modélisation cinétique de la thermo-oxydation des matrices époxy-diamine

Colin

Fayolle

Cinquin

2016

Matériaux & Techniques

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“…From a symmetrically auto-catalytic model, induction time was chosen as reaction from the beginning to the conversion at about two percent (α = 0.02). The auto-oxidation reaction schemes have been proposed and discussed in the literature concerning the thermal oxidation and degradation of polybutadiene and ABS [5,[6][7][8]11]. The oxidation mechanism consisted of the initiation, propagation and termination.…”

Section: Thermal Oxidation Of Pb Phase In Absmentioning

confidence: 99%

“…The rubber segment has been demonstrated to be the initial vulnerability under the attack of oxygen, giving rise to an allylic hydroperoxide [6][7][8]. In addition, cross-linking destroys the elastic property of the rubber phase with less impact resistance of ABS polymer in photo-or thermal-oxidation of PB [9,10].…”

Section: Introductionmentioning

confidence: 99%

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Study on Exothermic Oxidation of Acrylonitrile-butadiene-styrene (ABS) Resin Powder with Application to ABS Processing Safety

Duh

Chen

et al. 2010

Polymers

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Oxidative degradation of commercial grade ABS (Acrylonitrile-butadienestyrene) resin powders was studied by thermal analysis. The instabilities of ABS containing different polybutadiene (PB) contents with respect to temperature were studied by Differential Scanning Calorimeter (DSC). Thermograms of isothermal test and dynamic scanning were performed. Three exothermic peaks were observed and related to auto-oxidation, degradation and oxidative decomposition, respectively. Onset temperature of the auto-oxidation was determined to be around 193 °C. However, threshold temperature of oxidation was found to be as low as 140 °C by DSC isothermal testing. Another scan of the powder after degeneration in air showed an onset temperature of 127 °C. Reactive hazards of ABS powders were verified to be the exothermic oxidation of unsaturated PB domains, not the SAN (poly(styrene-acrylonitrile)) matrix. Heat of oxidation was first determined to be 2,800  40 J per gram of ABS or 4,720  20 J per gram of PB. Thermal hazards of processing ABS powder are assessed by adiabatic temperature rise at process conditions. IR spectroscopy associated with heat of oxidation OPEN ACCESSPolymers 2010, 2 175 verified the oxidative mechanism, and these evidences excluded the heat source from the degradation of SAN. A specially prepared powder of ABS without adding anti-oxidant was analyzed by DSC for comparing the exothermic behaviors. Exothermic onset temperatures were determined to be 120 °C and 80 °C by dynamic scanning and isothermal test, respectively. The assessment successfully explained fires and explosions in an ABS powder dryer and an ABS extruder.

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Ageing and Degradation of Multiphase Polymer Systems

Colin¹,

Teyssèdre²,

Fois³

2011

Handbook of Multiphase Polymer Systems

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Ageing can be defined as a slow and irreversible variation as a function of time (in use conditions) of a material structure, morphology or composition leading to a detrimental change in its use properties. The cause of this change can be the own material instability or its interaction with the environment of exposure. The definition so given is that viewed from an application point of view. There are issues associated with this definition that deserve to be mentioned. First, there are ageing mechanisms, essentially of a physical nature as detailed below, that are not irreversible in nature (e.g. crystallinity change, structural recovery, water uptake without loss of the integrity of the chemical structure, etc.), but may lead to a change in the use properties of these materials. The reversibility is in principle achievable by, e.g. thermal treatment or drying. However, this is not necessarily compatible with the use of materials as pieces, or the material will evolve again anyway when exposed to use environmental stresses. Second, irreversible material evolution in itself does not necessarily imply a detrimental change of use properties. It can even result in an improvement of properties. This represents indeed a marked difficulty when attempting to define so-called 'ageing markers' for materials, i.e. material properties to be monitored for health monitoring purpose: the marker must be 21.1.2 Classification of Ageing Types There is a wide variety of polymer ageing types. Each one is a complex phenomenon, but decomposable into a set of elementary mechanisms that can be interactive: chemical reactions, macromolecular motions, molecular species transport into the polymer, crystallinity change, etc. Unfortunately, there is no entirely satisfactory method for their classification, because the most rigorous criteria, in theory, are often open to criticism in practice. The simplest and most agreed method consists in distinguishing two main ageing families according to the nature of involved mechanisms: r chemical ageing is responsible for a variation of the macromolecule chemical structure r physical ageing affects the macromolecule conformation, the material morphology or composition, without altering the macromolecule chemical structure. Then, the different ageing types, defined in terms of the main ageing driving environmental stress, involve one of the two families of mechanisms defined above: r Thermal ageing is initiated by material's own instability. Its kinetics essentially depends on temperature and atmosphere composition. It can be a chemical or a physical ageing, or a combination of them. r Humid ageing is due to a chemical or a physical interaction of polymer with water, the latter being either in a liquid or a vapor state. r Photo-chemical ageing results from polymer interaction with light rays (in general, UV solar radiations). Atmospheric oxygen plays, in general, an important role (photo-oxidation). r Radio-chemical ageing is due to the polymer interaction with ionizing (γ, β, α, neutrons, etc.) rays. ...

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Thermal oxidation of polybutadiene. Part 2: Mechanistic and kinetic schemes for additive-free non-crosslinked polybutadiene

Cited by 54 publications

References 16 publications

Nouvelles avancées en modélisation cinétique de la thermo-oxydation des matrices époxy-diamine

Nouvelles avancées en modélisation cinétique de la thermo-oxydation des matrices époxy-diamine

Study on Exothermic Oxidation of Acrylonitrile-butadiene-styrene (ABS) Resin Powder with Application to ABS Processing Safety

Ageing and Degradation of Multiphase Polymer Systems

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