Mechanisms and kinetics of organic matrix thermal oxidation
Chapitre d'ouvrage scientifique
It is now well recognized that during thermal aging at moderate temperatures, for example, typically below the glass transition temperature, organic matrix composites perish mainly by matrix embrittlement resulting from its thermo-oxidation. The present chapter aims to briefly introduce this domain. The chapter consists of a brief history of polymer oxidation and description of mechanisms and kinetics. The radical character of oxidation processes; the main elementary steps: propagation, termination, initiation processes, and initial steps; structure-property relationships; the nature of oxidation products; and experimental methods for the study of oxidation mechanisms are also discussed. The standard kinetic scheme, case of oxygen excess and general shape of oxidation kinetic curves, the induction period, departure from Arrhenius law, and case of oxygen lack are described. Consequences of oxidation on matrix thermomechanical properties including chain scission and cross-linking physical approaches are presented.
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Thermo-oxidation behaviour of composite materials at high temperatures: A review of research activities carried out within the COMEDI program Article dans une revue avec comité de lectureLAFARIE, Marie Christine; GRANDIDIER, Jean Claude; OLIVIER, Loic; COLIN, Xavier; VERDU, Jacques; CINQUIN, Jacques (Elsevier, 2010)The present paper presents a review of the main activities carried out within the context of the COMEDI research program, a joint collaboration involving three research teams focusing on the thermo-oxidation behaviour of ...
Article dans une revue avec comité de lectureAUDOUIN, Ludmila; COLIN, Xavier; FAYOLLE, Bruno; RICHAUD, Emmanuel; VERDU, Jacques (EDP Sciences, 2010)It has been supposed, for a long time, that kinetic modelling of polymer ageing for nonempirical lifetime prediction was out of reach for two main reasons: hypercomplexity of mechanisms and heterogeneity of reactions. The ...
Article dans une revue avec comité de lectureCOLIN, Xavier; MONCHY-LEROY, Carole; VERDU, Jacques (Elsevier, 2011)Three high density polyethylene (PE) samples of different origins, with weight average molar masses ranging from 38 to 63kgmol-1 and displaying a semi-ductile behavior with strain at break εR values of the order of 100-140%, ...
Stabilizer thickness profiles in polyethylene pipes transporting drinking water disinfected by bleach Article dans une revue avec comité de lectureCOLIN, Xavier; VERDU, Jacques; RABAUD, Benjamin (Wiley-Blackwell, 2011)Polyethylene connection pipes of wall thickness ranging from 3.0 to 4.5 mm, used for 0, 5, 9, 12, and 18 years in the French network of drinking water disinfected by bleach, have been analyzed. The stabilizer thickness ...
Chapitre d'ouvrage scientifiqueCOLIN, Xavier; VERDU, Jacques (Nova Science, 2011)This chapter deals with the main causes of chemical ageing in organic matrix composites: hydrolysis, essentially in polyesters and polyamides, and oxidation in all kinds of polymer matrices. The first section is devoted ...