Stabilizer thickness profiles in polyethylene pipes transporting drinking water disinfected by bleach
Article dans une revue avec comité de lecture
Date
2011Journal
Polymer Engineering and ScienceRésumé
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 profiles reveal that bleach destroys the stabilizer in a superficial layer of about 0.5 mm depth at the water-polymer interface. In the rest of the wall, stabilizer is lost by physical processes, i.e., transport by diffusion into the bulk, extraction at the water-polymer interface, and evaporation at the polymer-air interface. The whole loss kinetics is governed by extraction and evaporation. The classical scheme for evaporation-diffusion process has been used to model physical loss processes, but with boundary conditions different from the literature ones. Concerning chemical aspects, some mechanisms proposed in the literature are criticized. The identification of the bleach reactive species remains an open question.
Fichier(s) constituant cette publication
Cette publication figure dans le(s) laboratoire(s) suivant(s)
Documents liés
Visualiser des documents liés par titre, auteur, créateur et sujet.
-
Chapitre d'ouvrage scientifiquePolyethylene (PE) pipes are commonly used for the transport of drinking water under pressures of few bars. There is an abundant literature on the results of isobaric and isothermal ageing tests made in pure water. These ...
-
Article dans une revue avec comité de lectureLAFARIE, Marie Christine; GRANDIDIER, Jean Claude; OLIVIER, Loic; VERDU, Jacques; CINQUIN, Jacques; COLIN, Xavier (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 ...
-
Chapitre d'ouvrage scientifiqueIn this chapter, several aspects of the ageing phenomena induced by water in organic matrix composites are examined, essentially from the physico-chemical point of view. It is first important to recognize that there are ...
-
Chapitre d'ouvrage scientifiqueThis 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 ...
-
Chapitre d'ouvrage scientifiqueIt 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 ...