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Stabilizer thickness profiles in polyethylene pipes transporting drinking water disinfected by bleach
Author(s) -
Colin X.,
Verdu J.,
Rabaud B.
Publication year - 2011
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.21902
Subject(s) - bleach , stabilizer (aeronautics) , evaporation , materials science , diffusion , polyethylene , polymer , composite material , extraction (chemistry) , chemical engineering , chemistry , chromatography , organic chemistry , thermodynamics , mechanical engineering , physics , engineering
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. POLYM. ENG. SCI., 2011. © 2011 Society of Plastics Engineers.