[article] 
inStudies in conservation > Vol.68 N°3-4(2023; April-May) (2023-04-03) . - Pages 458-473

Titre :	The Permeability of PET by Formic and Acetic Acid Vapors
Type de document :	texte imprimé
Année de publication :	2023
Article en page(s) :	Pages 458-473
Langues :	Anglais (eng)
Catégories :	Acide acétique Conservation et restauration -- Appareils et matériel Encapsulation (chimie) Formique, Acide Papier -- Conservation et restauration -- Recherche Polyéthylène térephtalate -- Perméabilité Revêtement en plastique -- Perméabilité Vapeur, Technique de la
Index. décimale :	7.025 Dommages. Conservation. Protection
Résumé :	ABSTRACT The permeability of biaxially oriented polyethylene terephthalate, PET, to vapors from 5%, 30%, and 100% formic acid solutions as well as the vapor from a 30% acetic acid solution was measured by gravimetric analysis in order to determine the transmission rate of the vapors through PET folders and enclosures made from Mylar™ and similar materials, and ultimately understand the microenvironment that is created inside an encapsulate. The data shows that the permeation of formic acid vapor is at least two orders of magnitude slower than the permeation of water vapor. Measurements of the permeation of 30% acetic acid vapor through PET seemed to be due to the permeation of the water only, and the permeation of the acetic acid, if it occurred, occurred too slowly to be measured. The size of the diffusing molecule determines the permeation. Since the permeability decreases as the size of the diffusing vapor molecule increases, a plot of permeability versus vapor size allows the permeability of various other vapors through PET to be predicted. Colorimetry showed that porous PET allowed ambient vapors to diffuse into the encapsulate, and the entire paper within the encapsulate was affected, not only the paper near the holes in the PET.

[article] The Permeability of PET by Formic and Acetic Acid Vapors [texte imprimé] . - 2023 . - Pages 458-473.
Langues : Anglais (eng)
in Studies in conservation > Vol.68 N°3-4(2023; April-May) (2023-04-03) . - Pages 458-473

Catégories :	Acide acétique Conservation et restauration -- Appareils et matériel Encapsulation (chimie) Formique, Acide Papier -- Conservation et restauration -- Recherche Polyéthylène térephtalate -- Perméabilité Revêtement en plastique -- Perméabilité Vapeur, Technique de la
Index. décimale :	7.025 Dommages. Conservation. Protection
Résumé :	ABSTRACT The permeability of biaxially oriented polyethylene terephthalate, PET, to vapors from 5%, 30%, and 100% formic acid solutions as well as the vapor from a 30% acetic acid solution was measured by gravimetric analysis in order to determine the transmission rate of the vapors through PET folders and enclosures made from Mylar™ and similar materials, and ultimately understand the microenvironment that is created inside an encapsulate. The data shows that the permeation of formic acid vapor is at least two orders of magnitude slower than the permeation of water vapor. Measurements of the permeation of 30% acetic acid vapor through PET seemed to be due to the permeation of the water only, and the permeation of the acetic acid, if it occurred, occurred too slowly to be measured. The size of the diffusing molecule determines the permeation. Since the permeability decreases as the size of the diffusing vapor molecule increases, a plot of permeability versus vapor size allows the permeability of various other vapors through PET to be predicted. Colorimetry showed that porous PET allowed ambient vapors to diffuse into the encapsulate, and the entire paper within the encapsulate was affected, not only the paper near the holes in the PET.