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Mechanism on the permeation of ethanol in nitrile gloves studied using positron annihilation lifetime spectroscopy
Author(s) -
Pham Binh,
Phalen Robert,
Sasanuma Naoko,
Dorsainvil Yacinthe,
Tol Jacqueline,
Zhang Renwu
Publication year - 2015
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.41282
Subject(s) - permeation , nitrile , diffusion , polymer , volume (thermodynamics) , chemistry , nitrile rubber , molecule , spectroscopy , polymer chemistry , materials science , chemical engineering , analytical chemistry (journal) , natural rubber , organic chemistry , thermodynamics , membrane , physics , biochemistry , quantum mechanics , engineering
Positron annihilation lifetime spectroscopy (PALS) was applied to study the mechanism of ethanol diffusion through commercial nitrile rubber gloves. Even though the untreated raw samples were very different in their colors and area densities (g/cm 2 ), the correlation between the ethanol diffusion coefficient from permeation test and the free volume from PALS measurement is well consistent with the Vrentas‐Duda model. Via combining the PALS technique and the Vrentas‐Duda theory, it is revealed that (a) the diffusion coefficient is correlated to the number of free volume holes rather than the average size of holes, (b) the diffusion process is not regulated by the size of ethanol molecule but by the size of critical volume for polymer segments to migrate, (c) nitrile group does not present in the free volume hole where the diffusion of ethanol molecule takes place, but is embedded in polymer matrix, and therefore, does not directly interact with ethanol molecule, and (d) nitrile group affects the average size, but not the number of free volume holes. The experiment demonstrates that the PALS technique, being mainly used in pure academic researches, might have application in the glove industry due to its ability in measuring terminal free volume quantities, which are directly related to the permeation of small organic molecules through protective gloves. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41282.