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Sorption and diffusion of water vapor in poly(ethylene terephthalate) film
Author(s) -
Shigetomi Takeshi,
Tsuzumi Hiroyuki,
Toi Keio,
Ito Tomoyasu
Publication year - 2000
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/(sici)1097-4628(20000404)76:1<67::aid-app9>3.0.co;2-5
Subject(s) - sorption , diffusion , water vapor , thermogravimetric analysis , ethylene , materials science , solubility , fick's laws of diffusion , humidity , vapor pressure , analytical chemistry (journal) , polymer chemistry , poly ethylene , chemical engineering , chemistry , thermodynamics , adsorption , organic chemistry , physics , engineering , catalysis
The sorption and diffusion of water vapor in poly(ethylene terephthalate) (PET) film were measured by applying a thermogravimetric analyzer (TG‐DTA), which customarily has been used to detect the weight loss of a sample with the increase of temperature under a given atmosphere. In this case, we detected the weight gain of PET film by sorption of water vapor under a given humidity at a constant temperature. Sorption‐rate curves were successfully obtained in spite of the low solubility of PET film and the presence of Fickian‐type curves. The solubility was better described according to the dual‐mode sorption model. The diffusion coefficients were determined in their initial slopes by the short‐time method. We found that the diffusion coefficient depended on vapor pressure. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 76: 67–74, 2000