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Sorption and transport of CO 2 in poly(ethylene terephthalate) crystallized by sorption of high‐pressure CO 2
Author(s) -
Hirose Takuji,
Mizoguchi Keishin,
Kamiya Yoshinori,
Terada Katsuhiko
Publication year - 1989
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.1989.070370606
Subject(s) - sorption , ethylene , permeation , solubility , annealing (glass) , materials science , thermal diffusivity , polymer chemistry , chemical engineering , permeability (electromagnetism) , volume (thermodynamics) , poly ethylene , thermodynamics , chemistry , composite material , organic chemistry , adsorption , membrane , biochemistry , physics , engineering , catalysis
Sorption and permeation of CO 2 in poly(ethylene terephthalate) crystallized by sorption of high‐pressure CO 2 were examined below 1 atm at temperatures from 15 to 65°C. A large solubility and a high permeability of CO 2 in this specimen were observed compared to poly(ethylene terephthalate) crystallized by thermal annealing to a similar degree. A large unrelaxed volume is expected to be left in the specimen after removal of high‐pressure CO 2 compared to the data of other PET samples. The thermal history during the measurements up to 65°C, which causes relaxation of the specimen, was shown to decrease CO 2 solubility. On the other hand, permeation data after annealing show not only decreased permeability but also increased apparent diffusivity. The results mean a lower mobility of gases sorbed in the unrelaxed volume than that of ordinarily dissolved gases, which corresponds to the partial immobilization model.