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Dynamics of solvent diffusion in an aromatic polyimide
Author(s) -
Moon Yoon Duk,
Lee Young Moo
Publication year - 1994
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.1994.070510517
Subject(s) - polyimide , swelling , solvent , solubility , polymer chemistry , diffusion , imide , hildebrand solubility parameter , gravimetric analysis , materials science , anisotropy , fick's laws of diffusion , isotropy , chemistry , chemical engineering , composite material , organic chemistry , thermodynamics , physics , layer (electronics) , quantum mechanics , engineering
Diffusion behaviors of two polyimides (PIs) synthesized from 3,3′,4,4′‐benzophenonetetracarboxylic dianhydride (BTDA), 4,4′‐oxydianiline (ODA), and 4,4′‐diaminodiphenylsulfone (DDS) were investigated by the gravimetric method. The weight uptake of penetrants (solvents) was nearly proportional to the exposure time in solvent. This phenomenon was considered as the Case II diffusion (non‐Fickian) mechanism. Two PI films had an affinity to N ‐methyl‐2‐pyrrolidinone (NMP) rather than to dimethylsulfoxide (DMSO). The solubility parameter differences between two polyimides and NMP are less than 5, whereas that between polyimides and DMSO are greater than 5, as calculated by Hoy's group contribution method. The solvent uptake of anisotropic films contributed to an increase in the thickness. The swollen amount of anisotropic films increased with the swelling temperature but tended to decrease with the imide content and the thickness of the anisotropic films. Isotropic films of two PIs did not swell in both NMP and DMSO. © 1994 John Wiley & Sons, Inc.