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Diffusion through rubbery and glassy polymer membranes
Author(s) -
Blume I.,
Smit E.,
Wessling M.,
Smolders C. A.
Publication year - 1991
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19910450125
Subject(s) - penetrant (biochemical) , polydimethylsiloxane , thermal diffusivity , polymer , materials science , diffusion , membrane , polymer chemistry , gaseous diffusion , permeation , chemical engineering , molecular diffusion , molecule , chemistry , organic chemistry , thermodynamics , nanotechnology , composite material , metric (unit) , biochemistry , physics , operations management , electrode , engineering , economics
Mass transport of a number of organic vapors through polydimethylsiloxane films (PDMS) and carbon dioxide through a variety of polyimides based on a hexafluorotetracarboxylic acid unit (6FDA) were investigated. Vapor diffusion through PDMS films strongly depends on the concentration of the penetrant molecules in the network. For chloroform, increasing diffusivity at lower upstream activities occurs due to network plasticization, while a decreasing diffusion coefficient at larger concentration is supposed to stem from penetrant molecule clustering. The diffusion of carbon dioxide in 6FDA‐based polyimides was modelled on a molecular basis. An exponential relation was found between Δc p and the diffusion coefficient and the permeability, respectively. This relation holds also for on‐chain modifications.