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Determination of diffusion rates in swelling systems
Author(s) -
Watt I. C.
Publication year - 1964
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.1964.070080628
Subject(s) - swelling , diffusion , keratin , desorption , permeation , absorption (acoustics) , sorption , absorption of water , chemistry , thermal diffusivity , alcohol , materials science , polymer chemistry , polymer , chemical engineering , chromatography , thermodynamics , analytical chemistry (journal) , organic chemistry , composite material , adsorption , biochemistry , medicine , physics , pathology , membrane , engineering
A new method of measuring diffusion coefficients of ethyl alcohol in keratin is described. Ethyl alcohol, which is retained in keratin on desorption by evacuation, is released by swelling the keratin with water vapor. The essential measurement is the loss of weight of the keratin as the ethyl alcohol diffuses out after the absorption of water. Values of the diffusion coefficients at 35°C. are given for a range of volume swelling of keratin where it is not possible to obtain the data by absorption or permeation measurements. The change of diffusion coefficient with swelling is in agreement with values obtained by absorption at lower and higher levels of swelling. The method should have general applicability to many polymer sorption systems where swelling occurs.