The swelling of wood in polar organic solvents

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Journal titleWood Science
Pages159166; # of pages: 8
Subjectwood (species); swelling; polar solvents; Buildings
AbstractThe effectiveness of dimethyl sulfoxide, dimethylformamide, N-methyl pyrrolidone, and pyridine in swelling yellow birch, beech, white pine, and Douglas-fir was determined. Changes in the radial and tangential dimensions during simple immersion were followed until maximum swelling was obtained. The complete swelling behavior in cases of rapid swelling was found to be described by the hyperbolic formula: swelling at time t = equilibrium swelling -- b/time. b is the swelling resistance coefficient. For slower swelling, in the initial period the swelling is directly proportional to time, not to its square root. Birch was swollen the most by solvents, and pine the least, in relation to their densities. Beach and pine swelled the fastest, while Douglas-fir was most resistant. Dimethyl sulfoxide caused the greatest final swelling, but dimethylformamide swelled wood more rapidly. The latter solvent could be used with simple immersion, except with fir. To swell wood effectively with dimethyl sulfoxide would require a vacuum impregnation process.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number13742
NPARC number20374788
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Record identifiera4973a54-7f52-498b-8c91-1d9920aa4e06
Record created2012-07-23
Record modified2016-05-09
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