Water absorption of phenolic varnish films

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Journal titleJournal of the Oil & Colour Chemists' Association
Pages10151025; # of pages: 11
Subjectphenolic varnish; water absorption; relative humidity; durability; water absorption; phenolic varnish; Buildings
AbstractAccurate values for the amount of water absorbed by unpigmented oil-phenolic varnishes are only obtained when the films are subjected to at least five absorption- desorption cycles. Solvent trapped in the film is gradually released and the absorption values become constant. The varnishes studied do not show hysteresis in their isothermal sorption curves. It is expected that similar types of material will exhibit the same behaviour. The complete stepwise procedure does not, therefore, appear necessary in characterising the absorption properties of clear varnishes. Adequate information is obtained with several successive exposures to zero and 99 per cent RH. Rapid- drying materials require one or two more cycles to remove trapped solvent. The values thus obtained with paraphenylphenolic varnishes are related to their exterior durability on wood.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number11701
NPARC number20374864
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Record identifier17f38b4a-061b-4cbe-86d3-0c4db4dca863
Record created2012-07-23
Record modified2016-05-09
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