Effects of eliagic acid and derivatives thereof on water repellency and dimensional stability
2008
Przewloka, S. R. | Shearer, B. J.
Derivatives of the insoluble polyphenol ellagic acid and water soluble tetraguanidinium, tetracholine, tetrakis-benzyltrimethylammonium and tetrakis-tetramethylammonium eIlagates and 2,3,4,2',3',4'-hexamethoxy-6,6'-diisocyanato-diphenyl, were prepared. The effects of these compounds upon water repellency and dimensional stability when impregnated into timber were examined. Water soluble ellagates improved water repellent effectiveness up to 32%. Ellagic acid and 2,3,4,2',3',4'hexamethoxy-6,6'-diisocyanato-diphenyl increased initial swelling rates due to their solvent carriers. All trial compounds provided the timber wafers with additional dimensional stability predominantly by non-bonded, non-leachable bulking. Generally a reduction in the extent but not the rate of moisture uptake was noted for the compounds investigated.
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