EXTRACTIVES FROM BLACKBUTT (EUCALYPTUS-PILULARIS) WOOD WHICH AFFECT GLUEBOND QUALITY OF PHENOLIC RESINS

Blackbutt (Eucalyptus pilularis) is known as a high density and ''diff icult to glue'' wood species, from which hot water extractives were ob tained. The effect of the extractives on gelation of a phenolic resin was determined and was found to vary depending on the amount of the ex tractives added to the phenolic resin. Using authentic hydrolysable ta nnins, particularly ellagitannins isolated from Eucalyptus woods, sepa ration of hydrolysable tannins by high performance liquid chromatograp hy (HPLC) has been achieved by using NWP (acetonitrile-water-phosphori c acid) solvent systems on reversed phase ODS columns. The HPLC analys is of the hot water extractives from blackbutt revealed that the extra ctives consisted of ellagitannins D-1, D-4, D-6, D-13 and three unknow n ellagitannins. Ellagitannin D-13 (28.3%) was found as the major comp onent of the hot water extractives.