Wood adhesives derived from alkaline extracts of maritime Pine bark: preparation, physical characteristics and bonding efficacy
authors Jorge, FC; Neto, CP; Irle, MA; Gil, MH; de Jesus, JP
nationality International
journal HOLZ ALS ROH-UND WERKSTOFF
keywords PINASTER BARK; PARTICLEBOARD
abstract An alkaline extract of maritime pine (Pinus pinaster) was investigated for its solubility in water or aqueous NaOH, for its stability when stored in the form of a solution in 5% NaOH, and for the physical properties and bondability of formulations prepared by incorporation of tannins into a PF resin. The extract is poorly soluble even in aqueous NaOH and its reactivity towards formaldehyde increases with time when it is stored in the form of an alkaline solution. The incorporation of a solution of tannins made with 5% NaOH into PF resin did not affect adversely the physical properties of the resin. But also just the extract in 5% NaOH solution, when heated at 175 degreesC, develops strength comparable to the PF resin, as experienced with impregnated paper strips. Furthermore, these formulations develop bonds to wood and even a solution of just tannins presented a 100%-wood failure with the majority of the replicate samples, after bond strength tests.
publisher SPRINGER-VERLAG
issn 0018-3768
year published 2002
volume 60
issue 4
beginning page 303
ending page 310
digital object identifier (doi) 10.1007/s00107-002-0302-4
web of science category Materials Science, Paper & Wood
subject category Materials Science
unique article identifier WOS:000177939600012
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