Tannin-based resins modified to reduce wood adhesive brittleness

Citation
Ap. Barbosa et al., Tannin-based resins modified to reduce wood adhesive brittleness, FOREST PROD, 50(9), 2000, pp. 89-92
Citations number
25
Categorie Soggetti
Plant Sciences
Journal title
FOREST PRODUCTS JOURNAL
ISSN journal
00157473 → ACNP
Volume
50
Issue
9
Year of publication
2000
Pages
89 - 92
Database
ISI
SICI code
0015-7473(200009)50:9<89:TRMTRW>2.0.ZU;2-5
Abstract
In South Africa and Brazil, natural tannins extracted from black wattle (Ac acia mearnsii) bark are commercially available as the phenolic adhesive com ponent for bonding wood. This preliminary work deals with the reduction of the brittleness of the tannin-based adhesive joint in such wood materials t hrough the chemical modification of the condensed tannins before reacting w ith formaldehyde. The brittleness reduction was achieved by the introductio n of adipic ester segments between the hydroxyl groups of the compact tanni n macromolecules. The exploratory modified tannin-formaldehyde adhesive was tested for plywood mechanical properties under dry, water, and boil test p rocedures.