| Title: | Significance of wood extractives for wood bonding |
| Address: | "Georg-August-University Gottingen, Busgenweg 1, 37077, Gottingen, Germany. eroffae1@gwdg.de" |
| Journal Title: | Appl Microbiol Biotechnol |
| DOI: | 10.1007/s00253-015-7207-8 |
| ISSN/ISBN: | 1432-0614 (Electronic) 0175-7598 (Linking) |
| Abstract: | "Wood contains primary extractives, which are present in all woods, and secondary extractives, which are confined in certain wood species. Extractives in wood play a major role in wood-bonding processes, as they can contribute to or determine the bonding relevant properties of wood such as acidity and wettability. Therefore, extractives play an immanent role in bonding of wood chips and wood fibres with common synthetic adhesives such as urea-formaldehyde-resins (UF-resins) and phenol-formaldehyde-resins (PF-resins). Extractives of high acidity accelerate the curing of acid curing UF-resins and decelerate bonding with alkaline hardening PF-resins. Water-soluble extractives like free sugars are detrimental for bonding of wood with cement. Polyphenolic extractives (tannins) can be used as a binder in the wood-based industry. Additionally, extractives in wood can react with formaldehyde and reduce the formaldehyde emission of wood-based panels. Moreover, some wood extractives are volatile organic compounds (VOC) and insofar also relevant to the emission of VOC from wood and wood-based panels" |
| Keywords: | Adhesives/*metabolism Complex Mixtures/*metabolism Volatile Organic Compounds/*metabolism Wood/*chemistry Formaldehyde emission Primary extractives Secondary extractives Tannins Wood bonding Wood extractives Wood-based panels; |
| Notes: | "MedlineRoffael, Edmone eng Review Germany 2015/12/22 Appl Microbiol Biotechnol. 2016 Feb; 100(4):1589-1596. doi: 10.1007/s00253-015-7207-8. Epub 2015 Dec 19" |
