Modification of beech veneers with lignin phenol formaldehyde resins in the production of laminated veneer lumber (LVL). Fleckenstein, M., Biziks, V., Mai, C., & Militz, H. European Journal of Wood and Wood Products, 76(3):843–851, May, 2018.
Modification of beech veneers with lignin phenol formaldehyde resins in the production of laminated veneer lumber (LVL) [link]Paper  doi  abstract   bibtex   1 download  
Rotary cut beech (Fagus sylvatica L.) veneers were treated with four different lignin phenol formaldehyde (LPF) solutions using dimethyl sulfoxide (DMSO) as a solvent. Four of these veneers were bonded with PF adhesive to produce four-layer laminated veneer lumber (LVL). To synthesize the LPF solutions, a commercial phenol formaldehyde resin (PF resin) was individually mixed with three different technical lignins (Indulin AT, BioChoice lignin, organosolv lignin) and lignin cleavage products (LCP) at a ratio of 3:2 (60%:40%). Differential scanning calorimetry showed an increased curing temperature for the LPF resins in comparison to the PF resin. The mechanical and water-related properties of the LPF-modified LVL were shown to be similar or slightly improved compared to PF-modified LVL. Fungal degradation experiments with white-rot fungus (Trametes versicolor) and brown-rot fungus (Coniophora puteana) exhibited no significant differences in the mass loss of the LPF-modified and PF-modified samples except in one case: LVL made from veneers treated with Indulin AT exposed to the white-rot fungus. The resistance to weathering of LVL samples made from veneers treated with technical lignins was low; however, specimens treated with LCP and the reference PF resin displayed a higher resistance to weathering. It is concluded that technical lignins or LCP can, to a certain extent, be used as a substitute for crude-oil based PF resin.
@article{fleckenstein_modification_2018,
	title = {Modification of beech veneers with lignin phenol formaldehyde resins in the production of laminated veneer lumber ({LVL})},
	volume = {76},
	issn = {1436-736X},
	url = {https://doi.org/10.1007/s00107-017-1275-7},
	doi = {10.1007/s00107-017-1275-7},
	abstract = {Rotary cut beech (Fagus sylvatica L.) veneers were treated with four different lignin phenol formaldehyde (LPF) solutions using dimethyl sulfoxide (DMSO) as a solvent. Four of these veneers were bonded with PF adhesive to produce four-layer laminated veneer lumber (LVL). To synthesize the LPF solutions, a commercial phenol formaldehyde resin (PF resin) was individually mixed with three different technical lignins (Indulin AT, BioChoice lignin, organosolv lignin) and lignin cleavage products (LCP) at a ratio of 3:2 (60\%:40\%). Differential scanning calorimetry showed an increased curing temperature for the LPF resins in comparison to the PF resin. The mechanical and water-related properties of the LPF-modified LVL were shown to be similar or slightly improved compared to PF-modified LVL. Fungal degradation experiments with white-rot fungus (Trametes versicolor) and brown-rot fungus (Coniophora puteana) exhibited no significant differences in the mass loss of the LPF-modified and PF-modified samples except in one case: LVL made from veneers treated with Indulin AT exposed to the white-rot fungus. The resistance to weathering of LVL samples made from veneers treated with technical lignins was low; however, specimens treated with LCP and the reference PF resin displayed a higher resistance to weathering. It is concluded that technical lignins or LCP can, to a certain extent, be used as a substitute for crude-oil based PF resin.},
	language = {en},
	number = {3},
	urldate = {2020-01-17},
	journal = {European Journal of Wood and Wood Products},
	author = {Fleckenstein, Marco and Biziks, Vladimirs and Mai, Carsten and Militz, Holger},
	month = may,
	year = {2018},
	pages = {843--851},
	file = {Fleckenstein (2017) Modification of beech veneers with lignin phenol formaldehyde resins in the production of laminated veneer lumber (LVL).pdf:C\:\\Users\\Eva\\Zotero\\storage\\GXNGVI3Q\\Fleckenstein (2017) Modification of beech veneers with lignin phenol formaldehyde resins in the production of laminated veneer lumber (LVL).pdf:application/pdf},
}

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