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\n\n \n \n \n \n \n \n Combined treatment of wood with thermosetting resins and phosphorous flame retardants.\n \n \n \n \n\n\n \n Wu, M.; Emmerich, L.; Kurkowiak, K.; and Militz, H.\n\n\n \n\n\n\n
European Journal of Wood and Wood Products, 82(1): 167–174. February 2024.\n
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@article{wu_combined_2024,\n\ttitle = {Combined treatment of wood with thermosetting resins and phosphorous flame retardants},\n\tvolume = {82},\n\tissn = {1436-736X},\n\turl = {https://doi.org/10.1007/s00107-023-02012-8},\n\tdoi = {10.1007/s00107-023-02012-8},\n\tabstract = {Wood modification with thermosetting resins results in improved dimensional stability and durability. However, the treatment does not enhance fire resistance. To address this, Scots pine sapwood (Pinus sylvestris L.) was impregnated with thermosetting resins such as 1,3-dimethylol-4,5-dihydroxyethyleneurea, phenol-formaldehyde resin and melamine-formaldehyde resin, along with a phosphorus polyol as the flame retardant. Both weight percent gain and cell wall bulking were measured to investigate the deposition of resin and phosphorus polyol. Fire resistance was assessed through thermogravimetric analysis, Bunsen burner test and mass loss calorimeter. The inclusion of a phosphate polyol improved thermal stability, reduced flammability and heat release. Melamine-formaldehyde resin combined with phosphorus polyol demonstrated self-extinguishing capability with the heat release rate comparable to non-combustible materials inside 400 s. Moreover, the total heat release within 600 s shows an 84\\% reduction compared to untreated wood.},\n\tlanguage = {en},\n\tnumber = {1},\n\turldate = {2024-01-24},\n\tjournal = {European Journal of Wood and Wood Products},\n\tauthor = {Wu, Muting and Emmerich, Lukas and Kurkowiak, Katarzyna and Militz, Holger},\n\tmonth = feb,\n\tyear = {2024},\n\tpages = {167--174},\n\tfile = {Full Text PDF:/home/becker/Zotero/storage/UKSIKZ9K/Wu et al. - 2024 - Combined treatment of wood with thermosetting resi.pdf:application/pdf},\n}\n\n\n
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\n Wood modification with thermosetting resins results in improved dimensional stability and durability. However, the treatment does not enhance fire resistance. To address this, Scots pine sapwood (Pinus sylvestris L.) was impregnated with thermosetting resins such as 1,3-dimethylol-4,5-dihydroxyethyleneurea, phenol-formaldehyde resin and melamine-formaldehyde resin, along with a phosphorus polyol as the flame retardant. Both weight percent gain and cell wall bulking were measured to investigate the deposition of resin and phosphorus polyol. Fire resistance was assessed through thermogravimetric analysis, Bunsen burner test and mass loss calorimeter. The inclusion of a phosphate polyol improved thermal stability, reduced flammability and heat release. Melamine-formaldehyde resin combined with phosphorus polyol demonstrated self-extinguishing capability with the heat release rate comparable to non-combustible materials inside 400 s. Moreover, the total heat release within 600 s shows an 84% reduction compared to untreated wood.\n
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\n\n \n \n \n \n \n Improving the Fire Performance of Chemically Modified Pine (P. Sylvestris) Sapwood by an Integrated Modification Approach.\n \n \n \n\n\n \n Wu, M.; Emmerich, L.; and Militz, H.\n\n\n \n\n\n\n In Makovická Osvaldová, L.; Hasburgh, L. E.; and Das, O., editor(s),
Wood & Fire Safety 2024, pages 170–177, Cham, 2024. Springer Nature Switzerland\n
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@inproceedings{wu_improving_2024,\n\taddress = {Cham},\n\ttitle = {Improving the {Fire} {Performance} of {Chemically} {Modified} {Pine} ({P}. {Sylvestris}) {Sapwood} by an {Integrated} {Modification} {Approach}},\n\tisbn = {978-3-031-59177-8},\n\tdoi = {10.1007/978-3-031-59177-8_20},\n\tabstract = {Natural wood has been widely used for construction and building purposes. However, wood is susceptible to wood-destroying organisms moisture-induced dimensional changes and fire. Although chemical wood modification technologies with thermosetting resins like phenol-formaldehyde (PF) may compensate durability and swelling issues, the latter may not enhance fire resistance. To address this issue, Scots pine sapwood (Pinus sylvestris L.) has been impregnated with a formulation of a PF resin and a phosphate-nitrogen-based flame retardant. The reaction to fire of the treated material was assessed through thermogravimetry analysis, Bunsen burner test (Pries and Mai), small burner box (ISO 11925–2) and cone calorimeter measurements (ISO 5660–1). Results indicated that pure PF resin treatment slightly improved thermal stability and reduced flame spread. However, it led to a significant increase in heat release peak and smoke production. In contrast, incorporating the flame retardant with PF resin demonstrated notable improvements in fire resistance independent of the test method applied. Compared to pure PF-treated wood, thermogravimetry analysis revealed a 31\\% increase in final char residue. The Bunsen burner test exhibited great self-extinguishing properties and the small burner box test demonstrated a 56\\% reduction in flame height. Cone calorimeter tests confirmed a substantially inhibited heat release with no ignition during the test. Notably, the total smoke production was also significantly reduced, even lower than the untreated wood. These findings emphasize the effectiveness of the combined PF resin and phosphate-nitrogen-based flame retardant treatment in enhancing the fire resistance of wood.},\n\tlanguage = {en},\n\tbooktitle = {Wood \\& {Fire} {Safety} 2024},\n\tpublisher = {Springer Nature Switzerland},\n\tauthor = {Wu, Muting and Emmerich, Lukas and Militz, Holger},\n\teditor = {Makovická Osvaldová, Linda and Hasburgh, Laura E. and Das, Oisik},\n\tyear = {2024},\n\tpages = {170--177},\n}\n\n\n
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\n Natural wood has been widely used for construction and building purposes. However, wood is susceptible to wood-destroying organisms moisture-induced dimensional changes and fire. Although chemical wood modification technologies with thermosetting resins like phenol-formaldehyde (PF) may compensate durability and swelling issues, the latter may not enhance fire resistance. To address this issue, Scots pine sapwood (Pinus sylvestris L.) has been impregnated with a formulation of a PF resin and a phosphate-nitrogen-based flame retardant. The reaction to fire of the treated material was assessed through thermogravimetry analysis, Bunsen burner test (Pries and Mai), small burner box (ISO 11925–2) and cone calorimeter measurements (ISO 5660–1). Results indicated that pure PF resin treatment slightly improved thermal stability and reduced flame spread. However, it led to a significant increase in heat release peak and smoke production. In contrast, incorporating the flame retardant with PF resin demonstrated notable improvements in fire resistance independent of the test method applied. Compared to pure PF-treated wood, thermogravimetry analysis revealed a 31% increase in final char residue. The Bunsen burner test exhibited great self-extinguishing properties and the small burner box test demonstrated a 56% reduction in flame height. Cone calorimeter tests confirmed a substantially inhibited heat release with no ignition during the test. Notably, the total smoke production was also significantly reduced, even lower than the untreated wood. These findings emphasize the effectiveness of the combined PF resin and phosphate-nitrogen-based flame retardant treatment in enhancing the fire resistance of wood.\n
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\n\n \n \n \n \n \n \n Impact of aminosilane and colloidal nano-silica modification on the properties of ambient-cured geopolymer-bonded lignocellulosic composites.\n \n \n \n \n\n\n \n Opara, E. U.; Mayer, A. K.; and Mai, C.\n\n\n \n\n\n\n
Construction and Building Materials, 441: 137554. August 2024.\n
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@article{opara_impact_2024,\n\ttitle = {Impact of aminosilane and colloidal nano-silica modification on the properties of ambient-cured geopolymer-bonded lignocellulosic composites},\n\tvolume = {441},\n\tissn = {09500618},\n\turl = {https://linkinghub.elsevier.com/retrieve/pii/S0950061824026965},\n\tdoi = {10.1016/j.conbuildmat.2024.137554},\n\tabstract = {This study investigates the effect of modifying ambient-cured geopolymer-bonded composites of coir fibre and wood particles with γ-aminopropyltriethoxysilane (APTES, 0.10 wt\\%) and colloidal nano-silica (CNS, 1.45 wt\\%). APTES-modified binders had lower workability (200.7 ± 11.5 mm spread diameter) than unmodified (255.3 ± 12.5 mm) and CNS (248.5 ± 8.9 mm) counterparts. Setting times were similar, with the APTES variant setting faster. CNS-modified binders showed the highest reactivity, reaching peak temperature at 39.5 min. Physicochemical, mechanical, and microstructural analyses were conducted on the composites. CNS-modified composites had the highest internal bond strength (1.52 ± 0.11 N mm− 2), flexural modulus (5416.3 ± 222.8 N mm− 2), flexural strength (10.2 ± 0.7 N mm− 2), and work to maximum force (670.4 ± 23.3 Nmm). APTES-modified composites exhibited superior water resistance, with the lowest water absorption (18.1 ± 0.5 \\%) and thickness swelling (0.10 ± 0.03 \\%) after three 24 h-cycles of water soaking. The pH value remained at 11 over 28 days. Microstructural analysis revealed improved adhesion and reduced voids and cracks in modified composites, which increased performance and water resistance. Coir fibre-reinforced composites exhibited higher strength than those with wood particles. These findings highlight the feasibility of producing ambientcured geopolymer-bonded lignocellulosic composites for building applications.},\n\tlanguage = {en},\n\turldate = {2024-12-09},\n\tjournal = {Construction and Building Materials},\n\tauthor = {Opara, Emmanuel Uchechukwu and Mayer, Aaron Kilian and Mai, Carsten},\n\tmonth = aug,\n\tyear = {2024},\n\tpages = {137554},\n\tfile = {Opara et al. - 2024 - Impact of aminosilane and colloidal nano-silica mo.pdf:/home/becker/Zotero/storage/5YH86H2L/Opara et al. - 2024 - Impact of aminosilane and colloidal nano-silica mo.pdf:application/pdf},\n}\n\n
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\n This study investigates the effect of modifying ambient-cured geopolymer-bonded composites of coir fibre and wood particles with γ-aminopropyltriethoxysilane (APTES, 0.10 wt%) and colloidal nano-silica (CNS, 1.45 wt%). APTES-modified binders had lower workability (200.7 ± 11.5 mm spread diameter) than unmodified (255.3 ± 12.5 mm) and CNS (248.5 ± 8.9 mm) counterparts. Setting times were similar, with the APTES variant setting faster. CNS-modified binders showed the highest reactivity, reaching peak temperature at 39.5 min. Physicochemical, mechanical, and microstructural analyses were conducted on the composites. CNS-modified composites had the highest internal bond strength (1.52 ± 0.11 N mm− 2), flexural modulus (5416.3 ± 222.8 N mm− 2), flexural strength (10.2 ± 0.7 N mm− 2), and work to maximum force (670.4 ± 23.3 Nmm). APTES-modified composites exhibited superior water resistance, with the lowest water absorption (18.1 ± 0.5 %) and thickness swelling (0.10 ± 0.03 %) after three 24 h-cycles of water soaking. The pH value remained at 11 over 28 days. Microstructural analysis revealed improved adhesion and reduced voids and cracks in modified composites, which increased performance and water resistance. Coir fibre-reinforced composites exhibited higher strength than those with wood particles. These findings highlight the feasibility of producing ambientcured geopolymer-bonded lignocellulosic composites for building applications.\n
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