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Publications (10 of 31) Show all publications
Scharf, A., Švajger, Č., Lin, C.-F., Humar, M., Sandberg, D. & Jones, D. (2024). Effect of fire-retardant treatment of wood prior to thermo-mechanical densification. Wood Material Science & Engineering, 19(3), 1-4
Open this publication in new window or tab >>Effect of fire-retardant treatment of wood prior to thermo-mechanical densification
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2024 (English)In: Wood Material Science & Engineering, ISSN 1748-0272, E-ISSN 1748-0280, Vol. 19, no 3, p. 1-4Article in journal (Refereed) Epub ahead of print
Abstract [en]

Wood densification itself does not, in general, improve the fire-retardant properties sufficiently to reach the standard requirements. The object of this study was to enhance the fire-retardant properties of thermo-mechanically densified wood without any loss of moisture stability and hardness. Scots pine sapwood was pretreated before densification by impregnation with a fire retardant (FR) consisting of ammonium dihydrogen phosphate and urea and then cured in-situ by hot pressing at 150 °C or 210 °C. Densified specimens without FR were used as a control. Set-recovery, fire retardancy in an open flame test, and Brinell hardness were determined. The set-recovery was slightly reduced as a result of the FR treatment, but the pressing temperature and time had a much greater influence. In the open flame test, specimens without FR-treated ignited within 15-50s of exposure to the flame, whereas all the FR-treated specimens exhibited ignition resistance over the 10 minutes duration of the test. Water-soaking cycles had no impact on the ignition resistance in these groups, indicating a strong resistance to water leaching of FR after pressing at 210 °C for 60 minutes. The hardness increased due to the presence of FR after pressing at 210 °C, but sharply decreased after water immersion.

Place, publisher, year, edition, pages
Taylor & Francis, 2024
Keywords
Wood compression, open flame, urea, ammonium dihydrogen phosphate
National Category
Wood Science
Research subject
Wood Science and Engineering
Identifiers
urn:nbn:se:ltu:diva-104919 (URN)10.1080/17480272.2024.2329734 (DOI)
Note

Full text license: CC BY-NC-ND

Available from: 2024-03-28 Created: 2024-03-28 Last updated: 2024-04-05
Lin, C.-F., Karlsson, O., Jones, D. & Sandberg, D. (2024). Kraft lignin-glyoxal, phase-change material modified wood for enhancing thermal-energy storage capability. Wood Material Science & Engineering
Open this publication in new window or tab >>Kraft lignin-glyoxal, phase-change material modified wood for enhancing thermal-energy storage capability
2024 (English)In: Wood Material Science & Engineering, ISSN 1748-0272, E-ISSN 1748-0280Article in journal (Refereed) Epub ahead of print
Abstract [en]

The rise in energy consumption and the increase in the use of bio-based materials in the building sector, has led to the need to investigate the possibilities to use wood as a porous support material for phase change materials (PCMs), and thereby creating a thermal regulative wood-based product. This study investigated the influence of Kraft lignin-glyoxal prepolymer on the thermal-energy storage properties of wood modified with paraffin-type of PCM. The implementation of the modified wood involves preparing PCM emulsions, synthesising lignin-glyoxal prepolymer, and modifying wood with the PCM-Kraft lignin-glyoxal emulsion through vacuum-pressure impregnation. The infrared imaging suggested the ability of PCM-modified wood to delay the temperature changes, even with the introduction of Kraft lignin-glyoxal prepolymer. In conclusion, it is feasible to introduce thermal-energy storage property into wood with the addition of Kraft lignin-glyoxal prepolymer. Further studies will focus on the long-term thermal storage performance properties when this PCM system is subjected to repeated heating/cooling cycles. 

Place, publisher, year, edition, pages
Taylor & Francis, 2024
Keywords
Encapsulation, paraffin, thermal-regulated wood
National Category
Wood Science
Research subject
Wood Science and Engineering
Identifiers
urn:nbn:se:ltu:diva-105332 (URN)10.1080/17480272.2024.2344050 (DOI)
Funder
Swedish Research Council FormasLuleå University of Technology, CT WOOD; SUN
Note

Full text: CC BY-NC-ND License

Available from: 2024-05-03 Created: 2024-05-03 Last updated: 2024-05-06
Karlsson, O. & Lin, C.-F. (2024). The analysis of long-time-exposed tars from wood shingles from church roofs and facades in mid-Sweden. Wood Material Science & Engineering
Open this publication in new window or tab >>The analysis of long-time-exposed tars from wood shingles from church roofs and facades in mid-Sweden
2024 (English)In: Wood Material Science & Engineering, ISSN 1748-0272, E-ISSN 1748-0280Article in journal (Refereed) Epub ahead of print
Abstract [en]

Poor condition of roofs in terms of decay of shingles and loss of tar-based surface treatments has been revealed in a number of churches at various geographical locations in mid-Sweden. The condition of tars obtained from shingles of selected churches in mid-Sweden were analysed and obtained data were compared with geographical locations of the churches. According to gas chromatography-mass spectroscopy result, dehydroabietic acid was the dominant compound found in the exposed tars from the churches except in church of Malung where similar amounts of retene was found. Oxidised resin acids were found in exposed tars from the churches but not in commercially available pit burned tar. Tar from church shingles had higher char residues than the pit burned tar which was totally consumed when heated under nitrogen gas up to 750°C using thermogravimetric analysis. Scanning electron microscopy with energy dispersive X-ray spectrometer analysis revealed higher amounts of silicates in some exposed tars; however, these compounds constituted only a minor portion of the organic matter in these specimens. Based on the data obtained in the study other factors rather than simply geographical location of churches seemed to be of importance to explain differences of the investigated properties of the church tars.

Place, publisher, year, edition, pages
Taylor & Francis, 2024
Keywords
GC-MS, Resin acids, SEM-EDX, TGA
National Category
Wood Science
Research subject
Wood Science and Engineering
Identifiers
urn:nbn:se:ltu:diva-104861 (URN)10.1080/17480272.2024.2311169 (DOI)2-s2.0-85188097692 (Scopus ID)
Projects
Biobasedfire protection of wood panel for exterior conditions by using phosphorylated lignin from wheat straw
Funder
Swedish Research Council Formas, 2021-00818
Note

Funder: CT WOOD, Luleå University of Technology;

Full text license: CC BY 4.0

Available from: 2024-03-25 Created: 2024-03-25 Last updated: 2024-03-25
Sarvašová Kvietková, M., Dvořák, O., Kalábová, M., Šimůnková, K., Štěrbová, I., Pastierovič, F., . . . Jones, D. (2024). The Influence of the Type of Coating on Thermally Modified Wood and the Resulting Durability of the Surface Treatment on a Facade. Journal of Building Engineering, Article ID 109629.
Open this publication in new window or tab >>The Influence of the Type of Coating on Thermally Modified Wood and the Resulting Durability of the Surface Treatment on a Facade
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2024 (English)In: Journal of Building Engineering, E-ISSN 2352-7102, article id 109629Article in journal (Refereed) In press
Place, publisher, year, edition, pages
Elsevier, 2024
National Category
Wood Science
Research subject
Wood Science and Engineering
Identifiers
urn:nbn:se:ltu:diva-105507 (URN)10.1016/j.jobe.2024.109629 (DOI)
Available from: 2024-05-17 Created: 2024-05-17 Last updated: 2024-05-17
Lin, C.-F., Myronycheva, O., Karlsson, O., Jones, D. & Sandberg, D. (2023). A new wood-modification process based on grafted urethane groups: Durability of carbamated Scots pine (Pinus sylvestris L.) wood.. In: C. Crestini; H. Lange; M. Gigli; M. Sgarzi (Ed.), 21st ISWFPC Conference Proceedings: Vol. II Poster presentations. Paper presented at 21st International Symposium on Wood, Fiber and Pulping Chemistry (ISWFPC 2023), Venice, Italy, June 4–7, 2023 (pp. 78-81). Ca’ Foscari University of Venice, Department of Molecular Sciences and Nanosystems,, 2
Open this publication in new window or tab >>A new wood-modification process based on grafted urethane groups: Durability of carbamated Scots pine (Pinus sylvestris L.) wood.
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2023 (English)In: 21st ISWFPC Conference Proceedings: Vol. II Poster presentations / [ed] C. Crestini; H. Lange; M. Gigli; M. Sgarzi, Ca’ Foscari University of Venice, Department of Molecular Sciences and Nanosystems, , 2023, Vol. 2, p. 78-81Conference paper, Poster (with or without abstract) (Refereed)
Place, publisher, year, edition, pages
Ca’ Foscari University of Venice, Department of Molecular Sciences and Nanosystems,, 2023
National Category
Wood Science
Research subject
Wood Science and Engineering
Identifiers
urn:nbn:se:ltu:diva-103166 (URN)
Conference
21st International Symposium on Wood, Fiber and Pulping Chemistry (ISWFPC 2023), Venice, Italy, June 4–7, 2023
Projects
Advanced research supporting the forestry and wood-processing sector’s adaptation to global change and the 4th industrial revolutionBiobased fire protection of wood panel for exterior conditions by using phosphorylated lignin from wheat straw
Funder
Swedish Research Council Formas, 2021-00818
Note

Funder: OP RDE (CZ.02.1.01/0.0/0.0/16_019/0000803); CT WOOD; Swedish wood industry

ISBN for host publication: 9788831461580

Available from: 2023-12-01 Created: 2023-12-01 Last updated: 2023-12-21Bibliographically approved
Lin, C.-f., Myronycheva, O., Karlsson, O., Mantanis, G. I., Jones, D. & Sandberg, D. (2023). A new wood-modification process based on in situ grafting of urethane groups: biological resistance and dimensional stability of carbamylated Scots pine wood. Wood Material Science & Engineering, 18(3), 1160-1162
Open this publication in new window or tab >>A new wood-modification process based on in situ grafting of urethane groups: biological resistance and dimensional stability of carbamylated Scots pine wood
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2023 (English)In: Wood Material Science & Engineering, ISSN 1748-0272, E-ISSN 1748-0280, Vol. 18, no 3, p. 1160-1162Article in journal (Refereed) Published
Abstract [en]

Chemical modification of wood typically requires the impregnation of wood with reactive compounds capable of undergoing covalent bonding to functional groups present in the cell wall. Creating such reactive agents in situ, with the use of low-priced chemicals, would prove more attractive for commercial applications. In this study, Scots pine (Pinus sylvestris L.) sapwood was impregnated with an aqueous solution of urea (30%), dried at 40°C for 24 h, and subsequently heat treated in an oven at 150°C for 24 h to produce the reactive isocyanic acid. By using accelerated fungal tests under laboratory conditions, provisional tests demonstrated a high biological resistance against selected moulds and rots. Migration of urea into the wood structure and grafting to its polymers during subsequent heat treatment, led to a bulked cell wall and enhanced resistance to water swelling, even after cycling water treatments. The bending strength (MOR) of modified pine wood was reduced by the treatment applied, while its modulus of elasticity (MOE) remained unchanged.

Place, publisher, year, edition, pages
Taylor & Francis, 2023
Keywords
Biological durability, distortion, sawn timber, thermal modified timber, Wood protection
National Category
Wood Science Composite Science and Engineering
Research subject
Wood Science and Engineering
Identifiers
urn:nbn:se:ltu:diva-97268 (URN)10.1080/17480272.2023.2207541 (DOI)000991623500001 ()2-s2.0-85159810327 (Scopus ID)
Projects
Biobased fire protection of wood panel for exterior conditions by using phosphorylated lignin from wheat straw
Funder
Luleå University of Technology, CT-WOODSwedish Research CouncilSwedish Research Council Formas, 2021-00818
Note

Validerad;2023;Nivå 2;2023-06-30 (joosat);

Licens fulltext: CC BY-NC-ND License

Available from: 2023-05-22 Created: 2023-05-22 Last updated: 2023-06-30Bibliographically approved
Lin, C.-F., Scharf, A., Karlsson, O., Sandberg, D. & Jones, D. (2023). Biobased adesive derived from citric acid and sorbitrol for wood-composite manufacture.. In: Morwenna Spear, Simon Curling, Athanasious Dimitriou, Rob Elias, Ceri Loxton (Ed.), Proceedings of the International Panel Production Symposium 2023: . Paper presented at International Panel Production Symposium 2023 (IPPS23), Llandudno, Wales, United Kingdom, October 3-4, 2023 (pp. 183-187). The BioComposite Centre, Bangor University, UK
Open this publication in new window or tab >>Biobased adesive derived from citric acid and sorbitrol for wood-composite manufacture.
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2023 (English)In: Proceedings of the International Panel Production Symposium 2023 / [ed] Morwenna Spear, Simon Curling, Athanasious Dimitriou, Rob Elias, Ceri Loxton, The BioComposite Centre, Bangor University, UK , 2023, p. 183-187Conference paper, Oral presentation with published abstract (Refereed)
Place, publisher, year, edition, pages
The BioComposite Centre, Bangor University, UK, 2023
National Category
Wood Science
Research subject
Wood Science and Engineering
Identifiers
urn:nbn:se:ltu:diva-103637 (URN)
Conference
International Panel Production Symposium 2023 (IPPS23), Llandudno, Wales, United Kingdom, October 3-4, 2023
Funder
Swedish Research Council Formas, 2021-00818
Note

Funder: OP RDE (CZ.02.1.01/0.0/0.0/16_019/0000803), CT WOOD

ISBN for host publication: 978-1-84220-200-5

Available from: 2024-01-14 Created: 2024-01-14 Last updated: 2024-03-23Bibliographically approved
Lin, C.-F., Scharf, A., Karlsson, O., Sandberg, D. & Jones, D. (2023). Fire-retardant phosphorus-containing silica gel modified particleboard. In: Morwenna Spear, Simon Curling, Athanasious Dimitriou, Rob Elias, Ceri Loxton (Ed.), Proceedings of International Panel Production Symposium 2023: . Paper presented at International Panel Production Symposium 2023, (IPPS23), Llandudno, Wales, United Kingdom, October 3-4, 2023 (pp. 177-182). The BioComposite Centre, Bangor University, UK
Open this publication in new window or tab >>Fire-retardant phosphorus-containing silica gel modified particleboard
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2023 (English)In: Proceedings of International Panel Production Symposium 2023 / [ed] Morwenna Spear, Simon Curling, Athanasious Dimitriou, Rob Elias, Ceri Loxton, The BioComposite Centre, Bangor University, UK , 2023, p. 177-182Conference paper, Oral presentation with published abstract (Refereed)
Place, publisher, year, edition, pages
The BioComposite Centre, Bangor University, UK, 2023
National Category
Wood Science
Research subject
Wood Science and Engineering
Identifiers
urn:nbn:se:ltu:diva-103636 (URN)
Conference
International Panel Production Symposium 2023, (IPPS23), Llandudno, Wales, United Kingdom, October 3-4, 2023
Funder
Swedish Research Council Formas, 2021-00818
Note

Funder: Slovak Research and Development Agency (APVV-16-0223); VEGA (VEGA 1/0678/22); KEGA (KEGA 016STU4/2021); OP RDE (CZ.02.1.01/0.0/0.0/16_019/0000803); CT WOOD

ISBN for host publication: 978-1-84220-200-5

Available from: 2024-01-14 Created: 2024-01-14 Last updated: 2024-01-15Bibliographically approved
Das, O., Mensah, R. A., Balasubramanian, K. B., Shanmugam, V., Försth, M., Hedenqvist, M. S., . . . Misra, M. (2023). Functionalised biochar in biocomposites: The effect of fire retardants, bioplastics and processing methods. Composites Part C: Open Access, 11, Article ID 100368.
Open this publication in new window or tab >>Functionalised biochar in biocomposites: The effect of fire retardants, bioplastics and processing methods
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2023 (English)In: Composites Part C: Open Access, E-ISSN 2666-6820, Vol. 11, article id 100368Article in journal (Refereed) Published
Abstract [en]

Fire retardants, although can impart fire-safety in polymeric composites, are detrimental to the mechanical properties. Biochar can be used, in conjunction with fire retardants, to create a balance between fire-safety and mechanical performance. It is possible to thermally dope fire retardants into the pores of biochar to make it functionalised. Thus, the current work is intended in identifying a composite having the combination of the most desirable fire retardant, bioplastic, and a suitable processing method. A comparison was made between two fire retardants (lanosol and ammonium polyphosphate), bioplastics (wheat gluten and polyamide 11), and composite processing methods (compression and injection moulding). It was found that wheat gluten containing ammonium polyphosphate-doped biochar made by compression moulding had the best fire-safety properties with the lowest peak heat release rate (186 kW/m2), the highest fire performance index (0.6 m2s/kW), and the lowest fire growth index (1.6 kW/ms) with acceptable mechanical properties compared to the corresponding neat bioplastic. Thus, for gluten-based polymers, the use of ammonium polyphosphate thermally doped into biochar processed by compression moulding is recommended to both simultaneously improve fire-safety and conserve the mechanical strength of the resulting biocomposites.

Place, publisher, year, edition, pages
Elsevier, 2023
Keywords
Biochar, Bioplastics, Compression moulding, Fire retardants, Injection moulding
National Category
Materials Chemistry Paper, Pulp and Fiber Technology
Research subject
Structural Engineering; Wood Science and Engineering
Identifiers
urn:nbn:se:ltu:diva-98229 (URN)10.1016/j.jcomc.2023.100368 (DOI)001016720900001 ()2-s2.0-85160716623 (Scopus ID)
Funder
Brandforsk, 321–002
Note

Validerad;2023;Nivå 2;2023-06-13 (hanlid)

Available from: 2023-06-13 Created: 2023-06-13 Last updated: 2024-03-07Bibliographically approved
Myronycheva, O., Björngrim, N., Lin, C.-F., Karlsson, O., Sandberg, D., Zalar, P. & Gunde-Cimerman, N. (2023). Fungus from a historical timber bridge in northern Sweden. In: Polona Zalar; Cene Gostinčar (Ed.), IUBMB Focused Meeting On Extremophilic Fungi: Abstract Book, Ljubljana, Slovenia, 19-22 September, 2023. Paper presented at IUBMB Focused Meeting on Extremophilic Fungi (FUN-EX), Ljubljana, Slovenia, 19-22 September, 2023 (pp. 134). University of Ljubljana, Biotechnical Faculty, Article ID P9.8.
Open this publication in new window or tab >>Fungus from a historical timber bridge in northern Sweden
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2023 (English)In: IUBMB Focused Meeting On Extremophilic Fungi: Abstract Book, Ljubljana, Slovenia, 19-22 September, 2023 / [ed] Polona Zalar; Cene Gostinčar, University of Ljubljana, Biotechnical Faculty , 2023, p. 134-, article id P9.8Conference paper, Poster (with or without abstract) (Refereed)
Place, publisher, year, edition, pages
University of Ljubljana, Biotechnical Faculty, 2023
National Category
Wood Science
Research subject
Wood Science and Engineering
Identifiers
urn:nbn:se:ltu:diva-103462 (URN)
Conference
IUBMB Focused Meeting on Extremophilic Fungi (FUN-EX), Ljubljana, Slovenia, 19-22 September, 2023
Funder
Swedish National Heritage Board, 2022-2403Luleå University of Technology
Note

Funder: CT WOOD;

ISBN for host publication: 978-961-6379-82-3

Available from: 2024-01-03 Created: 2024-01-03 Last updated: 2024-01-30Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-0852-5066

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