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The effect of ageing on bonding performance of plasma treated beech wood with urea-formaldehyde adhesive
ID Žigon, Jure (Author), ID Saražin, Jaša (Author), ID Šernek, Milan (Author), ID Kovač, Janez (Author), ID Dahle, Sebastian (Author)

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Abstract
In the process of wood bonding, the usage of aged and inactivated wooden elements can cause a reduction in mechanical properties of products containing wood-adhesive joints. Treating wood with an atmospheric air plasma represents a sophisticated technique for surface activation. With this regard, to enhance the bondability of normal beech wood (Fagus sylvatica L.) with urea-formaldehyde (UF) adhesive, a dielectric barrier discharge plasma in floating electrode configuration was implemented. In this study, fresh and aged wood specimen both, untreated and plasma treated, were investigated. X-ray photoelectron spectroscopy revealed promotion of carbon-rich species with ageing, but generation of a new functional oxygen-containing functional groups after plasma treatment. Microscopic observations with scanning electron microscope showed no obvious changes in the wood structure after plasma treatment. Surface oxidation consequently improved the wettability of the wood surface with water and UF adhesive. However, this enhanced wettability slightly diminished over time. As shown with dynamic mechanical analysis, the rheological properties of the UF adhesive in wood-adhesive joints were not affected by aging nor by plasma treatment. The positive influence of plasma treatment and negative impact of substrate ageing to the shear strengths of wood lap-joints were determined using an automated bonding evaluation system. Similarly, the negative effect of wood ageing and the positive effect of plasma pre-treatment were reflected in the bending strengths of the produced laminated veneer lumbers. Results showed that plasma treatment of beech wood improves the bonding performance of both fresh and aged wood.

Language:English
Keywords:ageing, bonding, wood, plasma, urea-formaldehyde adhesive, surface
Work type:Article (dk_c)
Typology:1.01 - Original Scientific Article
Organization:BF - Biotechnical Faculty
Year:2021
Publication status in journal:Published
Article version:Publisher's version of article
Publication date:01.01.2021
Number of pages:Str. 2461-2478
Numbering:Vol. 28
PID:20.500.12556/RUL-138724 This link opens in a new window
UDC:630*8
ISSN on article:1572-882X
DOI:10.1007/s10570-021-03687-z This link opens in a new window
COBISS.SI-ID:49872899 This link opens in a new window
Publication date in RUL:10.08.2022
Views:50
Downloads:23
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Record is a part of a journal

Title:Cellulose
Shortened title:Cellulose
Publisher:Kluwer
ISSN:1572-882X
COBISS.SI-ID:513134105 This link opens in a new window

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

Language:Slovenian
Keywords:staranje, lepljenje, les, plazma, urea-formaldehidno lepilo, površina

Projects

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Project number:P4-0015
Name:Les in lignocelulozni kompoziti

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Project number:P2-0082
Name:Tankoplastne strukture in plazemsko inženirstvo površin

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