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SEM Analysis of Glued Joints of Thermally Modified Wood Bonded with PUR and PVAc Glues
This study deals with the scanning electron microscopy (SEM) analyses of the phase interfaces in the glued joints between Norway spruce wood elements thermally modified at 160, 180, 200, and 220 °C/4 h and polyurethane (PUR) and polyvinyl acetate (PVAc) glues with the aim of evaluating various anato...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9503839/ https://www.ncbi.nlm.nih.gov/pubmed/36143752 http://dx.doi.org/10.3390/ma15186440 |
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author | Mamoňová, Miroslava Ciglian, Dávid Reinprecht, Ladislav |
author_facet | Mamoňová, Miroslava Ciglian, Dávid Reinprecht, Ladislav |
author_sort | Mamoňová, Miroslava |
collection | PubMed |
description | This study deals with the scanning electron microscopy (SEM) analyses of the phase interfaces in the glued joints between Norway spruce wood elements thermally modified at 160, 180, 200, and 220 °C/4 h and polyurethane (PUR) and polyvinyl acetate (PVAc) glues with the aim of evaluating various anatomical influences of wood on the quality of joints. Due to cracked regions created in the surface of spruce wood at severe thermal modifications, the penetration depth of glues doubled from 140 to 241 μm for PUR glue, and from 100 to 200 μm for PVAc glue. The thickness of glue lines in joints was apparently higher for PVAc glue, mainly in earlywood regions; however, in joints from thermally modified (TM) woods it increased more apparently for PUR glue from 16.6 to 44.4 μm, probably in connection with formation of micro-bubbles in its structure. The SEM analyses corresponded well with the previous knowledge about lower shear strength of glued joints formed from the more intensively TM spruce elements and mentioned types of glues. |
format | Online Article Text |
id | pubmed-9503839 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-95038392022-09-24 SEM Analysis of Glued Joints of Thermally Modified Wood Bonded with PUR and PVAc Glues Mamoňová, Miroslava Ciglian, Dávid Reinprecht, Ladislav Materials (Basel) Article This study deals with the scanning electron microscopy (SEM) analyses of the phase interfaces in the glued joints between Norway spruce wood elements thermally modified at 160, 180, 200, and 220 °C/4 h and polyurethane (PUR) and polyvinyl acetate (PVAc) glues with the aim of evaluating various anatomical influences of wood on the quality of joints. Due to cracked regions created in the surface of spruce wood at severe thermal modifications, the penetration depth of glues doubled from 140 to 241 μm for PUR glue, and from 100 to 200 μm for PVAc glue. The thickness of glue lines in joints was apparently higher for PVAc glue, mainly in earlywood regions; however, in joints from thermally modified (TM) woods it increased more apparently for PUR glue from 16.6 to 44.4 μm, probably in connection with formation of micro-bubbles in its structure. The SEM analyses corresponded well with the previous knowledge about lower shear strength of glued joints formed from the more intensively TM spruce elements and mentioned types of glues. MDPI 2022-09-16 /pmc/articles/PMC9503839/ /pubmed/36143752 http://dx.doi.org/10.3390/ma15186440 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Mamoňová, Miroslava Ciglian, Dávid Reinprecht, Ladislav SEM Analysis of Glued Joints of Thermally Modified Wood Bonded with PUR and PVAc Glues |
title | SEM Analysis of Glued Joints of Thermally Modified Wood Bonded with PUR and PVAc Glues |
title_full | SEM Analysis of Glued Joints of Thermally Modified Wood Bonded with PUR and PVAc Glues |
title_fullStr | SEM Analysis of Glued Joints of Thermally Modified Wood Bonded with PUR and PVAc Glues |
title_full_unstemmed | SEM Analysis of Glued Joints of Thermally Modified Wood Bonded with PUR and PVAc Glues |
title_short | SEM Analysis of Glued Joints of Thermally Modified Wood Bonded with PUR and PVAc Glues |
title_sort | sem analysis of glued joints of thermally modified wood bonded with pur and pvac glues |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9503839/ https://www.ncbi.nlm.nih.gov/pubmed/36143752 http://dx.doi.org/10.3390/ma15186440 |
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