Effect of furfurylation on shear strength of bond line and screw withdrawal resistance of beech and fir

The aim of this study was to investigate the effects of furfurylation on shear strength of bond line and screw withdrawal resistance of beech (Fagus orientalis) and fir (Abies alba) species. In this regard, specimens with two different values of furfurylation i.e. low (fir 14% and beech 20%) and hig...

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Autores principales:	Aysoda Talaei, Mohammad saleh Zare, Hamideh Abdolzadeh
Formato:	article
Lenguaje:	FA
Publicado:	Regional Information Center for Science and Technology (RICeST) 2016
Materias:	Shear strength Bond line furfurylation Screw withdrawal resistance beech fir Forestry SD1-669.5
Acceso en línea:	https://doaj.org/article/71ba828515ba4d1393a6547b4563d370
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spelling	oai:doaj.org-article:71ba828515ba4d1393a6547b4563d3702021-12-02T03:16:05ZEffect of furfurylation on shear strength of bond line and screw withdrawal resistance of beech and fir1735-09132383-112X10.22092/ijwpr.2016.106276https://doaj.org/article/71ba828515ba4d1393a6547b4563d3702016-09-01T00:00:00Zhttp://ijwpr.areeo.ac.ir/article_106276_03d490716dea569fd42b5a2477730adc.pdfhttps://doaj.org/toc/1735-0913https://doaj.org/toc/2383-112XThe aim of this study was to investigate the effects of furfurylation on shear strength of bond line and screw withdrawal resistance of beech (Fagus orientalis) and fir (Abies alba) species. In this regard, specimens with two different values of furfurylation i.e. low (fir 14% and beech 20%) and high (fir 38% and beech 65%) levels were prepared and evaluated in comparison with untreated specimens. The furfurylation was performed after impregnating the specimens by furfuryl alcohol under vacuum condition followed by heating duration to complete polymerization and crosslinking. Specimens were prepared according to standard ASTM D 905 in order to assess shear strength of bond line formed with three different types of adhesives, single-component polyurethane, polyvinyl acetate as well as urea-formaldehyde. Also screw withdrawal resistance of wood polymer specimens was measured perpendicular to grain and parallel to grain. The results indicated that the shear strength of the bond line decreased and screw withdrawal resistance increased by furfurylation level. Examination of adhesion mechanism demonstrated that formation of an appropriate interface between water-soluble adhesives and wood-polymer involves effective penetration of adhesive into cell wall. Hence, the interface of adhesives and material would be the determining factor in developing strength of adhesive joints. Since the wood-furfuryl alcohol is a cell-wall wood-polymer, the possibility of creating an appropriate interface by increasing of furfurylation level was impaired. On the other hand, the adhesion mechanism of polyurethane glue compared to water-soluble adhesives such as polyvinyl acetate and urea-formaldehyde is significantly different, therefore exhibited more strength. The withdrawal screw resistance of furfurylated wood was increased by furfurylation level due to changing nature of wood and increasing shear strength of wood-polymer. This gain was also more evident in fir than beech. The results showed that screw withdrawal resistance perpendicular to grain was higher than parallel to grain.Aysoda TalaeiMohammad saleh ZareHamideh AbdolzadehRegional Information Center for Science and Technology (RICeST)articleShear strengthBond linefurfurylationScrew withdrawal resistancebeechfirForestrySD1-669.5FAتحقیقات علوم چوب و کاغذ ایران, Vol 31, Iss 3, Pp 435-445 (2016)
institution	DOAJ
collection	DOAJ
language	FA
topic	Shear strength Bond line furfurylation Screw withdrawal resistance beech fir Forestry SD1-669.5
spellingShingle	Shear strength Bond line furfurylation Screw withdrawal resistance beech fir Forestry SD1-669.5 Aysoda Talaei Mohammad saleh Zare Hamideh Abdolzadeh Effect of furfurylation on shear strength of bond line and screw withdrawal resistance of beech and fir
description	The aim of this study was to investigate the effects of furfurylation on shear strength of bond line and screw withdrawal resistance of beech (Fagus orientalis) and fir (Abies alba) species. In this regard, specimens with two different values of furfurylation i.e. low (fir 14% and beech 20%) and high (fir 38% and beech 65%) levels were prepared and evaluated in comparison with untreated specimens. The furfurylation was performed after impregnating the specimens by furfuryl alcohol under vacuum condition followed by heating duration to complete polymerization and crosslinking. Specimens were prepared according to standard ASTM D 905 in order to assess shear strength of bond line formed with three different types of adhesives, single-component polyurethane, polyvinyl acetate as well as urea-formaldehyde. Also screw withdrawal resistance of wood polymer specimens was measured perpendicular to grain and parallel to grain. The results indicated that the shear strength of the bond line decreased and screw withdrawal resistance increased by furfurylation level. Examination of adhesion mechanism demonstrated that formation of an appropriate interface between water-soluble adhesives and wood-polymer involves effective penetration of adhesive into cell wall. Hence, the interface of adhesives and material would be the determining factor in developing strength of adhesive joints. Since the wood-furfuryl alcohol is a cell-wall wood-polymer, the possibility of creating an appropriate interface by increasing of furfurylation level was impaired. On the other hand, the adhesion mechanism of polyurethane glue compared to water-soluble adhesives such as polyvinyl acetate and urea-formaldehyde is significantly different, therefore exhibited more strength. The withdrawal screw resistance of furfurylated wood was increased by furfurylation level due to changing nature of wood and increasing shear strength of wood-polymer. This gain was also more evident in fir than beech. The results showed that screw withdrawal resistance perpendicular to grain was higher than parallel to grain.
format	article
author	Aysoda Talaei Mohammad saleh Zare Hamideh Abdolzadeh
author_facet	Aysoda Talaei Mohammad saleh Zare Hamideh Abdolzadeh
author_sort	Aysoda Talaei
title	Effect of furfurylation on shear strength of bond line and screw withdrawal resistance of beech and fir
title_short	Effect of furfurylation on shear strength of bond line and screw withdrawal resistance of beech and fir
title_full	Effect of furfurylation on shear strength of bond line and screw withdrawal resistance of beech and fir
title_fullStr	Effect of furfurylation on shear strength of bond line and screw withdrawal resistance of beech and fir
title_full_unstemmed	Effect of furfurylation on shear strength of bond line and screw withdrawal resistance of beech and fir
title_sort	effect of furfurylation on shear strength of bond line and screw withdrawal resistance of beech and fir
publisher	Regional Information Center for Science and Technology (RICeST)
publishDate	2016
url	https://doaj.org/article/71ba828515ba4d1393a6547b4563d370
work_keys_str_mv	AT aysodatalaei effectoffurfurylationonshearstrengthofbondlineandscrewwithdrawalresistanceofbeechandfir AT mohammadsalehzare effectoffurfurylationonshearstrengthofbondlineandscrewwithdrawalresistanceofbeechandfir AT hamidehabdolzadeh effectoffurfurylationonshearstrengthofbondlineandscrewwithdrawalresistanceofbeechandfir
_version_	1718401862353289216

Effect of furfurylation on shear strength of bond line and screw withdrawal resistance of beech and fir

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