Modification of Paulownia Wood with methylolated dimethyloldihydroxyethylenurea (mDMDHEU) and the investigation of its effect on Some of Strength Properties

One of the main strategies to develop the extent of wood modification is using active functional groups in wood structure or the so-called impregnation with modified N-methylol compound. The aim of this study was to evaluate the physical properties of paulownia wood after modify with Polycrease ECR...

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Autores principales:	Mohammad Hadi Rezvani, Aisona Talaei, Hosseinali Rajabi Cham Heidari
Formato:	article
Lenguaje:	FA
Publicado:	Regional Information Center for Science and Technology (RICeST) 2017
Materias:	physical properties Polycrease ECR (mDMDHEU) Cell Wall WPC water absorption bulking efficiency Forestry SD1-669.5
Acceso en línea:	https://doaj.org/article/988f87ab251f478f9d13df5069488c41
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spelling	oai:doaj.org-article:988f87ab251f478f9d13df5069488c412021-12-02T07:45:08ZModification of Paulownia Wood with methylolated dimethyloldihydroxyethylenurea (mDMDHEU) and the investigation of its effect on Some of Strength Properties1735-09132383-112X10.22092/ijwpr.2017.110668.1415https://doaj.org/article/988f87ab251f478f9d13df5069488c412017-10-01T00:00:00Zhttp://ijwpr.areeo.ac.ir/article_112021_1ccaa1d85becba8371f23a81ab123b94.pdfhttps://doaj.org/toc/1735-0913https://doaj.org/toc/2383-112XOne of the main strategies to develop the extent of wood modification is using active functional groups in wood structure or the so-called impregnation with modified N-methylol compound. The aim of this study was to evaluate the physical properties of paulownia wood after modify with Polycrease ECR Cell wall resin, to name modified dimethylol-dihydroxyethyleneurea (mDMDHEU). Physical test samples were prepared according to ASTM and EN standard and treated with pressure vessel method at two concentration levels; 15 and 25 percent of soluble resin. For polymerization, treated samples were heated in oven for 24-hour periods at 145 and 155 ºC respectively. Weight percent gain (WPG), bulking, water soaking, swelling, anti-swelling efficiency (ASE), leaching and contact angle were determined. High mDMDHEU concentration increased the weight gain and cell wall bulking. Highest weight percent gain (10.70%) and bulking efficiency (6.85%) in to levels of 25% were determined at 155 ˚C. In comparison with the unmodified wood, the mDMDHEU modified wood due to absorbed polymer enhancement exhibited improved dimensional stability and reduced water uptake, and maximum dimensional stability were determined in samples modified using to level 25% mDMDHEU containing solutions and curing temperature 155 ºC. Moreover, mDMDHEU treatment was resistant to leaching. Contact angle measurement further confirmed the improved hydrophobicity of wood after modification. Modification with mDMDHEU improved significantly the physical properties. The improve of the resistance of chemically modified wood exposed to can be attributed to the reduction of wood moisture, bulking of cell walls and cell cavities blocking affect to dominant reactivity mDMDHEU with cell wall wood polymer.Mohammad Hadi RezvaniAisona TalaeiHosseinali Rajabi Cham HeidariRegional Information Center for Science and Technology (RICeST)articlephysical propertiesPolycrease ECR (mDMDHEU)Cell Wall WPCwater absorptionbulking efficiencyForestrySD1-669.5FAتحقیقات علوم چوب و کاغذ ایران, Vol 32, Iss 3, Pp 436-449 (2017)
institution	DOAJ
collection	DOAJ
language	FA
topic	physical properties Polycrease ECR (mDMDHEU) Cell Wall WPC water absorption bulking efficiency Forestry SD1-669.5
spellingShingle	physical properties Polycrease ECR (mDMDHEU) Cell Wall WPC water absorption bulking efficiency Forestry SD1-669.5 Mohammad Hadi Rezvani Aisona Talaei Hosseinali Rajabi Cham Heidari Modification of Paulownia Wood with methylolated dimethyloldihydroxyethylenurea (mDMDHEU) and the investigation of its effect on Some of Strength Properties
description	One of the main strategies to develop the extent of wood modification is using active functional groups in wood structure or the so-called impregnation with modified N-methylol compound. The aim of this study was to evaluate the physical properties of paulownia wood after modify with Polycrease ECR Cell wall resin, to name modified dimethylol-dihydroxyethyleneurea (mDMDHEU). Physical test samples were prepared according to ASTM and EN standard and treated with pressure vessel method at two concentration levels; 15 and 25 percent of soluble resin. For polymerization, treated samples were heated in oven for 24-hour periods at 145 and 155 ºC respectively. Weight percent gain (WPG), bulking, water soaking, swelling, anti-swelling efficiency (ASE), leaching and contact angle were determined. High mDMDHEU concentration increased the weight gain and cell wall bulking. Highest weight percent gain (10.70%) and bulking efficiency (6.85%) in to levels of 25% were determined at 155 ˚C. In comparison with the unmodified wood, the mDMDHEU modified wood due to absorbed polymer enhancement exhibited improved dimensional stability and reduced water uptake, and maximum dimensional stability were determined in samples modified using to level 25% mDMDHEU containing solutions and curing temperature 155 ºC. Moreover, mDMDHEU treatment was resistant to leaching. Contact angle measurement further confirmed the improved hydrophobicity of wood after modification. Modification with mDMDHEU improved significantly the physical properties. The improve of the resistance of chemically modified wood exposed to can be attributed to the reduction of wood moisture, bulking of cell walls and cell cavities blocking affect to dominant reactivity mDMDHEU with cell wall wood polymer.
format	article
author	Mohammad Hadi Rezvani Aisona Talaei Hosseinali Rajabi Cham Heidari
author_facet	Mohammad Hadi Rezvani Aisona Talaei Hosseinali Rajabi Cham Heidari
author_sort	Mohammad Hadi Rezvani
title	Modification of Paulownia Wood with methylolated dimethyloldihydroxyethylenurea (mDMDHEU) and the investigation of its effect on Some of Strength Properties
title_short	Modification of Paulownia Wood with methylolated dimethyloldihydroxyethylenurea (mDMDHEU) and the investigation of its effect on Some of Strength Properties
title_full	Modification of Paulownia Wood with methylolated dimethyloldihydroxyethylenurea (mDMDHEU) and the investigation of its effect on Some of Strength Properties
title_fullStr	Modification of Paulownia Wood with methylolated dimethyloldihydroxyethylenurea (mDMDHEU) and the investigation of its effect on Some of Strength Properties
title_full_unstemmed	Modification of Paulownia Wood with methylolated dimethyloldihydroxyethylenurea (mDMDHEU) and the investigation of its effect on Some of Strength Properties
title_sort	modification of paulownia wood with methylolated dimethyloldihydroxyethylenurea (mdmdheu) and the investigation of its effect on some of strength properties
publisher	Regional Information Center for Science and Technology (RICeST)
publishDate	2017
url	https://doaj.org/article/988f87ab251f478f9d13df5069488c41
work_keys_str_mv	AT mohammadhadirezvani modificationofpaulowniawoodwithmethylolateddimethyloldihydroxyethylenureamdmdheuandtheinvestigationofitseffectonsomeofstrengthproperties AT aisonatalaei modificationofpaulowniawoodwithmethylolateddimethyloldihydroxyethylenureamdmdheuandtheinvestigationofitseffectonsomeofstrengthproperties AT hosseinalirajabichamheidari modificationofpaulowniawoodwithmethylolateddimethyloldihydroxyethylenureamdmdheuandtheinvestigationofitseffectonsomeofstrengthproperties
_version_	1718399238135611392

Modification of Paulownia Wood with methylolated dimethyloldihydroxyethylenurea (mDMDHEU) and the investigation of its effect on Some of Strength Properties

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