Making wheat straw particleboards by using mixture of MF and UF resins

For making wheat straw particleboards, different mixtures of UF and MF resins were used. The ratio of UF : MF was 0:100,75:25,50:50,25:75 and 100:0 based on weight of resin and boards densities were set to 0.7 . The physical and mechanical properties such as Thickness Swelling(TS)(after 2 and 24 hou...

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Main Authors:	Mohamad Tasoji, Taghi Tabrsa, Alireza Mohammadi
Format:	article
Language:	FA
Published:	Regional Information Center for Science and Technology (RICeST) 2010
Subjects:	wheat straw particleboard Urea formaldehyde resin Melamine formaldehyde resin waxy layer Forestry SD1-669.5
Online Access:	https://doaj.org/article/136b222ef264465c8a786f1bf3b7558a
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id	oai:doaj.org-article:136b222ef264465c8a786f1bf3b7558a
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spelling	oai:doaj.org-article:136b222ef264465c8a786f1bf3b7558a2021-12-02T04:35:15ZMaking wheat straw particleboards by using mixture of MF and UF resins1735-09132383-112X10.22092/ijwpr.2010.117315https://doaj.org/article/136b222ef264465c8a786f1bf3b7558a2010-09-01T00:00:00Zhttp://ijwpr.areeo.ac.ir/article_117315_783e3ffed9c869981ad7eed943ad2f9e.pdfhttps://doaj.org/toc/1735-0913https://doaj.org/toc/2383-112XFor making wheat straw particleboards, different mixtures of UF and MF resins were used. The ratio of UF : MF was 0:100,75:25,50:50,25:75 and 100:0 based on weight of resin and boards densities were set to 0.7 . The physical and mechanical properties such as Thickness Swelling(TS)(after 2 and 24 hours), Internal Bonding(IB) , Modulus Of Elasticity(MOE) ,Modulus Of Rupture(MOR) were determined and compared to EN 312-4 standard. The highest amounts of IB ,MOR and MOE are from the boards that were made from 50:50 (UF:MF) . All of The boards MOE and MOR amounts of all treatments except treatment 100:0 (UF:MF) were in range of EN 312-4 standard but the IB amounts were not. The TS amount was improved in the boards with more MF content but it was not in EN 312-4 range. Due to the thin waxy layer that covers the outer most layer of wheat straw surface, the non polar structure of this layer brings incompatibility between polar resins and wheat straw particles and this incompatibility will result in low physical and mechanical property for wheat straw particleboards. Also due to low porosity of waxy layer, the distribution of formaldehyde polar resins on straw particles surface, not well occur and this itself is an important factor in decrease of physical and mechanical resistance in wheat straw particleboards.Mohamad TasojiTaghi TabrsaAlireza MohammadiRegional Information Center for Science and Technology (RICeST)articlewheat straw particleboardUrea formaldehyde resinMelamine formaldehyde resinwaxy layerForestrySD1-669.5FAتحقیقات علوم چوب و کاغذ ایران, Vol 25, Iss 2, Pp 291-301 (2010)
institution	DOAJ
collection	DOAJ
language	FA
topic	wheat straw particleboard Urea formaldehyde resin Melamine formaldehyde resin waxy layer Forestry SD1-669.5
spellingShingle	wheat straw particleboard Urea formaldehyde resin Melamine formaldehyde resin waxy layer Forestry SD1-669.5 Mohamad Tasoji Taghi Tabrsa Alireza Mohammadi Making wheat straw particleboards by using mixture of MF and UF resins
description	For making wheat straw particleboards, different mixtures of UF and MF resins were used. The ratio of UF : MF was 0:100,75:25,50:50,25:75 and 100:0 based on weight of resin and boards densities were set to 0.7 . The physical and mechanical properties such as Thickness Swelling(TS)(after 2 and 24 hours), Internal Bonding(IB) , Modulus Of Elasticity(MOE) ,Modulus Of Rupture(MOR) were determined and compared to EN 312-4 standard. The highest amounts of IB ,MOR and MOE are from the boards that were made from 50:50 (UF:MF) . All of The boards MOE and MOR amounts of all treatments except treatment 100:0 (UF:MF) were in range of EN 312-4 standard but the IB amounts were not. The TS amount was improved in the boards with more MF content but it was not in EN 312-4 range. Due to the thin waxy layer that covers the outer most layer of wheat straw surface, the non polar structure of this layer brings incompatibility between polar resins and wheat straw particles and this incompatibility will result in low physical and mechanical property for wheat straw particleboards. Also due to low porosity of waxy layer, the distribution of formaldehyde polar resins on straw particles surface, not well occur and this itself is an important factor in decrease of physical and mechanical resistance in wheat straw particleboards.
format	article
author	Mohamad Tasoji Taghi Tabrsa Alireza Mohammadi
author_facet	Mohamad Tasoji Taghi Tabrsa Alireza Mohammadi
author_sort	Mohamad Tasoji
title	Making wheat straw particleboards by using mixture of MF and UF resins
title_short	Making wheat straw particleboards by using mixture of MF and UF resins
title_full	Making wheat straw particleboards by using mixture of MF and UF resins
title_fullStr	Making wheat straw particleboards by using mixture of MF and UF resins
title_full_unstemmed	Making wheat straw particleboards by using mixture of MF and UF resins
title_sort	making wheat straw particleboards by using mixture of mf and uf resins
publisher	Regional Information Center for Science and Technology (RICeST)
publishDate	2010
url	https://doaj.org/article/136b222ef264465c8a786f1bf3b7558a
work_keys_str_mv	AT mohamadtasoji makingwheatstrawparticleboardsbyusingmixtureofmfandufresins AT taghitabrsa makingwheatstrawparticleboardsbyusingmixtureofmfandufresins AT alirezamohammadi makingwheatstrawparticleboardsbyusingmixtureofmfandufresins
_version_	1718401111425024000

Making wheat straw particleboards by using mixture of MF and UF resins

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