SUGAR-LIGNOCELLULOSIC COMPOSITES: THE INCORPORATION OF TWO SIMPLE SACCHARIDES INTO MOULDING AS ADDITIVES

Wood veneer of pine (Pinus radiata D. Don) and eucalyptus (Eucaliptus globulus ssp. globulus Labill) were analyzed by means of Dynamic Mechanical Analysis (DMA). Previously, they were saturated with buffer phosphate (pH=4), fructose and maltose (2%) solutions. The viscoelastic behavior and temperatu...

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Autores principales:	Moya Villablanca,Cristian, Reyes Velásquez,Nazmy
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2003
Materias:	DMA sugars pine eucalyptus MOR
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072003000400009
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spelling	oai:scielo:S0717-970720030004000092004-04-26SUGAR-LIGNOCELLULOSIC COMPOSITES: THE INCORPORATION OF TWO SIMPLE SACCHARIDES INTO MOULDING AS ADDITIVESMoya Villablanca,CristianReyes Velásquez,Nazmy DMA sugars pine eucalyptus MOR Wood veneer of pine (Pinus radiata D. Don) and eucalyptus (Eucaliptus globulus ssp. globulus Labill) were analyzed by means of Dynamic Mechanical Analysis (DMA). Previously, they were saturated with buffer phosphate (pH=4), fructose and maltose (2%) solutions. The viscoelastic behavior and temperatures of relaxation of wood in both species were differents, the effect was attributed to its chemical difference. This behavior is changed in both species by sugars presence generating plasticizing effects, being more marked in presence of maltose than fructose. Between species, the pine wood presents the most important changes of its viscoelastic properties. With this information, molding samples from both species, made with mixture of particles (0.25 mm) of bark (49%), wood (49%) and sugars 2%, were obtained using pressure and temperature controlled. They were essayed for determinate the internal bond considering the Modulus of rupture (MOR). According to Multiple Linear Regression Analyses (MLR), with a 95% of confidence, the variation of the MOR is explained in 68% of the cases by the particular specie, wood and bark, moisture content, time of impregnating and type of sugar. The large values of the MOR are produced by a greater amount of hydroxyls groups contributed by maltose producing the greater plasticizing effect and the greater union between particled lignocellulosic materials. The minor water content generated the greater MOR, this is attributed to its plastizicing effect, it means that dependency of the water content under the saturation point of the fiber is not directly proportional to the plastizicing effectinfo:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.48 n.4 20032003-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072003000400009en10.4067/S0717-97072003000400009
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	DMA sugars pine eucalyptus MOR
spellingShingle	DMA sugars pine eucalyptus MOR Moya Villablanca,Cristian Reyes Velásquez,Nazmy SUGAR-LIGNOCELLULOSIC COMPOSITES: THE INCORPORATION OF TWO SIMPLE SACCHARIDES INTO MOULDING AS ADDITIVES
description	Wood veneer of pine (Pinus radiata D. Don) and eucalyptus (Eucaliptus globulus ssp. globulus Labill) were analyzed by means of Dynamic Mechanical Analysis (DMA). Previously, they were saturated with buffer phosphate (pH=4), fructose and maltose (2%) solutions. The viscoelastic behavior and temperatures of relaxation of wood in both species were differents, the effect was attributed to its chemical difference. This behavior is changed in both species by sugars presence generating plasticizing effects, being more marked in presence of maltose than fructose. Between species, the pine wood presents the most important changes of its viscoelastic properties. With this information, molding samples from both species, made with mixture of particles (0.25 mm) of bark (49%), wood (49%) and sugars 2%, were obtained using pressure and temperature controlled. They were essayed for determinate the internal bond considering the Modulus of rupture (MOR). According to Multiple Linear Regression Analyses (MLR), with a 95% of confidence, the variation of the MOR is explained in 68% of the cases by the particular specie, wood and bark, moisture content, time of impregnating and type of sugar. The large values of the MOR are produced by a greater amount of hydroxyls groups contributed by maltose producing the greater plasticizing effect and the greater union between particled lignocellulosic materials. The minor water content generated the greater MOR, this is attributed to its plastizicing effect, it means that dependency of the water content under the saturation point of the fiber is not directly proportional to the plastizicing effect
author	Moya Villablanca,Cristian Reyes Velásquez,Nazmy
author_facet	Moya Villablanca,Cristian Reyes Velásquez,Nazmy
author_sort	Moya Villablanca,Cristian
title	SUGAR-LIGNOCELLULOSIC COMPOSITES: THE INCORPORATION OF TWO SIMPLE SACCHARIDES INTO MOULDING AS ADDITIVES
title_short	SUGAR-LIGNOCELLULOSIC COMPOSITES: THE INCORPORATION OF TWO SIMPLE SACCHARIDES INTO MOULDING AS ADDITIVES
title_full	SUGAR-LIGNOCELLULOSIC COMPOSITES: THE INCORPORATION OF TWO SIMPLE SACCHARIDES INTO MOULDING AS ADDITIVES
title_fullStr	SUGAR-LIGNOCELLULOSIC COMPOSITES: THE INCORPORATION OF TWO SIMPLE SACCHARIDES INTO MOULDING AS ADDITIVES
title_full_unstemmed	SUGAR-LIGNOCELLULOSIC COMPOSITES: THE INCORPORATION OF TWO SIMPLE SACCHARIDES INTO MOULDING AS ADDITIVES
title_sort	sugar-lignocellulosic composites: the incorporation of two simple saccharides into moulding as additives
publisher	Sociedad Chilena de Química
publishDate	2003
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072003000400009
work_keys_str_mv	AT moyavillablancacristian sugarlignocellulosiccompositestheincorporationoftwosimplesaccharidesintomouldingasadditives AT reyesvelasqueznazmy sugarlignocellulosiccompositestheincorporationoftwosimplesaccharidesintomouldingasadditives
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SUGAR-LIGNOCELLULOSIC COMPOSITES: THE INCORPORATION OF TWO SIMPLE SACCHARIDES INTO MOULDING AS ADDITIVES

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