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CHEMICAL CHANGES INDUCED IN PINUS RADIATA AND EUCALYPTUS NITENS FOLLOWING THE DENSIFICATION PROCESS

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dc.creatorROMINA CONZUELO CHÁVEZ FRIZ
dc.creatorCECILIA DEL CARMEN BUSTOS ÁVILA
dc.date2015
dc.date.accessioned2025-01-10T14:33:57Z
dc.date.available2025-01-10T14:33:57Z
dc.date.issued2015
dc.description.abstractDENSIFICATION OF WOOD LEADS TO IMPROVEMENT OF ITS MECHANICAL PROPERTIES. SPECIMENS OF PINUS RADIATA AND EUCALYPTUS NITENS WOOD WERE DENSIFIED USING HEAT, STEAM, AND PRESSURE TO IMPROVE THEIR MECHANICAL PROPERTIES AND THUS ENHANCE THEIR UTILIZATION. AT A MAXIMUM STEAM PRESSURE OF 550 KPA AND A MAXIMUM PRESS HYDRAULIC PRESSURE RANGING FROM 4.5 TO 9 MPA, SELECTED TEMPERATURES OF 160°C, 180°C, AND 200°C WERE USED TO CHECK THE MECHANICAL PROPERTIES AND TO IDENTIFY THE CHEMICAL COMPOSITION OF WOOD SAMPLES BEFORE AND AFTER DENSIFICA-TION. DENSIFIED WOOD SAMPLES SHOWED MARKEDLY REDUCED HYGROSCOPICITY. THE CHEMICAL CHANGES IN THE WOOD CONSTITUENTS OCCURRING DURING DENSIFICATION WERE CHARACTERIZED USING FT-IR, PY-GC/MS, AND XPS. ACCORDING TO THE DENSIFICATION PROCESS BETWEEN PINE AND EUCALYPTUS, THE RESULTS OBTAINED SHOWED THAT THE DENSIFICATION EFFECTS WERE BETTER FOR EUCALYPTUS NITENS THAN FOR PINUS RADIATA. THE FT-IR ANALYSIS REVEALED A HIGH CONDENSATION INDEX FOR PINE LIGNIN AND THE LOW CONDENSATION INDEX FOR EUCALYPTUS LIGNIN, INDICATING EASIER FORMATION OF CC LINKAGES BY DENSIFICATION IN PINE LIGNIN. PY-GC/MS ANALYSES WERE PERFORMED TO FOLLOW THE LIGNIN/CARBOHYDRATE RATIO, AND THESE REVEALED MAJOR CARBOHYDRATE LOSSES DURING DENSIFICATION AT THE HIGHEST TEMPERATURE.
dc.formatapplication/pdf
dc.identifier.issn1927-632X
dc.identifier.issn1927-6311
dc.identifier.urihttps://repositorio.ubiobio.cl/handle/123456789/7983
dc.languagespa
dc.publisherJ-FOR-Journal of Science & Technology for Forest Products and Processes
dc.rightsPUBLICADA
dc.titleCHEMICAL CHANGES INDUCED IN PINUS RADIATA AND EUCALYPTUS NITENS FOLLOWING THE DENSIFICATION PROCESS
dc.typeARTÍCULO
dspace.entity.typePublication
ubb.EstadoPUBLICADA
ubb.Otra ReparticionDEPARTAMENTO DE INGENIERIA EN MADERAS
ubb.SedeCONCEPCIÓN
ubb.SedeCONCEPCIÓN
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