利用核磁共振技术研究热处理中密度纤维板的吸水性
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摘要
基于时域核磁共振技术,对3个热处理温度(120、170和220℃)下MDF(中密度纤维板)的吸水性进行了研究,并利用X射线衍射技术,辅助揭示不同样品吸水性差异的机理。结果表明,170℃处理MDF吸水过程中吸水率、自由水和结合水含量最低;220℃热处理MDF的纤维素结晶区被破坏,原有的空隙结构被改变,吸水率、自由水和结合水含量最高。
In this study, water absorption of MDF(medium density fiberboard) treated with high temperatures(120℃, 170℃ and 220℃) was studied using the time-domain nuclear magnetic resonance technique. The x-ray diffraction technique was used to reveal the effect mechanism of heat-treatment on the water absorption, and the results showed that the contents of free water and bound water of MDF treated at 170 ℃were the lowest, which meant 170 was the ideal heat℃-temperature in this experiment. In addition, the crystal and pore structures of MDF treated at 220 were changed, and their contents of free water and bound water were the highest.
In this study, water absorption of MDF(medium density fiberboard) treated with high temperatures(120℃, 170℃ and 220℃) was studied using the time-domain nuclear magnetic resonance technique. The x-ray diffraction technique was used to reveal the effect mechanism of heat-treatment on the water absorption, and the results showed that the contents of free water and bound water of MDF treated at 170 ℃were the lowest, which meant 170 was the ideal heat℃-temperature in this experiment. In addition, the crystal and pore structures of MDF treated at 220 were changed, and their contents of free water and bound water were the highest.
引文
[1]欧阳靓,曹金珍,朱愿.中密度纤维板的尺寸稳定性改良技术[J].林产工业, 2013, 40(4):12-16.
[2]韩书广,那斌,崔举庆.等温热处理对中纤板物理力学性能的影响[J].东北林业大学学报, 2013, 41(6):104-108.
[3]GARCIARA,CLOUTIERA,RIEDLB.Dimensional stabilityofMDFpanelsproducedfromheat-treatedfibres[J]. Holzforschung, 2006, 60(3):278-284.
[4]?AVDARAD,ERTA?M,KALAYCIO?LUH,etal.Some properties of thin medium density fiberboard panels treated with sunflower waste oil vapor[J]. Mater Design,2010, 31(5):2561-2567.
[5]BONIGUTJ,KRUGD,STEPHANIB.Propertiesof thermallymodifiedmedium-densityfibreboards[J].Holzforschung, 2012, 66(1):79-83.
[6]周方赟,陈博文,苗平.核磁共振技术在分析木材微波干燥过程中水分移动的应用[J].安徽农业大学学报,2015, 42(1):45-49.
[7]KEKKONEN P M, YLISASSI A, TELKKI V V. Absorption of water in thermally modified pine wood as studied by nuclear magnetic resonance[J]. J Phys Chem C, 2014,118(4):2146-2153.
[8]JAVED M A, KEKKONEN P M, AHOLA S, et al. Magneticresonanceimagingstudyofwaterabsorptionin thermallymodifiedpinewood[J].Holzforschung,2015,69(7):899-907.
[9]国家林业局.人造板及饰面人造板理化性能试验方法:GB/T 17657-2013[S].北京:中国标准出版社,2013.
[10]李贤军,刘元,高建民,等.高温热处理木材的FTIR和XRD分析[J].北京林业大学学报,2009,31(增刊1):104-107.
[11]ARAUJOCD,MACKAYAL,HAILEYJRT,etal.Proton magnetic resonance techniques for characterization ofwaterinwood:applicationtowhitespruce[J].Wood Sci Technol, 1992, 26(2):101-113.
[12]ARAUJO C D, MACKAY A L, WHITTALL K P, et al. A diffusionmodelforspin-spinrelaxationofcompartmentalized water in wood[J]. J Magn Reson, 1993, 101(3):248-261.
[13]MENON R S, MACKAY A L, FLIBOTTE S, et al. QuantitativeseparationofNMRimagesofwaterinwoodon the basis of T2[J]. J Magn Reson,1989,82(1):205-210.
[14]JIANGXG,LICY,CHIY,etal.TG-FTIRstudyon urea-formaldehyderesinresidueduringpyrolysisand combustion[J]. J Hazard Mater, 2010, 173(1):205-210.
[15]邓邵平,杨文斌,饶久平,等.热处理对人工林杉木尺寸稳定性的影响[J].中国农学通报,2009, 25(7):103-108.
[2]韩书广,那斌,崔举庆.等温热处理对中纤板物理力学性能的影响[J].东北林业大学学报, 2013, 41(6):104-108.
[3]GARCIARA,CLOUTIERA,RIEDLB.Dimensional stabilityofMDFpanelsproducedfromheat-treatedfibres[J]. Holzforschung, 2006, 60(3):278-284.
[4]?AVDARAD,ERTA?M,KALAYCIO?LUH,etal.Some properties of thin medium density fiberboard panels treated with sunflower waste oil vapor[J]. Mater Design,2010, 31(5):2561-2567.
[5]BONIGUTJ,KRUGD,STEPHANIB.Propertiesof thermallymodifiedmedium-densityfibreboards[J].Holzforschung, 2012, 66(1):79-83.
[6]周方赟,陈博文,苗平.核磁共振技术在分析木材微波干燥过程中水分移动的应用[J].安徽农业大学学报,2015, 42(1):45-49.
[7]KEKKONEN P M, YLISASSI A, TELKKI V V. Absorption of water in thermally modified pine wood as studied by nuclear magnetic resonance[J]. J Phys Chem C, 2014,118(4):2146-2153.
[8]JAVED M A, KEKKONEN P M, AHOLA S, et al. Magneticresonanceimagingstudyofwaterabsorptionin thermallymodifiedpinewood[J].Holzforschung,2015,69(7):899-907.
[9]国家林业局.人造板及饰面人造板理化性能试验方法:GB/T 17657-2013[S].北京:中国标准出版社,2013.
[10]李贤军,刘元,高建民,等.高温热处理木材的FTIR和XRD分析[J].北京林业大学学报,2009,31(增刊1):104-107.
[11]ARAUJOCD,MACKAYAL,HAILEYJRT,etal.Proton magnetic resonance techniques for characterization ofwaterinwood:applicationtowhitespruce[J].Wood Sci Technol, 1992, 26(2):101-113.
[12]ARAUJO C D, MACKAY A L, WHITTALL K P, et al. A diffusionmodelforspin-spinrelaxationofcompartmentalized water in wood[J]. J Magn Reson, 1993, 101(3):248-261.
[13]MENON R S, MACKAY A L, FLIBOTTE S, et al. QuantitativeseparationofNMRimagesofwaterinwoodon the basis of T2[J]. J Magn Reson,1989,82(1):205-210.
[14]JIANGXG,LICY,CHIY,etal.TG-FTIRstudyon urea-formaldehyderesinresidueduringpyrolysisand combustion[J]. J Hazard Mater, 2010, 173(1):205-210.
[15]邓邵平,杨文斌,饶久平,等.热处理对人工林杉木尺寸稳定性的影响[J].中国农学通报,2009, 25(7):103-108.