FTIR,1H-NMR,13C-NMR,31P-NMR and SEM characterization of liquefied triploid clones of Populus tomentosa and Cunninghamia lanceolata by phenol
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摘要: 为搞清酸性条件下三倍体毛白杨和杉木苯酚液化物的结构,该研究对两种木材分别进行了液化处理,并对液化物进行了傅立叶转换红外光谱(FTIR)、核磁共振光谱(1H-NMR、13C-NMR和31P-NMR)以及电子扫描电镜(SEM)的测定分析.FTIR和NMR的分析结果表明,液化后的毛白杨和杉木均发生了结构上的明显变化,出现了纤维素和木素的基本活性结构单元,表明液化处理使木材发生了降解、酚化等化学反应.SEM测定结果表明,木材液化物中含有未完全液化的微小木材组织碎片,两种木材液化物中残存的这种物质的大小存在差异.Abstract: To clarify the variation in chemical components and surface morphology of triploid clones of Populus tomentosa and Cunninghamia lanceolata after liquefaction by phenol,using phosphoric acid as a catalyst,fibers of the two species were liquefied under similar conditions.Both liquefied species were investigated with Fourier Transform Infrared Spectroscopy(FTIR),Nuclear Magnetic Resonance Spectroscopy(NMR),including1H-NMR,13C-NMR and31PNMR spectroscopy,and Scanning Electron Microscope(SEM).The analysis results from FTIR and NMR showed that chemical components of liquefied triploid clones of P.tomentosa and C.lanceolata changed greatly.This produced the basic composition units of cellulose and lignin,and meanwhile resulted in more active organic functional groups.This phenomenon suggested that there were reactions of decomposition and phenolation between wood components and phenol during wood liquefaction.Results of SEM analysis showed that there were still some fine woody fragments of un-liquefied residue in both reactants of triploid clones of P.tomentosa and C.lanceolata.Shape and size of the remaining fragments in liquefied wood of the two species were different.
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Keywords:
- wood liquefaction by phenol /
- FTIR /
- NMR /
- SEM /
- functional group
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