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首页> 外文期刊>RSC Advances >Integrated analysis of solid-state NMR spectra and nuclear magnetic relaxation times for the phenol formaldehyde (PF) resin impregnation process into soft wood
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Integrated analysis of solid-state NMR spectra and nuclear magnetic relaxation times for the phenol formaldehyde (PF) resin impregnation process into soft wood

机译：酚醛醛（PF）树脂浸渍工艺中固态NMR光谱和核磁弛豫时间的综合分析

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摘要

The effects of phenol formaldehyde (PF) resin impregnation into Japanese cedar plates were studied by the integrated analysis of solid-state NMR spectra and relaxation times. C-13 cross-polarization/magic angle spinning (CP-MAS) NMR spectra showed that PF resin permeated near carbohydrate polymers as well as lignin regions, providing hydrophobicity in a woody material. Additionally, C-13 pulse saturation transfer/magic angle spinning (PST-MAS) NMR spectra revealed that the molecular mobility of cellulose endocyclic groups was suppressed by the PF resin impregnation. Spin-lattice relaxation times in the laboratory frame, T1H and T1C, for both untreated and impregnated woods decreased in humid conditions while they were increased by the PF resin impregnation. Meanwhile, spin-lattice relaxation in the rotation frame, T1pH, decreased in humid conditions as well as being a result of the PF resin impregnation. According to the tendencies of the T1H, T1C, and T1pH values associated with the PF resin impregnation, although faster molecular motions of lignin OCH3 group were increased in the MHz frequency range, slower molecular motions of the cellulose ring were suppressed in the kHz frequency range, which confirmed the result from the C-13 PST-MAS NMR spectra.
机译：通过固态NMR光谱和弛豫时间的综合分析研究了酚醛醛（PF）树脂浸渍到日本赤霉板中的影响。 C-13交叉极化/魔法角纺（CP-MAS）NMR光谱显示PF树脂渗透到碳水化合物聚合物附近以及木质素地区，在木质材料中提供疏水性。另外，C-13脉冲饱和传递/魔法角旋转（PST-MAS）NMR光谱显示，通过PF树脂浸渍抑制了纤维素环环基的分子迁移率。在实验室框架中，在实验室框架中旋转晶格弛豫时间，对于未经处理的和浸渍的木材，在潮湿的条件下减少了未处理和浸渍的树木，同时通过PF树脂浸渍增加。同时，自旋 - 晶格弛豫在旋转框架，T1pH，在潮湿条件下减少，以及作为所述酚醛树脂浸渍的结果。根据与PF树脂浸渍相关的T1H，T1C和T1PH值的趋势，尽管在MHz频率范围内增加了木质素OCH3组的分子量，但在KHz频率范围内抑制了纤维素环的较慢的分子动作，这证实了C-13 PST-MAS NMR光谱的结果。

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  • 来源
    《RSC Advances》 |2017年第86期|共10页
  • 作者

    Nishida Masakazu; Tanaka Tomoko; Miki Tsunehisa; Hayakawa Yoshio; Kanayama Kozo;

  • 作者单位

    Natl Inst Adv Ind Sci &

    Technol Moriyama Ku 2266-98 Shimoshidami Nagoya Aichi 4638560 Japan;

    Natl Inst Adv Ind Sci &

    Technol Moriyama Ku 2266-98 Shimoshidami Nagoya Aichi 4638560 Japan;

    Natl Inst Adv Ind Sci &

    Technol Moriyama Ku 2266-98 Shimoshidami Nagoya Aichi 4638560 Japan;

    Natl Inst Adv Ind Sci &

    Technol Moriyama Ku 2266-98 Shimoshidami Nagoya Aichi 4638560 Japan;

    Kyoto Univ Res Inst Sustainable Humanosphere Uji Kyoto 6110011 Japan;

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  • 正文语种 eng
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