苯酚甲醛（PF）树脂浸渍到软木中的固态NMR光谱和核磁弛豫时间的综合分析<a href="#fn1" title="提供电子补充信息（ESI）。参见DOI：10.1039 / c7ra11295e">†</a>,RSC Advances

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苯酚甲醛（PF）树脂浸渍到软木中的固态NMR光谱和核磁弛豫时间的综合分析 †
RSC Advances ( IF 3.9 ) Pub Date : 2017-11-28 00:00:00 , DOI: 10.1039/c7ra11295e
Masakazu Nishida _{1,

2,

3} , Tomoko Tanaka _{1,

2,

3} , Tsunehisa Miki _{1,

2,

3} , Yoshio Hayakawa _{1,

2,

3} , Kozo Kanayama _{4,

5,

6,

7}

Affiliation

通过对固态NMR光谱和弛豫时间的综合分析，研究了酚醛树脂（PF）树脂浸渍到日本雪松板中的影响。¹³ C交叉极化/魔角旋转（CP-MAS）NMR光谱显示，PF树脂渗透到碳水化合物聚合物以及木质素区域附近，从而在木质材料中提供疏水性。此外，¹³ C脉冲饱和转移/魔角旋转（PST-MAS）NMR光谱表明，PF树脂浸渍可抑制纤维素内环基团的分子迁移率。在实验室框架中自旋晶格弛豫时间T ₁ H和T ₁C，对于未经处理和经浸渍的木材，在潮湿条件下均会降低，而通过PF树脂的浸渍会使其升高。同时，在上述旋转框自旋-晶格弛豫，Ť _1ρ H，在潮湿条件下减少，以及作为所述酚醛树脂浸渍的结果。根据的倾向Ť ₁ H，Ť ₁ C，和Ť _1ρ ħ值与PF树脂浸渍相关联，虽然木质素OCH更快分子运动₃组在MHz频率范围内均增加，纤维素环的更慢的分子运动在kHz频率范围内被抑制，这证实了¹³ C PST-MAS NMR谱的结果。

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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†

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. ¹³C 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, ¹³C 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, T_1ρH, decreased in humid conditions as well as being a result of the PF resin impregnation. According to the tendencies of the T₁H, T₁C, and T_1ρH 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 ¹³C PST-MAS NMR spectra.

更新日期：2017-11-28

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