Issue 86, 2017, Issue in Progress

Integrated analysis of solid-state NMR spectra and nuclear magnetic relaxation times for the phenol formaldehyde (PF) resin impregnation process into soft wood

Abstract

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, TH, decreased in humid conditions as well as being a result of the PF resin impregnation. According to the tendencies of the T1H, T1C, and TH 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.

Graphical abstract: Integrated analysis of solid-state NMR spectra and nuclear magnetic relaxation times for the phenol formaldehyde (PF) resin impregnation process into soft wood

Supplementary files

Article information

Article type
Paper
Submitted
13 Oct 2017
Accepted
20 Nov 2017
First published
28 Nov 2017
This article is Open Access
Creative Commons BY license

RSC Adv., 2017,7, 54532-54541

Integrated analysis of solid-state NMR spectra and nuclear magnetic relaxation times for the phenol formaldehyde (PF) resin impregnation process into soft wood

M. Nishida, T. Tanaka, T. Miki, Y. Hayakawa and K. Kanayama, RSC Adv., 2017, 7, 54532 DOI: 10.1039/C7RA11295E

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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