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Cellulose

, Volume 26, Issue 6, pp 3625–3642 | Cite as

Integrated analysis of modified Japanese cypress using solid-state NMR spectra and nuclear magnetic relaxation times

  • Masakazu NishidaEmail author
  • Tomoko Tanaka
  • Tsunehisa Miki
  • Yoshio Hayakawa
  • Kozo Kanayama
Original Research
  • 75 Downloads

Abstract

Acetylation and resin impregnation of Japanese cypress and subsequent heating of these modified cypresses were examined using an integrated analysis of solid-state NMR spectra and relaxation times. The 1H magic angle spinning NMR showed altered moisture balance after chemical and thermal modifications because of changed hydrophobicity. The 13C cross-polarization/magic angle spinning (CP-MAS) NMR spectra showed that acetylation predominately occurred for carbohydrates while phenol formaldehyde (PF) and melamine formaldehyde (MF) resins permeated all biomass constituents in cypress samples. Spin–lattice relaxation times in the laboratory frame, T1H and T1C, increased with chemical modifications although T1C decreased with the curing of both resins. In contrast, 1H spin–lattice relaxation in the rotation frame, TH, increased with the curing as well as acetylation. The tendencies of relaxation times with curing suggested that faster molecular motions were suppressed in the MHz frequency range, and slower molecular motions were enhanced in the kHz frequency range, which generally matched with the signal changes in the 13C pulse saturation transfer/magic angle spinning NMR spectra. Scanning electron microscope observation showed different adhesion distribution between PF and MF resins, affecting the cellulose signals of 13C CP-MAS NMR and T1H change due to the curing.

Graphical abstract

Keywords

Acetylation Resin impregnation Curing Relaxation time analysis Biomass constituent Hydrophobicity Molecular mobility Scanning electron microscopy 

Notes

Supplementary material

10570_2019_2330_MOESM1_ESM.pdf (57 kb)
Supplementary material 1 (PDF 56 kb)

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.National Institute of Advanced Industrial Science and Technology (AIST)NagoyaJapan
  2. 2.Research Institute for Sustainable HumanosphereKyoto UniversityGokanosho, UjiJapan

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