Variable temperature solid-state NMR spectral and relaxation analyses of the impregnation of polyethylene glycol (PEG) into coniferous wood.

ABSTRACT: To investigate the behaviours of polyethylene glycol (PEG) and its interaction with biomass constituents in coniferous wood (Japanese cypress), variable temperature solid-state NMR spectra and relaxation times were measured from 20-80 °C. Signal intensities in the ¹H and ¹³C PST-MAS NMR spectra changed depending on both the measurement temperature and the melting point of the impregnated PEG. In the ¹³C CP-MAS NMR spectra with increasing temperature, although the signal intensities of biomass constituents slightly decreased, signal intensities of PEG molecules in the cypress maximized at 80 °C. PEG impregnation into cypress decreased the T ₁H values at 80 °C for short to medium chain PEG in the liquid phase while it decreased T

SUBMITTER: Nishida M 

PROVIDER: S-EPMC9064324 | biostudies-literature | 2019 May

REPOSITORIES: biostudies-literature