Characterization of Aspen Explosion Pulp by CP/MAS ¹³C NMR

Abstract

Steam explosion pulps were studied by means of CP/MAS 13C NMR spectroscopy. The steam explosion treatment of aspen chips with Na2SO3 and Na2SO3 + NaOH led to a loss in hemicellulose and an increase in cellulose crystallinity. No lignin dissolution occurred during explosion pulping, although the lignin structure might have changed to a certain extent. For comparison purposes, conventional CMP and CTMP pulps were also analyzed. The conventional treatments revealed less modification in the spectrum with regard to original wood samples.

Chemical Characterization and Sorption Capacity Measurements of Degraded Newsprint from a Landfill

“…In the cellulose alcohol region (60-90 ppm) of the 13 C NMR spectra (Figure 2), the couplets at 62 and 65 ppm and 82 and 89 ppm are, respectively, from amorphous and crystalline C-6 and C-4 carbons in cellulose. The relative intensity of crystalline to amorphous peaks for C-4 and C-6 is typically used to determine cellulose crystallinity (35,36). FNP and DNP contained significant crystalline cellulose shown by more intense crystalline C-6 and C-4 peaks at 65 and 89 ppm than amorphous signals at 62 and 82 ppm, respectively.…”