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

Volume 47, Number 10 (Oct. 1993) Page 1693-1695

Hua, X.; Capretti, G.; Focher, B.; Marzetti, A.; Kokta, B.V.; Kaliaguine, S.


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.