Abstract
By means of selective reduction and controlled hydrolysis combined with cation exchange, it is possible to itemize the carboxyls of hardwood and softwood in three categories, as free, restricted, and bound. The picture firts the recognition, supported by earlier experimental evidence of a cache of exchange sites which are involved according to the testing procedure. Although in chemical terms acidity is very weak, it still drives the processes because of localized delivery.
Zusammenfassung
Durch selektive Reduktion und kontrollierte Hydrolyse in Kombination mit Kationenaustausch ist es möglich, drei Kategorien von Carboxylgruppen in Laub- und Nadelholz zu unterscheiden: freie, behinderte und gebundene. Diese Ergebnisse stützen frühere, auf zahlreichen Untersuchungen beruhende Erkenntnisse, daß die Säuregruppen des Holzes sich wie (sterisch) behinderte Austauschergruppen verhalten, deren Zugänglichkeit von den angewandten Methoden abhängt. Obwohl die Gesamtacidität sehr gering ist, können säureabhängige Prozesse lokal stark beeinflußt werden.
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Matteoli, U., Menchi, G., Staccioli, G. et al. Acid groups structure in wood as shown using selective reduction. Holz als Roh-und Werkstoff 50, 438–440 (1992). https://doi.org/10.1007/BF02662782
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DOI: https://doi.org/10.1007/BF02662782