Tannin Cellulose - Lignin Book by K. Freudenberg
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Tannin Cellulose - Lignin

Tannin Cellulose - Lignin


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About the Book

2 1 wahrend im Vergleich hierzu in der Cellulose ein praktisch unbegrenztes Molekiil vorliegt; den zahlreichen Variationen der Bindung im Tannin steht dagegen bei der Cellulose die Einheitlichkeit der Bindung gegeniiber. Das Lignin vereinigt in sich, wie ausfiihrlich dargetan wird, die methodischen und begrifflichen Schwierigkeiten des Tannins und der Cellulose. Mit dem Tannin hat es die Verschiedenheit der Bausteine und die groBe Zahl der Bindungsarten gemeinsam. Die Bausteine sind beim Tannin Glucose und Gallussaure, zwei Anteile, deren experimentelle Unterscheidung keine Miihe bereitet. Beim Lignin stehen sich die Bausteine ebenso nahe wie etwa Vanillin, Isovanillin und Piperonal; ihre Unterscheidung ist erschwert. Obendrein kann die Stelle des Benzolkerns variieren, an der ein Baustein mit dem nachten kondensiert, und zwar irre- versibel kondensiert ist. Mit der Cellulose hat das Lignin gemeinsam die fiir die iibliche Methodik unbegrenzte GroBe des "Molekiils", die obendrein in weitesten Grenzen schwanken diirfte. Hier wird die von E. FISCHER verlangte Abgrenzung der Gruppeneigenschaften noch lange unsicher bleiben, und der Forschung wird noch manche Anstrengung auferlegt sein, urn mit fortschreitender Methodik die Grenzen immer scharfer abzustecken. Dagegen ist hier von einer anderen Seite her ein Fortschritt zu erhoffen. Die Aufgabe, das Lignin aufzuklaren, laBt sich mit der Frage nach der Konstitution eines fertigen Bakelitpraparates ver- gleichen. FUr dieses wird man schwerlich einen Formelausdruck sich vorstellen und noch weniger ihn yom fertigen Kondensat aus ermitteln konnen.


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Product Details
  • ISBN-13: 9783642471650
  • Publisher: Springer-Verlag Berlin and Heidelberg GmbH & Co. KG
  • Binding: Paperback
  • Height: 244 mm
  • No of Pages: 165
  • Series Title: German
  • Weight: 331 gr
  • ISBN-10: 364247165X
  • Publisher Date: 01 Jan 1933
  • Edition: Softcover Reprint of the Origi ed.
  • Language: German
  • Returnable: N
  • Spine Width: 9 mm
  • Width: 170 mm


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