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DIFFERENT TYPES OF PHENOLIC UNITS IN LIGNINS

Knut Lundquist (Institutionen för kemi- och bioteknik, Organisk kemi) ; J. Parkas
Bioresources (1930-2126). Vol. 6 (2011), 2, p. 920-926.
[Artikel, refereegranskad vetenskaplig]

The influence of cross-linking and branching on the number of interconnections between lignin units and the number of end groups (phenolic and non-phenolic) in the lignin molecules is discussed. Branching results in an increased number of end groups. It appears from an evaluation of the literature that p-hydroxyphenylpropane units are phenolic to a larger extent than guaiacylpropane units and that such units in turn are phenolic to a larger extent than syringylpropane units. It is proposed that this is related to the relative oxidation potentials of the lignin units. Guaiacylpropane units C-substituted in the 6-position are phenolic to a large extent. Alternative explanations for this are presented.

Nyckelord: Lignin, Phenolic units, End groups, Cross-linking, ray crystallographic investigations, oxidation-products, compression, wood, pine compression, spruce lignin, model, thioacidolyses, conformation, spectroscopy, ethers



Denna post skapades 2011-06-30. Senast ändrad 2013-01-09.
CPL Pubid: 142787

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Organisk kemi (2006-2014)

Ämnesområden

Kemi

Chalmers infrastruktur