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Title
Contribution to the modification and characterization of different types of lignin
Authors
Adina-Mirela Capraru Valentin I. Popa Teodor Malutan and Gabriela Lisa
Received
November 2, 2009
Published
Volume 43 Issue 9-10 October-December
Keywords
wheat straw, Sarkanda grass, commercial lignin products (Protobind), hydroxymethylation,
Abstract
The paper presents the results obtained in the modification and characterization of residual lignins separated from the alkaline delignification of annual plants (Sarkanda grass and wheat straw), along with some commercial products (Protobind), offered by Granit Recherche Dévéloppement S.A., Lausanne, Switzerland. To this end, the lignins were subjected to a hydroxymethylation reaction under different temperature and pH conditions and then characterized by spectroscopy (FTIR, UV-VIS and fluorescence), as well as from the viewpoint of their thermal stability. The obtained data point out that the reactivity of lignins depends on the source, while the properties of the synthesized derivatives are consistent with the changes induced in their functionality.
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