Results 11 to 20 of about 196,446 (216)
, 2012 Many materials, man-made and natural, have a composite structure, i.e. they comprise two or more constituent materials with distinct differences. Concrete is a common example. It consists of sand or gravel, cement and water. Wood is also a composite.
Kouisni, Lamfeddal +6 more
core +6 more sources
On the structure of softwood kraft lignin
Green Chemistry, 2017 Two constitutional structural schemes are proposed attempting to unify and rationalize a series of focused NMR and chromatographic determinations aimed at providing an integrated picture for the structure of softwood kraft lignin.
Claudia Crestini +3 more
core +5 more sources
Methacrylated Kraft lignin as a double-edged sword: a quantitative analysis of Kraft lignin-containing objects printed by stereolithography [PDF]
, 2023 Finding an alternative to fossil-based resins which is renewable, sustainable, and affordable is an important step to enable large-scale industrial manufacturing using stereolithography.
Stephen, Chmely +4 more
core +1 more source
Understanding sulfonated kraft lignin re-polymerization by ultrafast reactions in supercritical water [PDF]
, 2022 Producción CientíficaRe-polymerization reactions are a commonly reported issue on the way to the higher recovery of monomers from lignin. The reactivity of monomers obtained from lignin depolymerization and their contribution to the re-polymerization in ...
Balakshin, Mikhail +5 more
core +1 more source
Valorization of Kraft Lignin by mechanochemical processing with sodium percarbonate [PDF]
, 2022 Lignin is a highly underused resource. The complex and heterogeneous structure poses a challenge to industry and science. Problems are high polydispersity, high-molar-mass and insufficient functional groups.
Jana, Falkenhagen +3 more
core +2 more sources
Dissolution of kraft lignin in alkaline solutions [PDF]
International Journal of Biological Macromolecules, 2020 Lignins are among the most abundant renewable resources on the planet. However, their application is limited by the lack of efficient dissolution and extraction methodologies. In this work, a systematic and quantitative analysis of the dissolution efficiency of different alkaline-based aqueous systems (i.e.
Melro, Elodie +6 more
openaire +3 more sources
Kraft Lignin Behaviour in Diffused Aeration of Kraft Effluents
Water Science and Technology, 1988 Diffused aeration experiments carried out using a Kraft black liquor in batch reactors at 21±1ΩC were performed in order to characterize the relative importance of the mechanisms of chemical oxidation and condensation of lignin structures upon COD, lignin and colour removal and also to evaluate the influence of agitation intensity on these mechanisms ...
L. Larrea, C.F. Forster, D. Melé
openaire +1 more source
Preparation and Characterization of Lignin Polyols from the Residues of Oil Palm Empty Fruit Bunch
BioResources, 2015 In this work, lignin polyols were prepared from the liquefaction of kraft lignin and from the direct liquefaction of Elaeis guineensis lignocellulosic waste. The liquefaction reaction was performed with polyhydric alcohols using sulfuric acid as catalyst
Abbas Hasan Faris +4 more
doaj +1 more source
Revista Árvore, 2003 Neste estudo foram avaliados os efeitos do conteúdo e da natureza da lignina residual na eficiência e na seletividade do branqueamento com ozônio de polpa kraft convencional (kraft) e pré-deslignificada com oxigênio (kraft-O).
Elenice Pereira Maia +1 more
doaj +1 more source
Fungal Treatment Modifies Kraft Lignin for Lignin- and Cellulose-Based Carbon Fiber Precursors [PDF]
, 2020 The kraft lignin's low molecular weight and too high hydroxyl content hinder its application in bio-based carbon fibers. In this study, we were able to polymerize kraft lignin and reduce the amount of hydroxyl groups by incubating it with the white-rot ...
Nousiainen, Paula A. +13 more
core +1 more source