Results 151 to 160 of about 3,914 (194)
Some of the next articles are maybe not open access.
Kraft lignin utilization in adhesives
Wood Science and Technology, 1988The utilization of lignin from Pinus radiata black liquor, as a copolymer in ligninphenol-formaldehyde resin binders was studied. Methylolation, demethylation and ultrafiltration separation of high molecular-weight fractions were carried out in order to increase lignin reactivity.
OLIVARES, M +3 more
openaire +1 more source
Polyurethane from kraft lignin
British Polymer Journal, 1989AbstractThe condensation of lignin with hexamethylene diisocyanate (HDI) or of a mixture of lignin‐poly(ethylene oxide) (PEO) with HDI was investigated. The lignin used in this study was a kraft lignin from Pinus maritima, and was obtained from black liquor by acidification, filtration and vacuum drying.
H. Cheradame +4 more
openaire +1 more source
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. It has strong, crystalline cellulose structures glued together by hemicelluloses and lignin. The unique
Kouisni, Lamfeddal +6 more
openaire +3 more sources
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. It has strong, crystalline cellulose structures glued together by hemicelluloses and lignin. The unique
Kouisni, Lamfeddal +6 more
openaire +3 more sources
Simulation of Kraft Lignin Pyrolysis
1985The profitable conversion of lignin to low-molecular-weight products is hindered by the complexity of both its chemical structure and also its conversion product spectra. These complexities not only mask the actual fundamental events occurring during lignin processing but render design, scale-up and optimization difficult.
Francis P. Petrocelli, Michael T. Klein
openaire +1 more source
On the structure of softwood kraft lignin
Green Chemistry, 2017Two 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
openaire +3 more sources
Journal of Applied Polymer Science, 1990
AbstractPolyurethane films were prepared by solution casting using a three‐component system consisting of polymeric MDI, a propylene oxide‐based polyether triol and kraft lignin fractions of different molecular weights. The polyether triol was used as soft segment.
Hirohisa Yoshida +3 more
openaire +1 more source
AbstractPolyurethane films were prepared by solution casting using a three‐component system consisting of polymeric MDI, a propylene oxide‐based polyether triol and kraft lignin fractions of different molecular weights. The polyether triol was used as soft segment.
Hirohisa Yoshida +3 more
openaire +1 more source
Kraft Lignins: A New Perspective
1986Among the naturally occurring polymers, lignins are second only to cellulose in abundance, and in terms of energy content they might actually be the most abundant. They are found as cell-wall components in all dryland arborescent and herbaceous plants. Native lignins are generally conceived as being cross-linked macromolecules of “infinite” extent that
Theodore M. Garver, Simo Sarkanen
openaire +1 more source
Influence of Ozonized Kraft Lignin on the Crystallization of CaCO3
Journal of Colloid and Interface Science, 2002Results are reviewed from a study examining how structural modifications introduced by ozonization enhance the influence of kraft lignin on the crystallization of CaCO(3). Ozone treatment of kraft lignin in an aqueous environment is shown to increase its carboxylic acid and overall oxygen content and reduce its molecular weight.
Steven J, Severtson, Jihui, Guo
openaire +2 more sources
Kraft Lignin: A Valuable, Sustainable Resource, Opportunities and Challenges
ChemSusChem, 2023Joseph Samec +2 more
exaly