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Lignin characterization by acetylation procedures

dc.contributor.authorCateto, Carolina
dc.contributor.authorBelgacem, Mohamed Naceur
dc.contributor.authorRodrigues, Alírio
dc.contributor.authorBarreiro, M.F.
dc.date.accessioned2011-06-16T09:29:09Z
dc.date.available2011-06-16T09:29:09Z
dc.date.issued2005
dc.description.abstractThe amount of the total hydroxyl content of lignin is of great importance in the formulation of a lignin based polyurethane system since it allows the quantity of the polyisocyanate counterpart within the right stoichiometry. In this work, the reliability of an acetylation procedure, regarding the determination of total hydroxyl content of a commercial kraft lignin, was studied. Lignin was acetylated using acetic anhydride reagent in solution in pyridine and the recovered acetylated samples were analysed by FTIR using KBr pellets. The experimental variables investigated were: reaction time, reaction temperature, composition of the acetylation reagent, presence of a catalyst and drying process of the acetylated samples. Within this work, the obtained results indicate that acetylation was incomplete for all the studied conditions, resulting in an unreliable total hydroxyl determination and shows the limitation of this technique. This observation is in accordance with recent published works (see, for example, Gosselink et al., 2004) and could justify the lack of agreement among some published experimental results concerning interlaboratory analysis.por
dc.identifier.citationCateto, C.A.; Belgacem, M.N.; Rodrigues, A.E.; Barreiro, M.F. (2005). Lignin characterization by acetylation procedures. In 9th International Chemical Engineering Conference - CHEMPOR 2005. Coimbra, Portugalpor
dc.identifier.urihttp://hdl.handle.net/10198/5218
dc.language.isoengpor
dc.subjectLigninpor
dc.subjectPolyurethanespor
dc.subjectSynthesispor
dc.subjectAcetylationpor
dc.subjectHydroxyl determinationpor
dc.titleLignin characterization by acetylation procedurespor
dc.typeconference poster
dspace.entity.typePublication
oaire.citation.conferencePlaceCoimbra, Portugalpor
oaire.citation.title9th International Chemical Engineering Conference - CHEMPOR 2005por
person.familyNameBarreiro
person.givenNameFilomena
person.identifier.ciencia-id3418-47D5-5746
person.identifier.orcid0000-0002-6844-333X
person.identifier.ridL-9802-2014
person.identifier.scopus-author-id57188719717
rcaap.rightsopenAccesspor
rcaap.typeconferenceObjectpor
relation.isAuthorOfPublication0391987c-ba90-488b-839a-153447ce1f0f
relation.isAuthorOfPublication.latestForDiscovery0391987c-ba90-488b-839a-153447ce1f0f

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