Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/42736
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dc.contributor.authorAguado, Roberto-
dc.contributor.authorLourenço, Ana F.-
dc.contributor.authorFerreira, Paulo J.-
dc.contributor.authorMoral, Ana-
dc.contributor.authorTijero, Antonio-
dc.date.accessioned2017-04-28T16:42:27Z-
dc.date.available2018-04-29T00:00:38Z-
dc.date.issued2017-04-28-
dc.identifier.issn0969-0239por
dc.identifier.issne1572-882Xpor
dc.identifier.urihttp://hdl.handle.net/10316/42736-
dc.description.abstractWater-soluble cationic cellulose derivatives were synthesized by three different procedures, cationizing bleached hardwood kraft pulp with (3- chloro-2-hydroxypropyl) trimethylammonium chloride. The first procedure involved a previous depolymerization step with orthophosphoric acid. The second one consisted on dissolving cellulose in NaOH/urea before cationization. For the third procedure, the reaction medium was heterogeneous since it was carried out with a part of cellulose with high degree of polymerization. Oppositely to the common methods, cationization occurred under mild conditions. Differences among the three derivatives are illustrated by X-ray diffraction patterns of pretreated samples, infrared spectra, and determinations of the degree of substitution, the zeta potential, the charge density and the molecular weight. The performance of these polyelectrolytes for the flocculation of mineral fillers used in papermaking was tested by laser diffraction spectrometry. The flocculant with the highest degree of polymerization and charge originated the best results, particularly when the filler used was kaolin, proving that water-soluble cationic cellulose derivatives can aid in the flocculation of fillers used in papermaking. On the contrary, the shortestchained derivative was not effective. The results were interpreted in terms of the characteristics of the cellulose derivatives flocculants and of the fillers, and neutralization and patching were proposed as the dominant mechanisms.por
dc.language.isoengpor
dc.publisherSpringerpor
dc.rightsembargoedAccess-
dc.subjectCationizationpor
dc.subjectCellulosepor
dc.subjectFillers for papermakingpor
dc.subjectFlocculationpor
dc.subjectLaser diffraction spectrometrypor
dc.titleCationic cellulosic derivatives as flocculants in papermakingpor
dc.typearticle-
degois.publication.firstPage3015por
degois.publication.lastPage3027por
degois.publication.issue7por
degois.publication.titleCellulosepor
dc.relation.publisherversionhttps://link.springer.com/content/pdf/10.1007%2Fs10570-017-1313-y.pdfpor
dc.peerreviewedyespor
dc.identifier.doi10.1007/s10570-017-1313-ypor
dc.identifier.doi10.1007/s10570-017-1313-y-
degois.publication.volume24por
item.fulltextCom Texto completo-
item.languageiso639-1en-
item.grantfulltextopen-
crisitem.author.deptFaculty of Sciences and Technology-
crisitem.author.parentdeptUniversity of Coimbra-
crisitem.author.researchunitCQC - Coimbra Chemistry Centre-
crisitem.author.researchunitCIEPQPF – Chemical Process Engineering and Forest Products Research Centre-
crisitem.author.researchunitCIEPQPF – Chemical Process Engineering and Forest Products Research Centre-
crisitem.author.parentresearchunitFaculty of Sciences and Technology-
crisitem.author.orcid0000-0001-9864-1794-
crisitem.author.orcid0000-0002-2860-9833-
crisitem.author.orcid0000-0002-4503-6811-
Appears in Collections:FCTUC Eng.Química - Artigos em Revistas Internacionais
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