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Use of new branched cationic polyacrylamides to improve retention and drainage in papermaking / Elisabete Antunes in Industrial & engineering chemistry research, Vol. 47 N° 23 (Décembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9370–9375 Titre : Use of new branched cationic polyacrylamides to improve retention and drainage in papermaking Type de document : texte imprimé Auteurs : Elisabete Antunes, Auteur ; Fernando A.P. Garcia, Auteur ; Paulo Ferreira, Auteur Année de publication : 2009 Article en page(s) : p. 9370–9375 Note générale : Chemistry engineering Langues : Anglais (eng) Mots-clés : Polyacrylamides  Improve  retention  Papermaking Résumé : Cationic polyacrylamides of very high molecular weight and with different charge densities and degrees of branching have been investigated as retention aids for papermaking. The effects of polymer charge density and polymer branching on drainage and retention of a suspension containing fibers and precipitated calcium carbonate have been correlated with flocs properties. Additionally, the effects of flocculant dosage and contact time with the furnish were investigated. Results show that polymers of medium charge density are more adequate to be used as retention aids since lower drainage time and higher filler retention are obtained at short contact time and low flocculant dosage. The branched polymers exhibited better performance than the linear polymers: drainage performance is significantly improved because highly branched polymers produce small flocs with a more open structure. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801216t [article] Use of new branched cationic polyacrylamides to improve retention and drainage in papermaking [texte imprimé] / Elisabete Antunes, Auteur ; Fernando A.P. Garcia, Auteur ; Paulo Ferreira, Auteur . - 2009 . - p. 9370–9375. Chemistry engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9370–9375 Mots-clés : Polyacrylamides  Improve  retention  Papermaking Résumé : Cationic polyacrylamides of very high molecular weight and with different charge densities and degrees of branching have been investigated as retention aids for papermaking. The effects of polymer charge density and polymer branching on drainage and retention of a suspension containing fibers and precipitated calcium carbonate have been correlated with flocs properties. Additionally, the effects of flocculant dosage and contact time with the furnish were investigated. Results show that polymers of medium charge density are more adequate to be used as retention aids since lower drainage time and higher filler retention are obtained at short contact time and low flocculant dosage. The branched polymers exhibited better performance than the linear polymers: drainage performance is significantly improved because highly branched polymers produce small flocs with a more open structure. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801216t