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Treatment of fractionated fibers with various cationic-modified poly(vinyl alcohols) and Its iImpact on paper properties / Pedram Fatehi in Industrial & engineering chemistry research, Vol. 48 N° 23 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 23 (Décembre 2009) . - pp. 10485–10490 Titre : Treatment of fractionated fibers with various cationic-modified poly(vinyl alcohols) and Its iImpact on paper properties Type de document : texte imprimé Auteurs : Pedram Fatehi, Auteur ; Jeffery E. Ward, Auteur ; Huining Xiao, Auteur Année de publication : 2010 Article en page(s) : pp. 10485–10490 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Treatment--Fractionated  Fibers--Various--Cationic-Modified--Poly(vinyl  alcohols--Impact--Paper  Properties Résumé : In this work, the effects of various high molecular weight cationic poly(vinyl alcohols), CPVAs, on the fiber morphology and the properties of papers made from fractionated refined fibers were investigated. At first, bleached sulfite fibers were refined under various revolutions and then refined fibers were fractionated under various time intervals to obtain refined fibers with a similar fiber length and fines content. Then, 20 mg/g CPVAs with various charge densities was adsorbed on the fractionated refined fibers prior to making hand sheets. The results showed that the lower the charge density of CPVA, the higher the effectiveness of CPVA in improving the paper strength at any refining revolution. The reasons for such a phenomenon were perhaps the different configurations of CPVAs on the surface of the fibers and the different adhesion/repulsion forces developed between CPVA-modified fibers in hand sheets. Also, by reducing the freeness of the fractionated fibers (increasing the refining revolutions), the effect of CPVA in improving the paper strength was reduced. In this case, the CPVAs tended to cover the fibrils on the fiber surface, which was demonstrated by SEM observations, thus reducing the contact area of the fractionated refined fibers. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900999n [article] Treatment of fractionated fibers with various cationic-modified poly(vinyl alcohols) and Its iImpact on paper properties [texte imprimé] / Pedram Fatehi, Auteur ; Jeffery E. Ward, Auteur ; Huining Xiao, Auteur . - 2010 . - pp. 10485–10490. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 23 (Décembre 2009) . - pp. 10485–10490 Mots-clés : Treatment--Fractionated  Fibers--Various--Cationic-Modified--Poly(vinyl  alcohols--Impact--Paper  Properties Résumé : In this work, the effects of various high molecular weight cationic poly(vinyl alcohols), CPVAs, on the fiber morphology and the properties of papers made from fractionated refined fibers were investigated. At first, bleached sulfite fibers were refined under various revolutions and then refined fibers were fractionated under various time intervals to obtain refined fibers with a similar fiber length and fines content. Then, 20 mg/g CPVAs with various charge densities was adsorbed on the fractionated refined fibers prior to making hand sheets. The results showed that the lower the charge density of CPVA, the higher the effectiveness of CPVA in improving the paper strength at any refining revolution. The reasons for such a phenomenon were perhaps the different configurations of CPVAs on the surface of the fibers and the different adhesion/repulsion forces developed between CPVA-modified fibers in hand sheets. Also, by reducing the freeness of the fractionated fibers (increasing the refining revolutions), the effect of CPVA in improving the paper strength was reduced. In this case, the CPVAs tended to cover the fibrils on the fiber surface, which was demonstrated by SEM observations, thus reducing the contact area of the fractionated refined fibers. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900999n