The effect of molecular weight on the performance of paper strength-enhancing polymers
2001 (English)In: Journal of Pulp and Paper Science (JPPS), ISSN 0826-6220, Vol. 27, no 5, 145-151 p.Article in journal (Refereed) Published
The influence of dextran molecular weight (77 000 to 2 000 000) on the strength of fibre-fibre bonds was investigated. A series of cationic dextrans with different molecular weights, from 77 000 to 2 000 000, was prepared and the adsorption behaviour on fibre was characterized. The maximum amount of adsorbed dextran increased with decreasing molecular weight, while the adsorbed layer thickness on colloidal silica increased with increasing molecular weight. At saturation coverage, the molecular weight of dextran did nor affect the tensile strength of handsheets made from unbeaten bleached kraft pulp. The strength improvement with polymer addition did not correspond to increased optical bonded area (opacity). The external surface of fibre accessible to dextran of molecular weight 2 000 000 was estimated as 35 m(2)/g.
Place, publisher, year, edition, pages
2001. Vol. 27, no 5, 145-151 p.
molecular weight, dextrans, fiber bonding, cationic compounds, hand sheets, mechanical properties, kraft pulps, cationic polyacrylamides, polystyrene latex, cellulose fibers, bond strength, adsorption, water
IdentifiersURN: urn:nbn:se:kth:diva-20601ISI: 000168548500001OAI: oai:DiVA.org:kth-20601DiVA: diva2:339297
QC 201005252010-08-102010-08-10Bibliographically approved