Charge determination of porous substrates by polyelectrolyte adsorption

Wådgberg, Lars; Ödberg, Lars; Glad-Nordmark, Gunborg

doi:10.3183/npprj-1989-04-02-p071-076

Cited by 111 publications

(80 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The charges of the specific pulps, used in the present investigation, were not determined but average values for the charges of these types of pulps; i.e., both the total charge, as determined by Katz et al (1984) and the surface charge, as determined by polyelectrolyte adsorption (Wågberg et al, 1989) are summarized in Table 1.…”

Section: Pulpsmentioning

confidence: 99%

The use of polyelectrolyte complexes (PEC) as strength additives for different pulps used for production of fine paper

Gärdlund

Norgren

Wågberg

et al. 2007

Nordic Pulp &Amp; Paper Research Journal

View full text Add to dashboard Cite

SUMMARY:In this work the application of polyelectrolyte complexes (PEC) to different pulps, to improve the strength of papers produced from them, is compared with conventional pulp beating. The pulps chosen for the investigation were a fully bleached chemical hardwood pulp (HBK), a fully bleached chemical softwood pulp (SBK), and a peroxide-bleached chemithermomechanical pulp (BCTMP). The polyelectrolytes used were a polyamideamine epichlorohydrine condensate (PAE), traditionally used as a wet-strength additive, and carboxymethylcellulose. Since the prepared complexes had an anionic charge, they could only be used after fibre pre-treatment with the cationic PAE. Results indicate that the addition of 2% PAE and 2% PEC can improve all the measured tensile strength properties of the sheets as much as is commonly achieved by mechanically beating the pulps. In fact, for the chemical pulps, PEC addition at the chosen level produced better results than did traditional beating, since the improved tensile index and tensile energy absorption could be achieved without any significant deterioration in the light scattering coefficient of the papers produced. However, with the BCTMP a significant decrease in light scattering could be detected, especially following the addition of PEC.Adding the chemicals (especially the PEC) increased the sheet density and this together with the increase in the tensile stiffness, following chemical addition, resulted in a constant bending stiffness of the sheets. However, based on the results it can be suggested that a combination of unbeaten HBK and BCTMP treated with PAE and PEC can be used to produce a strong paper with a high bending stiffness.

show abstract

Section: Pulpsmentioning

confidence: 99%

The use of polyelectrolyte complexes (PEC) as strength additives for different pulps used for production of fine paper

Gärdlund

Norgren

Wågberg

et al. 2007

Nordic Pulp &Amp; Paper Research Journal

View full text Add to dashboard Cite

show abstract

“…According to Wågberg et al (1989), polyelectrolyte titration, which determines the amount of a charged polymer that is adsorbed on the fiber surface, has proved to be a popular method for the control of the wet end chemistry.…”

Section: Fiber Charge and Fiber Surfacementioning

confidence: 99%

“…The titration was performed in two ways: directly from the fiber suspension (which gives the charge density of the suspension) and then after fiber removal from the suspension. Although many methods have been developed for fibre charge measurement, titrations using a cationic polymer of high molecular weight are normally used to measure the charge on the fibre's surface (Wågberg et al 1989). …”

Section: Fiber Chargementioning

confidence: 99%

Fiber Surface and Paper Technical Properties of Eucalyptus globulus and Eucalyptus nitens Pulps after Modified Cooking and Bleaching

Antes¹,

Joutsimo²

2015

BioResources

View full text Add to dashboard Cite

The SuperBatch™(SB), CompactCooking™(CC), and Lo-Solids™ (LS) modified cooking methods were evaluated relative to the cell wall surface and paper technical properties of bleached Eucalyptus globulus and Eucalyptus nitens. E. globulus pulps presented higher screened yield and brightness than E. nitens, which needed higher H-factor to reach a kappa number target. Independently of the cooking method or species, all the samples consumed similar amounts of ClO2 to reach a brightness of 90% ISO. E. nitens pulps showed lower carbohydrates and higher extractives content on the fiber surface, regardless of the cooking method. E. nitens presented slightly higher surface charge of the bleached pulps. Surface charges of CC and LS pulps were higher independently of cooked Eucalyptus species. Water retention value (WRV) for E. nitens pulps were higher than for E. globulus. No differences were observed in refinability of different cooking methods, however E. nitens pulps showed higher tensile and lower bulk compared to E. globulus. E nitens presented a thinner fiber cell wall than E. globulus. This seems to be more relevant for paper technical properties and WRV than fiber charge or surface composition. No correlation between surface composition, fiber surface properties, and paper technical properties among the cooking methods could be determined.

show abstract

“…Polyelectrolyte titration was carried out to determine the surface charge according to the method described by Wågberg et al (1989). The excess of polymer in the solution was titrated with an anionic potassium polyvinyl sulphate polymer (KPVS), which together with a cationic indicator, toluidine blue, gave a colour shift from blue to pink at the end point of the titration.…”

Section: Instrumentsmentioning

confidence: 99%

The effect of increased pulp yield using additives in the softwood kraft cook on the physical properties of lowgrammage handsheets

Rahman

Lindström

Sandström

et al. 2017

Nordic Pulp &Amp; Paper Research Journal

View full text Add to dashboard Cite

ABSTRACT:The effect of increasing the pulp yield by the addition of sodium borohydride (NaBH 4 ) or polysulfide (PS) in softwood kraft cooking, i.e. enhancing the retention of glucomannan, on the physical properties of low-grammage handsheets was studied. In addition to the yield improvement, an increase in tensile index was observed, especially at lower degrees of beating. These higher yield pulps showed an increase in pore volume, indicating an increased degree of swelling of the fibres. Presumably, the increased flexibility of the fibres affects the bonding strength and leads to the higher tensile index observed.

show abstract

Charge determination of porous substrates by polyelectrolyte adsorption

Cited by 111 publications

References 0 publications

The use of polyelectrolyte complexes (PEC) as strength additives for different pulps used for production of fine paper

The use of polyelectrolyte complexes (PEC) as strength additives for different pulps used for production of fine paper

Fiber Surface and Paper Technical Properties of Eucalyptus globulus and Eucalyptus nitens Pulps after Modified Cooking and Bleaching

The effect of increased pulp yield using additives in the softwood kraft cook on the physical properties of lowgrammage handsheets

Contact Info

Product

Resources

About