Polyelectrolyte swelling behavior of chlorite delignified spruce wood fibers

Carlsson, Gilbert; Kolseth, Petter; Lindström, Tom

doi:10.1007/bf00351833

Cited by 24 publications

(17 citation statements)

References 1 publication

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“…Thus, more MFC is bound to the fibers with the aid of CS and also the swelling of the fibers and fibrils increase causing a decrease of the dewatering rate. The swelling maximum was found at pH 12 which is higher than typically found with bleached kraft pulp suspensions (pH 7-8) (Lindström and Carlsson 1982;Carlsson et al 1983). Ahola et al 2008b have also shown that the swelling (water uptake) of both enzymatically hydrolyzed (low charge) and carboxymethylated (high charge) NFC model films increased considerably above pH 8.…”

Section: Properties Of Mfc and Finesmentioning

confidence: 94%

Effect of microfibrillated cellulose and fines on the drainage of kraft pulp suspension and paper strength

et al. 2010

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Different types of microfibrillated cellulose (MFC) and fines suspensions were produced, characterized, and then added to a papermaking pulp suspension. High and medium molar mass cationic polyelectrolytes were used as fixatives. The drainage behavior of the pulp suspensions with additives were evaluated against the strength properties of hand sheets made thereof. The effects of salt concentration, pH, fixative type, dosage and type of fibrillar material on drainage were examined. All the MFC and fines samples produced had clearly different properties due to their dissimilar production methods, and they also introduced specific responses on the measured drainage and paper strength. Generally, the addition of MFC decreased the drainage rate of pulp suspension and increased the strength of paper. However, it was shown that by optimum selection of materials and process conditions an enhancement of the strength properties could be achieved without simultaneously deteriorating the drainage.

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Section: Properties Of Mfc and Finesmentioning

confidence: 94%

Effect of microfibrillated cellulose and fines on the drainage of kraft pulp suspension and paper strength

et al. 2010

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“…* indicates statistical significance between 0 M NaCl and 1 M NaCl for individual pretreatment conditions (Student's t test 95% confidence). 39 and 136 Å in the 160°C LHW and 190°C LHW condition; however, larger probe volumes were similar to the 0 g/g H 2 O 2 AHP-only pretreated sample. In addition, overall accessible volumes were considerably lower compared to AHP-only pretreated samples, indicating limited accessible volume formation in LHW-only samples.…”

Section: ■ Methods and Materialsmentioning

confidence: 78%

Relating Nanoscale Accessibility within Plant Cell Walls to Improved Enzyme Hydrolysis Yields in Corn Stover Subjected to Diverse Pretreatments

Crowe¹,

Zarger²,

Hodge

2017

J. Agric. Food Chem.

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Simultaneous chemical modification and physical reorganization of plant cell walls via alkaline hydrogen peroxide or liquid hot water pretreatment can alter cell wall structural properties impacting nanoscale porosity. Nanoscale porosity was characterized using solute exclusion to assess accessible pore volumes, water retention value as a proxy for accessible water−cell walls surface area, and solute-induced cell wall swelling to measure cell wall rigidity. Key findings concluded that delignification by alkaline hydrogen peroxide pretreatment decreased cell wall rigidity and that the subsequent cell wall swelling resulted increased nanoscale porosity and improved enzyme binding and hydrolysis compared to limited swelling and increased accessible surface areas observed in liquid hot water pretreated biomass. The volume accessible to a 90 Å dextran probe within the cell wall was found to be correlated to both enzyme binding and glucose hydrolysis yields, indicating cell wall porosity is a key contributor to effective hydrolysis yields.

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“…Accordingly, in aqueous suspensions cellulose fibers act äs powerful cation exchangers showing obvious preference for cations of higher valency such äs Mg 2+ and Ca 2+ . Both carboxylic acids and free phenolic hydroxyl groups participate in the cation exchange process (Carlsson et al 1983, Scallan 1983). The degree of swelling is usually a function of the osmotic pressure of the counterions and it increases in the order Fe 3+ <Al 3+ <H + <Ca 2+ <Mg 2+ <NH 4 + <Na+ (Scallan 1983).…”

Section: Effect Of Fiber Treatmentsmentioning

confidence: 98%

Beating Behaviour and Sheet Strength Development of Coniferous Organosolv Fibers

Paszner¹,

Behera²

1985

Holzforschung

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Polyelectrolyte swelling behavior of chlorite delignified spruce wood fibers

Cited by 24 publications

References 1 publication

Effect of microfibrillated cellulose and fines on the drainage of kraft pulp suspension and paper strength

Effect of microfibrillated cellulose and fines on the drainage of kraft pulp suspension and paper strength

Relating Nanoscale Accessibility within Plant Cell Walls to Improved Enzyme Hydrolysis Yields in Corn Stover Subjected to Diverse Pretreatments

Beating Behaviour and Sheet Strength Development of Coniferous Organosolv Fibers

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