Influence of adsorbed polyelectrolytes on pore size distribution of a water-swollen biomaterial

Aarne, Niko; Laine, Janne

doi:10.1039/c2sm07268h

Cited by 29 publications

(46 citation statements)

References 47 publications

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“…Maloney et al (1997) showed that some portion of the observed reduction in swellability associated by hornification may already be imparted by wet-pressing, even before the fibers have been subjected to drying. Aarne et al (2012b) found that cationic polyelectrolytes tended to promote irreversible closure of pores in the cell wall having widths greater than about 20 nm; the results were attributed to the suppression of osmotic swelling effects by adsorption of a cationic polyelectrolyte on negatively charged cellulosic surfaces.…”

Section: Viscoelastic Properties and Creepmentioning

confidence: 91%

Prospects for Maintaining Strength of Paper and Paperboard Products While Using Less Forest Resources: A Review

Hubbe¹

2013

BioResources

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Paper production requires large amounts of cellulosic fiber, whereas the world's forested lands and croplands have a finite capacity to supply such resources. To deal with likely future pressure on forest resources, as well as to hold down costs of materials, publications examined in the preparation of this review suggest that the paper industry will need to implement several concurrent strategies. In particular, the industry can be expected to view recycling as a central part of its activities. Basis weights of various paper-based products can be expected to decrease over the coming decades, and more of the fiber content will be replaced with fillers such as calcium carbonate. Such trends will place intense demands upon chemical-based strategies to enhance the bonding within paper and paperboard. Based on the literature, further progress in reducing the amount of new forest resources used to meet a given set of paper product requirements will require a combined approach, taking into account various fiber attributes, nanostructures, novel concepts in bond formation, and advances in the unit operations of papermaking.

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Section: Viscoelastic Properties and Creepmentioning

confidence: 91%

Prospects for Maintaining Strength of Paper and Paperboard Products While Using Less Forest Resources: A Review

Hubbe¹

2013

BioResources

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“…The average pore size in the macroscopic paper web is roughly between 1 and 10 lm (Resch et al 2010;Bennis et al 2010), the average pore size in pulp fibers is around 1-100 nm with mainly mesopores and macropores (Andreasson et al 2003;Aarne et al 2012;Lovikka et al 2016). Suspended particles have to be small enough not only for penetrating the paper matrix, but also for invading individual pulp fibers.…”

Section: Stability Factormentioning

confidence: 99%

Critical evaluation of approaches toward mass deacidification of paper by dispersed particles

Potthast

Ahn

2016

Cellulose

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Mass deacidification has been an important topic in cellulose science and will continue to be a critical issue as long as acidic books and paper-based materials are-a often major-part of library and archive stocks. Different means are available to judge the result of a deacidification treatment and to address its sustainability and efficacy. The present study compares deacidification by dispersed particles with procedures that apply homogeneously dissolved alkaline compounds, both under humid and dry accelerated aging conditions. Analysis by size-exclusion chromatography coupled to light scattering detection is used in combination with accelerated aging. The number of chain scissions, i.e. cellulose degradation, is the parameter used for evaluation, expressed as stabilization factors relative to the non-treated specimen. Upon deacidification with homogeneous solutions stability factors of about four were reached, while deacidification with dispersed particles gave only two times longer life times (stability factor of two). Mechanistic aspects are discussed in terms of alkaline reserve, cellulose degradation and mobilities of deacidification agents.

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“…Another approach in preventing the formation of hydrogen bonds is to introduce compounds that form bonds with cellulose that are reversible after rewetting, e.g., glucose or sucrose (Higgins and McKenzie 1963;Laivins and Scallan 1993;Zhang et al 2004). Recently, Aarne et al managed to slightly suppress hornification by adding high molecular weight cationic polyelectrolyte in excess before drying, which overcompensated the charge inside the larger pores and helped reopen them upon rewetting (Aarne et al 2012). …”

Section: Additivesmentioning

confidence: 99%

Proposed Nano-Scale Coalescence of Cellulose in Chemical Pulp Fibers During Technical Treatments

Pönni¹,

Vuorinen²

2012

BioResources

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This review summarizes the proposed mechanisms for irreversible coalescence of cellulose microfibrils within fibers during various common industrial treatments for chemical pulp fibers as well as the methods to evaluate it. It is a phenomenon vital for cellulose accessibility but still under considerable debate. The proposed coalescence mechanisms include irreversible hydrogen bonding. Coalescence is induced by high temperature and by the absence of obstructing molecules, such as water, hemicelluloses, and lignin. The typical industrial processes, in the course of which nano-scale coalescence and possible aggregation of cellulose microfibrillar elements occurs, are drying and chemical pulping. Coalescence reduces cellulose accessibility and therefore, in several instances, the quality of cellulose as a raw material for novel products. The degree of coalescence also affects the processing and the quality of the products. For traditional paper-based products, the loss of strength properties is a major disadvantage. Some properties lost during coalescence can be restored to a certain extent by, e.g., beating. Several factors, such as charge, have an influence on the intensity of the coalescence. The evaluation of the phenomenon is commonly conducted by water retention value measurements. Other techniques, such as deuteration combined with FTIR spectroscopy, are being applied for better understanding of the changes in cellulose accessibility.

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Influence of adsorbed polyelectrolytes on pore size distribution of a water-swollen biomaterial

Cited by 29 publications

References 47 publications

Prospects for Maintaining Strength of Paper and Paperboard Products While Using Less Forest Resources: A Review

Prospects for Maintaining Strength of Paper and Paperboard Products While Using Less Forest Resources: A Review

Critical evaluation of approaches toward mass deacidification of paper by dispersed particles

Proposed Nano-Scale Coalescence of Cellulose in Chemical Pulp Fibers During Technical Treatments

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