Oxidation and sulfonation of cellulosics

Abstract

Bleached hardwood (HW) kraft pulp and derived nanocellulosic structures were modified by a periodate oxidation followed by treatment with sodium bisulfite to yield the corresponding C2/3 sulfonates. The impact of this oxidative-reductive protocol on the chemical and physical properties of cellulose was evaluated by determining physical dimensions, functional groups, and their water absorbency properties. It was found that the water absorbency of cellulosic material can be enhanced by 8.0-199.0% with this oxidation/sulfonation protocol. Distinct differences were observed between sulfonated pulp fibers and nanocellulosic structures, with the latter exhibiting relatively higher water retention values (WRV).

Preparation and Characterization of Aldehyde-Functionalized Cellulosic Fibers through Periodate Oxidization of Bamboo Pulp

“…The most efficient method is oxidation with periodates, which cleaves the pyranose ring and introduces aldehyde groups at both the C-2 and C-3 positions on cellulose molecules. The derived aldehyde groups can further react with amino, hydroxyl, and carboxyl groups, resulting in new functional chemical bonds, further broadening the potential applications for cellulosic fibers (Heinze and Liebert 2001;Calvini et al 2006;Potthast et al 2007;Zhang et al 2008). However, there has been a shortage of systematic research on the periodate modification of bamboo fibers.…”

Sulfonated nanocellulose beads as potential immunosorbents

“…Following the oxidation, a sulfonation reaction was performed using the method developed by Zhang et al (2007) and about 50% degree of sulfonation was intended. This degree of sulfonation was chosen in order to preserve the other half of the aldehyde groups for future coupling with specific antibodies.…”

Enhanced Absorbent Products Incorporating Cellulose and Its Derivatives: A Review

“…The most widely used tissue and towel products are typically made from delignified wood fibers; in other words they are mainly comprised of cellulose and hemicellulose (Gigac and Fiserova 2008). As documented in Table A, the absorbency of ordinary delignified cellulosic fibers often lies in the range between 2 and 10 g/g, based on tests with pure water (Shepherd and Xaio 1999;Gigac and Fiserova 2008;Zhang et al 2008a;Beuther et al 2010). Mechanical pulp fibers, which contain essentially all of the relatively hydrophobic and rigid lignin that was originally present in the wood, tend to absorb less water in comparison to kraft or sulfite (delignified) fibers (Eriksson et al 1991).…”

“…TEMPO-mediated oxidation) has been shown to greatly increase water absorbency of softwood kraft pulps . Periodate oxidation has been shown to offer an alternative means of achieving similar effects (Zhang et al 2008a).…”

“…Bristow (1972) introduced this concept as a means of accounting for the absorption capacities of fiberboard products. Factors affecting the swelling of cellulosic fibers have been considered in various studies (Jayme andBüttel 1964, 1968;Scallan and Carles 1972;Gigac and Fiserova 2008;Zhang et al 2008a;Cheng et al 2010;Lund et al 2011).…”