Cellulose Dissolution in an Alkali Based Solvent: Influence of Additives and Pretreatments

Kihlman, Martin; Medronho, Bruno; Romano, Anabela; Germgård, Ulf; Lindman, Björn

doi:10.5935/0103-5053.20130038

Cited by 56 publications

(35 citation statements)

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“…Following the literature, cellulose chain-chain association is driven by Coulomb forces, 34,35 van der Waals interactions, hydrogen bonds and, following Lindman, hydrophobic interactions also play an important role. [36][37][38] Otherwise, cellulose adhesion using cellulose solutions may be understood as just another successful case of bonding polymer materials with a solution of the same polymer, which in general promotes good adhesion 14 due to chain entanglements and surface plastic deformation. Cellulosic fiber bonding phenomena (fiber-to-fiber bond) have been recently investigated by Hirn and collaborators.…”

Section: Resultsmentioning

confidence: 99%

Adhesive and Reinforcing Properties of Soluble Cellulose: A Repulpable Adhesive for Wet and Dry Cellulosic Substrates

Ferreira

Lanzoni

Costa

et al. 2015

ACS Appl. Mater. Interfaces

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This work reports, for the first time, the excellent performance of an aqueous alkaline solution of cellulose as an adhesive for wet and dry cellulosic substrates. Uniaxial tensile tests of filter paper and sulfite writing paper strips bonded with this adhesive (5% cellulose and 7% NaOH aqueous solution) show that failure never occurs in the joints but always in the pristine substrate areas, except in butt joint samples prepared with sulfite paper. Tensile test also shows that paper impregnated with cellulose solution is stronger than the original substrate. X-ray microtomography and scanning electron microscopy reveal that dissolved cellulose fills the gaps between paper fibers, providing a morphological evidence for the mechanical interlocking adhesion mechanism, while scanning probe techniques provide a sharp view of different domains in the joints. Additionally, bonded paper is easily reconverted to pulp, which facilitates paper reprocessability, solving a well-known industrial problem related to deposition of adhesive aggregates (stickies) on the production equipment.

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Section: Resultsmentioning

confidence: 99%

Adhesive and Reinforcing Properties of Soluble Cellulose: A Repulpable Adhesive for Wet and Dry Cellulosic Substrates

Ferreira

Lanzoni

Costa

et al. 2015

ACS Appl. Mater. Interfaces

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“…The window for optimal dissolution of cellulose in NaOH is rather narrow, ranging between 1.5 and 2.5 M (Cai and Zhang 2005;Kihlman et al 2013) and outside of it, only minute quantities of cellulose is dissolved. To perform the study of the effect of NaOH concentration, the samples were prepared as 0.020 g/ cm 3 at 2.0 M and then diluted to 0.010 g/cm 3 and desired NaOH concentration by mixing 50 wt% of the stem solution with 50 wt% of either water or a solution of 1.0, 3.0, or 4.0 M NaOH.…”

Section: Effect Of Naoh Concentrationmentioning

confidence: 99%

On the dissolution state of cellulose in cold alkali solutions

et al. 2017

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We have characterized the dissolved state of microcrystalline cellulose (MCC) in cold alkali [2.0 M NaOH(aq)] solutions using a combination of small angle X-ray (SAXS) and static light scattering (SLS), 1 H NMR, NMR self-diffusion, and rheology experiments. NMR and SAXS data demonstrate that the cellulose is fully molecularly dissolved. SLS, however, shows the presence of large concentration fluctuations in the solution, consistent with significant attractive cellulose-cellulose interactions. The scattering data are consistent with fractal cellulose aggregates of micrometre size having a mass fractal dimension D $ 1:5. At 25 C the solution structure remains unchanged on the time scale of weeks. However, upon heating the solutions above 35 C additional aggregation occurs on the time scale of minutes. Decreasing or increasing the NaOH concentration away from the ''optimum'' 2 M also leads to additional aggregation. This is seen as an increase of the SAXS intensity at lower q values. Addition of urea (1.8 and 3.6 M, respectively) does not significantly influence the solution structure. With these examples, we will discuss how scattering methods can be used to assess the quality of solvents for cellulose.

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“…The beneficial effect of relatively small amounts of ZnO to concentrated NaOH solutions has been observed by, among others, Borgin and Stamm (1950) and Vehvilainen et al (2008). Probably, sodium zincate ion, Zn(OH) 4 2-, is formed as a reaction product of ZnO with NaOH and its association with cellulose introduces a negative charge into the molecules (Kihlman et al 2013).…”

Section: Introductionmentioning

confidence: 96%

Enzyme pretreatment of dissolving pulp as a way to improve the following dissolution in NaOH/ZnO

et al. 2013

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Cellulose Dissolution in an Alkali Based Solvent: Influence of Additives and Pretreatments

Cited by 56 publications

References 0 publications

Adhesive and Reinforcing Properties of Soluble Cellulose: A Repulpable Adhesive for Wet and Dry Cellulosic Substrates

Adhesive and Reinforcing Properties of Soluble Cellulose: A Repulpable Adhesive for Wet and Dry Cellulosic Substrates

On the dissolution state of cellulose in cold alkali solutions

Enzyme pretreatment of dissolving pulp as a way to improve the following dissolution in NaOH/ZnO

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