Fibre porosity development of dissolving pulp during mechanical and enzymatic processing

Grönqvist, Stina; Hakala, Tapio; Kamppuri, Taina; Vehviläinen, Marianna; Hänninen, Tuomas; Liitiä, Tiina; Maloney, Thaddeus; Suurnäkki, Anna

doi:10.1007/s10570-014-0352-x

Cited by 55 publications

(35 citation statements)

References 26 publications

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“…For example, it was reported that the mechanical refining can result in the breakage of internal bonds and delamination of the fiber wall, thus improving the porosity of the fiber wall (Grönqvist et al, 2014). In another study, Tian et al (2013) reported that the mechanical refining can lead to:…”

Section: Proposed Concept Of Combined Mechanical Refining and Cce Formentioning

confidence: 99%

“…Grönqvist et al (2014) reported that a shredding treatment of 300 min resulted in increases in the micro-pores volume (from 0.42 to 0.47 ml/g) and total pore volume (from 0.53 to 0.82 ml/g) for a softwood dissolving pulp. Hui et al (2009) found that the WRV of a mixed hardwood kraft pulp increased by 30%, after a 3000 revolutions PFI refining.…”

Section: Influence Of Mechanical Refining On Fiber Morphologiesmentioning

confidence: 99%

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Mechanical pretreatment improving hemicelluloses removal from cellulosic fibers during cold caustic extraction

Liu

Duan

et al. 2015

Bioresource Technology

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Section: Proposed Concept Of Combined Mechanical Refining and Cce Formentioning

confidence: 99%

Section: Influence Of Mechanical Refining On Fiber Morphologiesmentioning

confidence: 99%

Mechanical pretreatment improving hemicelluloses removal from cellulosic fibers during cold caustic extraction

Liu

Duan

et al. 2015

Bioresource Technology

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“…A single measurement with a dextran which is too large to penetrate into the cell wall (2 9 10 6 Dalton dextran) is used to determine the pore volume or fiber saturation point (FSP) of wet pulp fibers. Further discussion of the method can be found in [20] and more recently in [11].…”

Section: Reference Porosimetrymentioning

confidence: 99%

“…The porous structure of cellulose is extremely important in many processing and end use applications. This includes enzymatic hydrolysis [11], chemical modification [12], fiber swelling [13], and rheology [14]. Of particular interest today is an emerging class of ''nanocelluloses'' [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Thermoporosimetry of hard (silica) and soft (cellulosic) materials by isothermal step melting

Maloney

2015

J Therm Anal Calorim

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In this study, the pore size distribution of silica aerogels is measured with thermoporosimetry and compared with results from cellulosic materials. The isothermal step melting method is shown to be a useful method to eliminate thermal lag and measures relatively large pores which have a small melting temperature depression. It is shown that for porous silica, pore volumes can be accurately measured by isothermal step melting and that pore diameter can be calculated from the Gibbs-Thomson equation. The nonfreezing water is found to be a monolayer on the pore wall, indicating that hydrated surface area may be probed with this method. The isothermal step melting method is also shown to be very useful to measure pore size distribution of cellulosic materials. However, the Gibbs-Thomson constant for cellulosic materials is markedly different than for porous silica. The pore size distribution for Kraft pulp fibers and for two types of nanocellulose is reported.

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“…In addition, using different techniques, it has been shown that internal structural changes occurred to the pulp fibers as a result of enzymatic action (Saake et al 1995). Increasing the enzyme dosage also increases the accessible surface area by opening the macropores (Gronqvist et al 2014) or nanopores (Penttila et al 2010) of the fibers.…”

Section: The Effect Of Xylanase Modification On Pulp Fiber Qualitymentioning

confidence: 99%

Reactivity Improvement of Bamboo Dissolving Pulp by Xylanase Modification

Zhou

et al. 2015

BioResources

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A high reactivity is an essential prerequisite for dissolving pulp. In this study, xylanase modification to increase the reactivity of bamboo dissolving pulp was investigated. The original reactivity of a bamboo dissolving pulp prepared by a prehydrolysis kraft pulping process and bleached by (OP)-H-P (oxygen delignification enhanced with peroxidesodium hypochlorite -peroxide) is very low. The reactivity of the pulp was increased drastically after xylanase modification, which lowered the pulp's pentosan content. Simultaneously, the crystallinity index of the dissolving pulp decreased slightly after xylanase modification. The microscopic appearance of the fiber surfaces changed slightly. The average curl and kink indices were lower at a xylanase charge of 1.0 IU/g compared to the other charges, while changes to the yield loss and the degree of polymerization were negligible. The mechanism for the increased pulp reactivity is discussed.

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Fibre porosity development of dissolving pulp during mechanical and enzymatic processing

Cited by 55 publications

References 26 publications

Mechanical pretreatment improving hemicelluloses removal from cellulosic fibers during cold caustic extraction

Mechanical pretreatment improving hemicelluloses removal from cellulosic fibers during cold caustic extraction

Thermoporosimetry of hard (silica) and soft (cellulosic) materials by isothermal step melting

Reactivity Improvement of Bamboo Dissolving Pulp by Xylanase Modification

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