Synthesis and photo-bactericidal properties of a cationic porphyrin grafted onto kraft pulp fibers

With the increased risk of infectious disease transmissions, photodynamic inactivation of some microorganisms for antimicrobial applications has been extensively studied in recent years. In this article, we describe the synthesis of novel photo-bactericidal materials by grafting propargylated 5,10,15,20-tetra(4-pyridyl)porphyrin on kraft pulp fibers. The grafting was carried out by a Huisgen’s 1,3-dipolar azide-alkyne cycloaddition reaction. This material has been investigated for its antibacterial properties against Escherichia coli, Pseudomonas aeruginosa and Staphylococcus aureus. An interesting photo-bactericidal activity was shown: this material can be used to limit the growth of bacteria on surfaces and the formation of biofilms.

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Desorption of Cationic Polyacrylamide from Bleached Kraft Pulp Fibers

Water Science & Technology ◽

10.2166/wst.1987.0272 ◽

1987 ◽

Vol 19 (5-6) ◽

pp. 939-951 ◽

Cited By ~ 3

Author(s):

Clifton F. Warren ◽

R. Gehr

Keyword(s):

Adsorption Isotherm ◽

Total Nitrogen ◽

Kraft Pulp ◽

Detection System ◽

Cationic Polyelectrolyte ◽

Chemiluminescence Detection ◽

Pulp Fibers ◽

Paper Manufacturing ◽

Bleached Kraft Pulp ◽

Receiving Water

The adsorption and desorption behaviour of a cationic polyelectrolyte contacted with wood pulp fibers was determined by total nitrogen analysis using a pyrolysis/chemiluminescence detection system. Dialysed polymer generated an adsorption isotherm of higher affinity than did non-dialysed polymer. Capacity adsorption was maximized at pH 7, but decreased in the presence of alum depending on the dosage. Desorption of non-dialysed polymer was caused by changes in pH above or below 7.0 as well as by addition of alum. However for the alum doses typically encountered in paper manufacturing, significant desorption is unlikely. Nevertheless, the contaminants in non-dialysed polymers do hinder adsorption, and effluents from those processes using both alum and polymer may contain quantities of unadsorbed or desorbed polyelectrolytes which could be damaging to receiving water bodies.

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Durability of cementitious materials reinforced with various Kraft pulp fibers

Construction and Building Materials ◽

10.1016/j.conbuildmat.2018.10.139 ◽

2018 ◽

Vol 191 ◽

pp. 1191-1200 ◽

Cited By ~ 6

Author(s):

Emad Booya ◽

Hossein Ghaednia ◽

Sreekanta Das ◽

Harshad Pande

Keyword(s):

Kraft Pulp ◽

Cementitious Materials ◽

Pulp Fibers

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New technology for developing a lightweight refiner plate for hardwood kraft pulp fibers

BioResources ◽

10.15376/biores.15.4.9128-9142 ◽

2020 ◽

Vol 15 (4) ◽

pp. 9128-9142

Author(s):

Byeong-Geol Min ◽

Ji-Young Lee ◽

Chul-Hwan Kim ◽

See-Han Park ◽

Min-Seok Lee ◽

...

Keyword(s):

Stainless Steel ◽

Fiber Length ◽

Kraft Pulp ◽

New Technology ◽

Strength Properties ◽

Pulp Fibers ◽

Low Intensity ◽

Novel Technology ◽

Draft Angle ◽

Reducing Energy

Sand casting makes it difficult to manufacture a fine bar plate for low intensity refining. This study introduced a novel technology for manufacturing lightweight fine bar plates and compared the effects to traditional bar plates. The lightweight fine bar plate base was manufactured using a lightweight aluminum alloy and stainless-steel. Because the bars were inserted into the plate vertically without the draft angle, the stock throughput was improved by approximately 27% compared to the sand-casted bar plates. Additionally, the lightweight fine bar plate maximized internal and external fibrillation while minimizing fiber length loss. In conclusion, the lightweight fine bar plate was shown to be more effective in improving the strength properties of paper and reducing energy consumption.

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Xylanase-Induced Liberation of Negatively Charged Species and Their Effect on Colloidal Interactions and the Retention of Bleached Kraft Pulp Fibers

BioResources ◽

10.15376/biores.10.3.5460-5475 ◽

2015 ◽

Vol 10 (3) ◽

Author(s):

Katja Eliisa Lyytikäinen ◽

Kaj Backfolk

Keyword(s):

Kraft Pulp ◽

Pulp Fibers ◽

Charged Species ◽

Colloidal Interactions ◽

Bleached Kraft Pulp

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1,2,3,4-Butanetetracarboxylic Acid Cross-Linked Softwood Kraft Pulp Fibers for Use in Fluff Pulp Applications

Journal of Engineered Fibers and Fabrics ◽

10.1177/155892501400900317 ◽

2014 ◽

Vol 9 (3) ◽

pp. 155892501400900

Author(s):

Kristoffer Lund ◽

Harald Brelid

Keyword(s):

Kraft Pulp ◽

Cross Linking ◽

Hydroxyl Groups ◽

Pulp Fibers ◽

Fiber Networks ◽

Polycarboxylic Acids ◽

Fiber Wall ◽

Softwood Kraft Pulp ◽

Cross Linker ◽

Butanetetracarboxylic Acid

Cross-linked fluff pulp fibers for use in, for example, acquisition layers in absorption products can be found in the patent literature. Cross-linking improves properties such as the wet resilience of fluff pulp fiber networks. Among the more commonly seen cross-linkers are polycarboxylic acids, such as 1,2,3,4-butanetetracarboxylic acid (BTCA). These acids form ester bonds with the hydroxyl groups in the fiber wall. In this study, softwood kraft pulp fibers were cross-linked with BTCA. The swelling behavior of the fibers and properties related to acquisition in absorption products were studied. It was found that the water retention value (WRV) decreased as a consequence of the introduced cross-linker. After deprotonization of a large part of the introduced carboxylic acids, the WRV increased, but the cross-linker was still able to limit significant swelling of the fiber wall. The wet bulk under load of fiber networks, composed of cross-linked fibers, generally increased with a decrease in WRV. Furthermore, it was found that the property development obtained after a cross-linking reaction with BTCA may be predicted by introducing a relative reaction intensity, RIrel, that takes into account both time and temperature in the curing step. This shows that the time and temperature in the curing step are interchangeable.

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Alkali Extraction of Kraft Pulp Fibers: Influence on Fiber and Fluff Pulp Properties

Journal of Engineered Fibers and Fabrics ◽

10.1177/155892501200700206 ◽

2012 ◽

Vol 7 (2) ◽

pp. 155892501200700 ◽

Cited By ~ 3

Author(s):

Kristoffer Lund ◽

Karin Sjöström ◽

Harald Brelid

Keyword(s):

Kraft Pulp ◽

Pulp Fibers ◽

Fiber Network ◽

Alkali Extraction ◽

Flexible Fiber ◽

Softwood Pulp ◽

Softwood Kraft Pulp ◽

Patent Literature ◽

Network Strength ◽

Birch Kraft Pulp

The importance of hemicelluloses for the papermaking properties of pulp fibers is well documented. In the patent literature, it can be seen that there is also an interest in this type of modification of pulp fibers for use in absorption products. In this study, a Scandinavian softwood kraft pulp and a birch kraft pulp were alkali extracted at 3 different concentrations of NaOH (2%, 4% and 8% NaOH in the suspension). The alkali extraction removed a large part of the hemicelluloses from the pulp fibers and decreased the content of the charged groups. After extraction, the pulps were dried in the form of sheets (approx. 600 g/m2). The alkali extracted pulp fibers exhibited a greater decrease in swelling when re-wetted than untreated pulp. A significant increase in the curl index after extraction with 4% and 8% NaOH was also noted. The tensile strength index of the formed sheets increased at the lowest concentration of NaOH and, at the higher concentrations, a decrease was observed. The pulp sheets were dry defibrated at different defibration intensities and the performance of the resulting pulps in fluff pulp applications was studied. The air-laid fiber networks of softwood pulp fibers showed higher network strength than the networks of birch pulps. The birch pulp extracted at the highest alkali level tended to give the highest network strength. The results from the network strength tests also indicated that the increased curl of the fibers from the softwood pulp extracted at the highest alkali level rendered a more flexible fiber network. In water absorption tests, the alkali treated softwood fibers tended to give networks with a somewhat enhanced water holding capacity under pressure.

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