Dissolution of Various Cellulosic Materials and Effect of Regenerated Cellulose on Mechanical Properties of Paper

2019 ◽  
Vol 800 ◽  
pp. 138-144
Author(s):  
Velta Fridrihsone ◽  
Juris Zoldners ◽  
Marite Skute ◽  
Uldis Grinfelds ◽  
Inese Filipova ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Kraft Pulp ◽  
Degree Of Polymerization ◽  
Regenerated Cellulose ◽  
Cellulose Dissolution ◽  
Paper Sheet ◽  
Cellulose Fibres ◽  
Cellulosic Materials ◽  
Tissue Paper ◽  
Paper Filter

Recycling of paper materials or other type of cellulose fibres is important regarding saving nature resources and environmental protection. Cellulose dissolution and regenerating from various materials is one of recycling possibilities. Cellulose dissolution by NaOH/urea system has a great potential due to the use of harmless reagents, and at the same time is challenging due to the forming of gel-like substances, when cellulose has degree of polymerization more than 1000. It was found that microcrystalline cellulose and cotton cellulose were dissolved in NaOH/urea, but tissue paper, filter paper and waste paper were not dissolved completely. Additives of Kraft pulp and pulp waste dissolved and regenerated from NaOH/urea and cupriethylendiamine (CuETD) in amount 0-30% from paper composition increased mechanical properties of paper sheet. CuETD additive was more effective than NaOH/urea additive, however latter has potential for further research as environmentally friendlier.

Mechanical Properties of Regenerated Cellulose Fibres for Composites

2006 ◽  
Vol 244 (1) ◽  
pp. 119-125 ◽  
Author(s):  
Ramesh-Babu Adusumali ◽  
Moritz Reifferscheid ◽  
Hedda Weber ◽  
Thomas Roeder ◽  
Herbert Sixta ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Regenerated Cellulose ◽  
Cellulose Fibres ◽  
Regenerated Cellulose Fibres

Fabrication and comparative evaluation of regenerated cellulose films using pulp fines and pith from corn stalk in DMAc/LiCl solvent system

BioResources ◽  
2019 ◽  
Vol 14 (3) ◽  
pp. 6421-6432
Author(s):  
Heng Zhang ◽  
Xiaoning Tang ◽  
Xin Gao ◽  
Keli Chen
Keyword(s):  
Mechanical Properties ◽  
Ionic Liquid ◽  
Comparative Evaluation ◽  
Solvent System ◽  
Regenerated Cellulose ◽  
Corn Stalk ◽  
Small Particles ◽  
Cellulosic Materials ◽  
Cellulose Films ◽  
Regenerated Cellulose Films

Cellulose of corn stalk pulp fines and stalk pith were dissolved in an ionic liquid solvent system (DMAc/LiCl) and then regenerated to form films. The mechanical properties and Tmax of pulp fines/regenerated cellulose (RC) films were higher than that of the corresponding films from stalk pith. As the ratio of small particles was high in the pulp fines, the elongation at breakage of their RC films also increased to 12.9%. Thus, pulp fines were suitable for prepared regenerated cellulosic materials.

The physical and mechanical properties of high-modulus regenerated cellulose fibres

1972 ◽  
Vol 3 (3) ◽  
pp. 296-299
Author(s):  
V. O. Gorbacheva ◽  
N. N. Zavyalova ◽  
V. I. Maiboroda ◽  
L. P. Milkova ◽  
Z. S. Bunareva ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Regenerated Cellulose ◽  
High Modulus ◽  
Cellulose Fibres ◽  
Regenerated Cellulose Fibres

Bioactive cellulose fibres with silver nanoparticles

e-Polymers ◽  
2007 ◽  
Vol 7 (1) ◽  
Author(s):  
Piotr Kulpinski
Keyword(s):  
Mechanical Properties ◽  
Antibacterial Properties ◽  
Chemical Properties ◽  
Cellulose Dissolution ◽  
Silver Particles ◽  
Sem Images ◽  
Cellulose Fibres ◽  
Specific Chemical ◽  
E Coli

AbstractCellulose fibres were prepared from N-methylmorpholine-N-oxide (NMMO) as a direct solvent. The specific chemical properties of NMMO allow in-situ silver particles to be generated during the process of cellulose dissolution. The fibres obtained contained 0.005% (50 ppm) to 3% w/w of silver. The SEM images showed that the silver particles size is in the range between 30 and 330 nm. The antibacterial properties of the cellulose fibres obtained showed their high bioactivity against E. coli and S. aureus bacteria. The mechanical properties, the size of silver crystallites and SEM images of the fibres obtained were examined.

Research on Mechanical Properties of Several New Regenerated Cellulose Fibers

2011 ◽  
Vol 332-334 ◽  
pp. 489-495 ◽  
Author(s):  
Rong Zhou ◽  
Ming Xia Yang
Keyword(s):  
Mechanical Properties ◽  
Phase Change Materials ◽  
Cellulose Fiber ◽  
Cellulose Fibers ◽  
Regenerated Cellulose ◽  
Pulp Fiber ◽  
Pulp Fibers ◽  
Bast Fiber ◽  
Bamboo Pulp ◽  
Lyocell Fiber

Regenerated cellulose fiber is the most widely-used and most variety of cellulose fiber. Five categories and ten kinds of fibers such as lyocell fiber, modal fiber, bamboo pulp fiber, sheng-bast fiber, Outlast viscose fiber were chosen as the research object. The strength property and elasticity of fibers in dry and wet state were tested and analysis. The comprehensive performances of fabrics were studied and mechanical properties of the fibers were listed in the order from good to bad by grey clustering analysis. The results show lyocell G100 and lyocell LF have better comprehensive mechanical properties ,while other new regenerated cellulose fibers’ comprehensive mechanical properties are general. Among these fibers modal fiber’s comprehensive mechanical properties are slightly better than sheng-bast fibers’ and bamboo pulp fibers’. Modal fiber, sheng-bast fiber and Bamboo pulp fiber have no significantly poor single parameter and all of them have better comprehensive mechanical properties than various viscose fibers. Outlast viscose in which has been added phase change materials sensitive to temperature by Microcapsule techniques fundamentally keeps similar comprehensive mechanical properties with other regenerated cellulose fibers,but its properties decline slightly .

Rice Husks - Structure, Composition and Possibility of Use them at Surface Treatment

2016 ◽  
Vol 844 ◽  
pp. 153-156 ◽  
Author(s):  
Mateusz Fijalkowski ◽  
Kinga Adach ◽  
Aleš Petráň ◽  
Dora Kroisová
Keyword(s):  
Mechanical Properties ◽  
Silicon Dioxide ◽  
Epoxy Resin ◽  
Mechanical Stability ◽  
Rice Husks ◽  
Cellulose Fibres ◽  
Plant Parts ◽  
Sodium Magnesium ◽  
Excellent Adhesion ◽  
Individual Nanoparticles

Rice husks (RH) are characterized by a high content of silicon dioxide up to 23 wt. %. Silica in the form of nanoparticles creates surface layers formed in various plant parts which ensure protective properties and mechanical stability. These nanoparticles with a dimension in the range of tens of nanometers, are formed during biochemical processes and photosynthesis. Individual nanoparticles are interconnected between themselves and between layers with organic phase via cellulose fibres. Accompanying ions mainly potassium, calcium, sodium, magnesium and aluminium extremely important for plant growth have also been identified in rice husks. In this research paper we investigated mechanical properties of composite epoxy resin material, which was composed of ChS Epoxy 520 filled with silica obtained from rice husks. Nanoparticles of silicon dioxide with the size in dozen of nanometers were prepared by calcination of raw plant parts. We found that the 0.1 phr of filling (0.01 g of filler + 10 g of epoxy) demonstrated a significant increase of wear resistance and decrease of coefficient of friction. An excellent adhesion between epoxy resin and silica nanoparticles was also observed. The silicon dioxide in epoxy resin plays the role of the hard phase, which transfers part of the load and protects the surface of polymer against wear. The presence of this filler does not change the mechanical properties of the original resin.

Mild enzymatic treatment of bleached pulp for tissue production

BioResources ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. 4221-4236
Author(s):  
Magdalena Kmiotek ◽  
Katarzyna Dybka-Stępień ◽  
Anna Karmazyn
Keyword(s):  
Treatment Time ◽  
Morphological Characteristics ◽  
Enzyme Concentration ◽  
Degree Of Polymerization ◽  
Enzymatic Treatment ◽  
Fiber Structure ◽  
Tissue Paper ◽  
Fiber Properties ◽  
Bleached Pulp ◽  
Tissue Production

Effects of cellulase enzymatic treatment followed by mechanical beating were evaluated relative to the properties of cellulase-derived tissue pulps and handsheets. When different cellulase concentrations (0.0012 FPU/g, 0.0018 FPU/g, and 0.0024 FPU/g) of oven dried pulp (a 65/35 w/w ratio of beech to eucalyptus) were used for tissue production, a slight deterioration of the morphological characteristics was observed. Thus, a possibility of controlling the changes in the degree of polymerization of cellulose, as well as the fiber properties (in particular the length and coarseness) appeared. With an increased treatment time and enzyme concentration, these effects increased. The enzyme activity did not affect the apparent density of the paper, but the porosity drastically increased. The zero-span strength of the enzymatically treated pulps decreased with an increase in treatment time and amount of cellulase. However, mechanical beating improved the bonding between the cellulase fibers, which helped prevent the eventual decrease in mechanical properties of the handsheets. With the use of cellulase, the proposed moderate changes to fiber structure were achieved, giving the possibility of predicting and controlling the properties of tissue paper.

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