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cellulose degradation in pulp fibers studied as changes in

cellulose degradation in pulp fibers studied as …

Cellulose degradation in pulp fibers studied as …

Cellulose degradation in pulp fibers studied as changes in molar mass distributions Rickard Berggren, Royal Institute of Technology, Department of Fibre and Polymer

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cellulose degradation in pulp fibers studied as changes …

Cellulose degradation in pulp fibers studied as changes …

Keywords: cellulose. size-exclusion chromatography (SEC) of wood polymers dissolved in lithium chloride/N. and hence molar masses.Cellulose degradation in pulp fibers studied as changes in molar mass distributions Rickard Berggren.

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cellulose degradation in pulp fibers studied as changes …

Cellulose degradation in pulp fibers studied as changes …

Abstract. In this thesis, size-exclusion chromatography (SEC) of woodpolymers dissolved in lithium chloride/N,N-dimethylacetamide(LiCl/DMAc) has been used to characterize the molar massdistributions (MMD) of wood polymers in pulp fibers afterchemical degradation.

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influencing factors for alkaline degradation of cellulose ...

Influencing factors for alkaline degradation of cellulose ...

Influencing Factors for Alkaline Degradation of Cellulose. Qun Li, a, * Aijiao Wang, a Wenhui Ding, b and Yujia Zhang c. Different factors that influence the alkaline degradation of cellulose in the pulping process were considered in this study. The factors were the reaction temperature, reaction time, dosage of NaOH, and metal ions.

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studies on nano cellulose century fiber composites ...

Studies on Nano Cellulose Century Fiber Composites ...

Nano cellulose composites are used for advanced applications for structural parts and electronic components. Biocompatible water soluble cellulose composites are used in medical applications as well. Nano cellulose fibers are extracted through various chemical and mechanical treatments to separate the cellulose and to further refine it.

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urn:nbn:se:kth:diva-3499 : cellulose degradation in pulp ...

urn:nbn:se:kth:diva-3499 : Cellulose degradation in pulp ...

Severe alkaline degradation of birch and Norway spruce woodchips was studied both by varying the pulping time and byvarying the initial alkali concentration. Differences werefound in the MMD of the two fiber types, and the alkalinedegradation was found to affect polymers in the entire MMD.

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structural changes in cellulose during …

Structural Changes In Cellulose During …

analyzing the structural changes that occur in pulp fibers during papermaking, particu- larly in the drying stage. These changes are responsible for the degradation …

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modification of spruce sulphite pulp …

MODIFICATION OF SPRUCE SULPHITE PULP …

comprehensive analysis of fiber degradation, α-cellulose content was determined to assess the enzymatic influence on the treated fiber. The α-cellulose content analysis is employed to characterize the relatively high molecular weight cellulose component and, therefore, can be used to assess the EG action on fibers.

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production and evaluation of …

PRODUCTION AND EVALUATION OF …

Changes in the matrix polymers and pulp fibers were analyzed using gel permeation chromatography (GPC) ... The degradation of PLA and PHB observed during the heating process is thought ... cellulose fibers and derivatives. The study centers on the use of natural fibers consisting of bleached

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the effect of hemicelluloses on the …

THE EFFECT OF HEMICELLULOSES ON THE …

Cotton fibers are composed principally of cellulose while wood pulp fibers contain four chemical groups: cellulose, hemicellulose, lignin, and a miscel- laneous group which includes pectinaceous material, inorganic compounds, etc.

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influencing factors for alkaline degradation of cellulose ...

Influencing factors for alkaline degradation of cellulose ...

The major change of cellulosic fibers in thermal degradation is to enhance the reactivity of the crystalline cellulose through decreasing the DP and increasing the accessibility of cellulose (Liu et al. 2012).

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ultrastructural aspects of pu lp fibers as studied by ...

Ultrastructural Aspects of Pu lp Fibers as Studied by ...

pulp fibers is a promising line of research for obtaining information at the nano-scale level. Several such techniques have in recent years been explored and refined for application in this field within the framework of the Wood Ultrastructure Research Center (WURC), a

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modification of spruce sulphite pulp by …

MODIFICATION OF SPRUCE SULPHITE PULP BY …

comprehensive analysis of fiber degradation, α-cellulose content was determined to assess the enzymatic influence on the treated fiber. The α-cellulose content analysis is employed to characterize the relatively high molecular weight cellulose component and, therefore, can be used to assess the EG action on fibers.

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indirect evidence of supramolecular changes within ...

Indirect evidence of supramolecular changes within ...

Upon drying a pulp fiber, the water is withdrawn from between the cellulose microfibrils and, if exposed to water again, the swelling is not restored to the original level. This irreversible shrinkage of pulp fibers is called hornification, a term coined by Jayme ( 1944 ).

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structural changes in cellulose during …

Structural Changes In Cellulose During …

analyzing the structural changes that occur in pulp fibers during papermaking, particu- larly in the drying stage. These changes are responsible for the degradation of papermak-

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the effect of mechanical treatment on …

THE EFFECT OF MECHANICAL TREATMENT ON …

studies have shown the relationship between cellulose degradation and fiber strength. In earlier studies /22, 23/ the authors showed that when pulp was mechanically treated at high temperature and pH, the fiber strength decreased by 20%, measured as zero-

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cellulose degradation publications | pubfacts

cellulose degradation Publications | PubFacts

In this study, the effect of enzymatic treatment on filter paper and wood pulp fibers, and CNCs generated via subsequent acid hydrolysis were assessed. Characterization was performed using a pulp quality monitoring system, scanning and transmission electron microscopies, dynamic light scattering, X-ray diffraction, and thermogravimetric analysis.

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effect of acid hydrolysis conditions on the degradation ...

Effect of acid hydrolysis conditions on the degradation ...

During hydrolysis reactions for cellulose nanofibrils (CNFs) obtaining, for example, formations of carbonyl groups in cellulose chains, can be responsible for the cellulose degradation [8]. Thermogravimetric analysis is the most common technique used to study thermal stability of cellulose fibers and nanofibers.

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properties of polymer composites with cellulose …

Properties of Polymer Composites with Cellulose …

cellulose fibers are often contradictory because of many factors controlling the process like filler size and content, interface adhesion, fiber aspect ratio and orientation, fiber dispersion in the matrix and stress transfer efficiency through the interface (Dufresne et al., 2003).

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a xylanase-aided enzymatic pretreatment facilitates ...

A xylanase-aided enzymatic pretreatment facilitates ...

Since among all the xylanase preparations the combination of EG and Xyn2 showed the greatest promise to the bleached hardwood Kraft pulp (BHK) (increased cellulose accessibility with limited cellulose degradation, Fig. 1 and Table 3), we next assessed the effects of EG and its combination with Xyn2 on the bleached softwood Kraft pulp (BSK).

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peer-reviewed article bioresources

PEER-REVIEWED ARTICLE bioresources

The fiber surface has an important impact on the difference in xylan uptake between pulp and regenerated fibers. To use xylan as a blend for viscose fibers and to avoid its degradation, it was added during the dissolving step right after alkalization and xanthation in viscose preparation (Schild and Liftinger 2014).

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(pdf) lignin inhibits autoxidative degradation of …

(PDF) Lignin inhibits autoxidative degradation of …

Lignin inhibits autoxidative degradation of cellulose. ... To study the degradation of the cellulose, size exclusion chromatography was used. ... Degradation of pulp fibers …

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cellulose fiber - wikipedia

Cellulose fiber - Wikipedia

Cellulose fibers (/ ˈ s ɛ lj ʊ l oʊ s, -l oʊ z /), spelled as "fibre" in most of the english speaking world, are fibers made with ethers or esters of cellulose, which can be obtained from the bark, wood or leaves of plants, or from other plant-based material.

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changes of cellulose accessibility to cellulase due to ...

Changes of cellulose accessibility to cellulase due to ...

The drying-induced hornification decreased the CAC from 21.6 m 2 /g (ND pulp), to 6.9 m 2 /g (AD pulp), and to 4.3 m 2 /g (OD pulp), thus retarding the enzyme adsorption onto cellulose fibers, which in turn, decreased the enzyme treatment efficiency of the dissolving pulp for its viscosity decrease.

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