Relevant bibliographies by topics / Cellulose papers / Dissertations / Theses
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Dissertations / Theses on the topic 'Cellulose papers'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 February 2022

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1

Bardet, Raphael. "Nanocelluloses as potential materials for specialty papers." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENI091/document.

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L’originalité de ce travail est d’étudier la contribution des nanocelluloses pour lafonctionnalisation des papiers spéciaux. Il y a deux types de nanocellulose, les nanocristauxde cellulose (NCCs) et les microfibrilles de cellulose (MFCs). Il en résulte des propriétésdifférentes à l’état de suspension et à l’état sec. La propriété des MFCs de former un réseaud’enchevêtrement est utilisée pour la dispersion des particules. L’auto-assemblage des NCCsa permis d’élaborer des films iridescents. Ces films ont été considérés comme couchesmodèles puis ensuite mis en oeuvre dans le procédé de fabricati
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2

Lundström, Lisa. "Polyelectrolyte multilayers of cationic and anionic starch and their use for improving the strength of papers made from mechanical pulps." Licentiate thesis, KTH, Fibre and Polymer Technology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10537.

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<p>Graphic paper is experiencing severe competition from other materials and, most of all, from other media. This means there is a great need to improve paper quality while reducing raw material and production costs. Polyelectrolyte multilayer (PEM) treatment (i.e., consecutively adding cationic and anionic polyelectrolytes to the charged surface of wood fibres and fines, to form layers of these polyelectrolytes on the fibres/fines) has in recent years been found to offer great potential both to introduce new properties and to improve the mechanical properties of papers made of the treated fib
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3

Thieulin, Coralie. "Caractérisation des mécanismes d’endommagement du stratum corneum induit par le frottement répété de papiers en cellulose." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEE001/document.

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Loin d’être une simple enveloppe pour notre corps, la peau constitue une frontière mécanique, physique, chimique et immunologique d’une remarquable efficacité. Cette fonction est en grande partie assurée par la couche la plus superficielle de la peau, appelée stratum corneum. Néanmoins, dans la vie de tous les jours, le frottement répété de la peau contre des surfaces textiles peut engendrer l’apparition de sensations d’inconfort et d’irritation cutanée. En particulier, en période de rhume, les frottements à répétitions des mouchoirs en papier sur le nez fragilisent la peau et peuvent provoque
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4

Reverdy, Charlène. "Industrial applications of functional nanocelluloses." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAI080.

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Ce projet s’est focalisé sur l’ajout de nouvelles propriétés à des papiers grâce à l’utilisation de nanocelluloses fonctionnelles. Ces nanocelluloses sont des nanoparticules extraites du bois qui peuvent être divisées en deux catégories : les nanofibrilles de cellulose (CNFs) et les nanocristaux de cellulose (CNCs). Ce travail s’est essentiellement penché sur l’utilisation des CNFs. Leur réactivité chimique a été utilisée afin de les fonctionnaliser avec des organotrialkoxysilanes. C’est aussi leur fort enchevêtrement ainsi que la grande viscosité de ces CNFs en suspension qui ont été utilisés
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5

Guers, Cyril. "Optimisation des matériaux cellulosiques pour des applications en radiofréquences et térahertz." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAT044.

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Ce travail de thèse se concentre sur l’optimisation des matériaux cellulosiques (papiers, carton et matériaux à base de cellulose). Nous cherchons à améliorer ces matériaux dans le cadre d’applications hautes fréquences : radiofréquences et térahertz. Actuellement les propriétés diélectriques des matériaux cellulosiques, et notamment leurs pertes diélectriques, sont très élevées. Cela se traduit par une limitation importante de l’efficacité et des rendements des applications dans notre domaine d’étude. Dans ce travail nous commençons par étudier individuellement les propriétés et les paramètre
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6

de, Mourgues Marius. "Composite Cellulose Nanofibrils Filaments." Thesis, KTH, Materialvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-277919.

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Biodegradable polymers are emerging as a new solution to satisfy the increasing demand of greenenvironmentally friendly material. At the same time, the interest for lighter and stronger structures never stops growing. In this paper, we report the production steps to achieve cellulose nanofibrils (CNF) composite filaments via a new green synthesis route known as wet spinning. This new technique avoids the traditional harmful viscose process and produces biodegradable CNF filaments with interesting mechanical properties. This approach is then applied to produce never seen before composite CNF fi
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7

Hu, Gang. "Adsorpton and Activity of Cellulase Enzymes on Various of Cellulose Substrates." NCSU, 2009. http://www.lib.ncsu.edu/theses/available/etd-04222009-234535/.

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The objective of this research is to understand the interfacial behavior of cellulase enzymes and its effect on cellulose hydrolysis. This research began with an in-situ monitoring of cellulose hydrolysis using a piezoelectric based quartz crystal microbalance. The time-course kinetics was modeled using a dose response model. The adsorption indicated by the frequency drop followed a Langmuir model as cellulase enzyme increased. Another important part of this research is the development of a new cellulase activity assay based on the piezoelectric technique. This assay provides an easier and mor
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8

Gimåker, Magnus. "Influence of adsorbed polyelectrolytes and adsorption conditions on creep properties of paper sheets made from unbleached kraft pulp." Licentiate thesis, KTH, Fibre and Polymer Technology, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4553.

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<p>Papper uppvisar betydande tidsberoende mekaniska egenskaper som krypning och spänningsrelaxation. Det är känt att krypningen hos pappret påverkar till exempel en wellpapplådas förmåga att bära last under lång tid. En möjlighet att tillverka papper som kryper långsammare är därför önskvärd. Polyelektrolyter används ofta för att öka styrkan hos papper, och skulle kanske också kunna användas till att minska papprets krypning. Inverkan av polymera additiv på pappers krypegenskaper är emellertid knapphändigt beskrivet i litteraturen. Existerande studier har visat att polymera additiv inte påverk
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9

Svedberg, Anna. "Valuation of retention/formation relationships using a laboratory piot-paper machine." Licentiate thesis, KTH, Fibre and Polymer Technology, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4517.

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<p>The interdependency between filler retention and paper formation is well-known, where a high retention is accompanied by impaired formation. A challenge for today’s papermakers is to increase the competitiveness for uncoated and coated fine paper, by improving the formation at the same level of retention.</p><p>Over the years, the use and the demands of retention aids have increased as a consequence of a higher system closure, increased machine speeds and increased filler content. The knowledge of whether some retention aid systems are more or less detrimental to paper formation than other
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10

Tufvesson, Helena. "The mechanisms of edge wicking in retortable paperboard." Licentiate thesis, Stockholm, Division of Fibre Technology, Department of Fibre and Polymer Technology, Royal Institute of Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4155.

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11

Aulin, Christian. "Preparation, characterisation and wetting of fluorinated cellulose surfaces." Licentiate thesis, Stockholm : Royal Institute of Technology. Department of Fibre and Polymer Technology, Division of Fibre Technology, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4587.

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12

Svensson, Anna. "Nanocomposites made from nanoporous cellulose fibre." Licentiate thesis, KTH, Fiberteknologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-103342.

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This thesis explores how to use the dry nanoporous structure of cellulosic fibres in new types of composite materials. A large effort was also given on how to correctly characterize the structure of fibres where the wet structure has been preserved also in the dry state. Delignified wood fibres have an open fibrillar structure in their water-swollen state. In the present work, this open fibrillar structure was preserved in the dry state by performing a liquid exchange procedure and the samples were thereafter carefully dried with Ar(g). The samples of never-dried TEMPO-oxidized dissolving pulp
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13

Carlsson, Viktoria. "Pulp compositions and their influence on the production of dialcohol cellulose." Thesis, Karlstads universitet, Institutionen för ingenjörsvetenskap och fysik (from 2013), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-78704.

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The characteristics of products made from pulp can be modified through different methods. If the pulp is refined either laboratory or industrially, the fibres in the pulp become more flexible and therefore creates stronger bonds to each other, which results in a final product with a higher strength. The refining process also causes the formation of small fibre pieces that are called fines, which also contribute to the increased strength. The major component in pulp is cellulose, which can be chemically modified to materials with changed properties. Periodate oxidation of cellulose results in d
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14

Danielsson, Sverker. "Xylan Reactions and their Influence on Paper Sheet Properties." Licentiate thesis, KTH, Fibre and Polymer Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3850.

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<p>Xylan is the main hemicellulose in birch, eucalyptus, and most other hardwood species. During kraft pulping a series of chemical reactions and physical processes involving xylan take place. The processes studied in this thesis are the following: dissolution, degradation, redeposition onto the fibres, side group conversion, and cleavage of side groups off the xylan back bone. The side group in native xylan consists of methylglucuronic acid, which is mainly converted into hexenuronic acid during kraft cooking. Hexenuronic acid affect the pulp in terms of increased brightness reversion and det
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15

Ankerfors, Caroline. "Polyelectrolyte complexes : their preparation, adsorption behaviour and effect on paper properties." Licentiate thesis, KTH, Fibre and Polymer Technology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4833.

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<p>In this work, the formation of polyelectrolyte complexes (PECs) has been studied using a jet mixing method not previously used for mixing polyelectrolytes. The PECs were formed from two weak polyelectrolytes, i.e., polyacrylic acid (PAA) and polyallylamine hydrochloride (PAH), with different mixing times, and the results were compared with those for PECs formed using the conventional polyelectrolyte titration method.</p><p> </p><p>The adsorption behaviour of the formed PECs on silicon oxide substrates and pulp fibres was analysed, and the results were compared with those for polyelectrolyte
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16

Fivaz, Erika. "Evaluation of joint formation on cellulosic surfaces." Thesis, KTH, Materialvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-277912.

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Environmental issues are more and more present in our societies. Pollution engendered by plastic waste have drastically increased these past decades, causing several threats to the ecosystem. Therefore, the need of new biodegradable plastics to replace the actual petroleum-based ones is urgent. Cellulose could be a potential substitute since it is a biopolymer, abundant on Earth. However its properties have to be enhanced to be competitive towards actual plastics. The aim of the project is therefore to get a better understanding of cellulose-cellulose interactions. It focuses on the adhesion b
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17

Larsson, Per A. "Dimensional Stability of Paper : Influence of Fibre-Fibre Joints and Fibre Wall Oxidation." Licentiate thesis, KTH, Fiberteknologi, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4635.

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Papper är ett mycket mångsidigt material. Trots detta finns det ett flertal egenskaper som begränsar papperets användbarhet. Ett av de större problemen med cellulosa- och lignocellulosafibrer är att de sänker sin fria energi genom att sorbera vatten, och denna sorption förändrar papperets dimensioner. Detta fenomen kallas vanligtvis för bristfällig dimensionsstabilitet och uppträder i form av registerfel vid flerfärgstryck eller som krullning, buckling och vågiga papperskanter vid utskrift, kopiering och lagring, eller med en vidare definition som förkortad livslängd hos lådor på grund av meka
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18

Larsson, Per. "Dimensional Stability of Paper Influence of Fibre-Fibre Joints and Fibre Wall Oxidation." Licentiate thesis, KTH, Fibre and Polymer Technology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4635.

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<p>Papper är ett mycket mångsidigt material. Trots detta finns det ett flertal egenskaper som begränsar papperets användbarhet. Ett av de större problemen med cellulosa- och lignocellulosafibrer är att de sänker sin fria energi genom att sorbera vatten, och denna sorption förändrar papperets dimensioner. Detta fenomen kallas vanligtvis för bristfällig dimensionsstabilitet och uppträder i form av registerfel vid flerfärgstryck eller som krullning, buckling och vågiga papperskanter vid utskrift, kopiering och lagring, eller med en vidare definition som förkortad livslängd hos lådor på grund av m
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19

Kerim, Kyzy Bermet. "Evaluation of cellulose nanocrystal alignment in oriented electrospun fibers." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-65856.

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Electrospinning is a fiber production method that has gained a special attention due to the simple setup and potential for the industry scale up to produce nanoregime polymer fibers. However, electrospun fibers have relatively poor mechanical properties, which could be improved by introducing reinforcing agents. Cellulose nanocrystals (CNCs) are a promising candidate for use as such fiber reinforcing phase due to nanoscale dimensions, excellent mechanical properties, abundance in nature, biocompatibility and renewability. The mechanical properties of reinforced fibers can be further improved b
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20

Brännvall, Elisabet. "Aspects on Strenght Delivery and Higher Utilisation of the Strength Potential of Kraft Pulp Fibres." Doctoral thesis, KTH, Träkemi och massateknologi, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4373.

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Studies on strength delivery and related fields have so far concentrated on finding the locations in the mill where fibres are damaged and what the damages consist of. However, fibres will invariably encounter mechanical stresses along the fibreline and in this thesis a new concept is introduced; the vulnerability of fibres to mechanical treatment. It is hypothesised that fibres with different properties have different abilities to withstand the mechanical forces they endure as they are discharged from the digester and transported through valves, pumps and various washing and bleaching equipme
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21

Almgren, Karin M. "Wood-fibre composites : Stress transfer and hygroexpansion." Doctoral thesis, KTH, Träkemi och massateknologi, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-12309.

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Wood fibres is a type of natural fibres suitable for composite applications. The abundance of wood in Swedish forests makes wood-fibre composites a new and interesting application for the Swedish pulp and paper industry. For large scale production of composites reinforced by wood fibres to be realized, the mechanical properties of the materials have to be optimized. Furthermore, the negative effects of moisture, such as softening, creep and degradation, have to be limited. A better understanding of how design parameters such as choice of fibres and matrix material, fibre modifications and fibr
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22

Olsson, Ann. "Suberin based polyesters." Licentiate thesis, KTH, Fibre and Polymer Technology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10528.

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<p>In the wish to replace oil-based chemicals and materials with such based on biodegradable and renewable resources, this work has been performed. In a biorefinary concept, waste birch bark from paper pulp mills and timber production has been evaluated as a potential source for polyesters. </p><p>In the present thesis investigations are made on synthesis of epoxy-functionalized polyesters from the birch outer bark aliphatic suberin ω-hydroxy fatty acid, <em>cis</em>-9,10-epoxy-18-hydroxyoctadecanoic acid. Studies of accessibility and reactivity of cellulose have been performed as a first step
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Lawoko, Martin. "Lignin polysaccharide networks in softwood and chemical pulps : characterisation, structure and reactivity." Doctoral thesis, Stockholm, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-458.

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Josefsson, Peter. "Biochemical modification of wood components." Licentiate thesis, Stockholm : Fibre and Polymer Technology, KTH, the Royal Institute of Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4171.

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25

Wilke, Caroline. "Fördröja åldrandet av elektrotekniskt papper genom kemikalietillsats : En studie av dicyandiamids påverkan." Thesis, Karlstads universitet, Fakulteten för teknik- och naturvetenskap, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-7357.

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Nordic Paper Åmotfors tillverkar elektrotekniskt papper som används till att isolera lindningarna i transformatorer. Det är viktigt att bibehålla papprets egenskaper under en mycket lång tid då en transformators livlängd är lång. Syftet med detta examensarbete var att undersöka huruvida tillsats av en kemikalie bestående av dicyandiamid kan fördröja åldrandet av de papper som Nordic Paper tillverkar. Förhoppningen var att deras papper därefter skulle klara de krav-parametrar som finns för papper som åldrats i olja. Kemikalien som användes var Cartafix® WE liquid. Försök utfördes där olika kemi
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26

Horvath, Andrew T. "Chemical Methods for Improving the Fracture Toughness of Paper." Doctoral thesis, KTH, Fiberteknologi, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4752.

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Paper is a network material composed of a great number of fibers that interact with each other through fiber joints. In order to make a clear statement regarding observed changes being made in paper, it is vital to determine the structural level of paper that is being affected by chemical modifications. Polyelectrolytes having a wide range in molecular properties have been synthesized to investigate the adsorption behavior of cationic polyelectrolytes to cellulosic fibers. The interaction with the porous cell wall of cellulosic fibers is governed by the molecular properties of the polyelectrol
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27

Konradsson, Rikard. "Produktionsökning i sileriet vid Rottneros Bruk." Thesis, Karlstad University, Faculty of Technology and Science, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-5716.

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Land, Cecilia. "Laboratory method for the study of moisture-induced waviness in paper." Licentiate thesis, Karlstad University, Division for Chemistry, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-6425.

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<p>Paper that is subjected to moisture undergoes dimensional changes. It expands during moistening and shrinks during drying. When the paper is under tension between rollers, the effects are complex since shrinkage and expansion are restricted in the width direction. Waves can then appear on the paper web. This can be a problem in heatset web offset printing. The problem is known as waviness or fluting. The printed papers exhibit a wavy shape, which is visually disturbing due to light reflections which create glossy streaks. The aim of the work described in this thesis was to develop a method
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Gustafsson, Emil. "Tailoring adhesion and wetting properties of cellulose fibers and model surfaces." Licentiate thesis, KTH, Fiberteknologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-91296.

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The layer-by-layer (LbL) technique was used to modify the surface of cellulose fibers by consecutive adsorption of poly(allylamine hydrochloride) (PAH) and poly(acrylic acid) (PAA) followed by a final adsorbed layer of anionic paraffin wax colloids. Paper hand sheets made from the modified fibers were found to be highly hydrophobic with a contact angle of 150°. In addition to the significantly increased hydrophobicity, the sheets showed improved mechanical properties, such as a higher tensile strength. Heat treatment of the prepared sheets further enhanced both the mechanical properties and th
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Sandberg, Birgersson Paulina. "Transparent paper: Evaluation of chemical modification routes to achieve self-fibrillating fibres." Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-281347.

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Transparenta papper tillverkade av cellulosa nanofibriller (CNF), visar stor potential att kunna ersätta petroleumbaserade plaster inom många användningsområden, till exempel för mat- och varuförpackningar. CNF, även känt som nanocellulosa, kombinerar viktiga cellulosaegenskaper, med unika egenskaper hos nanomaterial. Denna kombination av egenskaper möjliggör tillverkning av ett pappers-liknande material som uppvisar både utmärkta mekaniska egenskaper och hög transparens. Användningen av nanocellulosa är dock förknippad med diverse utmaningar, för att materialet ska kunna bli kommersiellt slag
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Desmaisons, Johanna. "Use of nanocellulose for security paper." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAI055.

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L’originalité de ce travail est d’étudier la contribution des nanocelluloses pour limiter deux défauts courant dans les papiers sécurités: le froissage et les “cornes”, où plis qui se manifestent dans les angles des papiers. Ces défauts sont principalement causés par une manipulation quotidienne de ces papiers à haute valeur ajoutée, et sont responsables d’une perte en qualité visuelle et mécanique ainsi que de troubles économiques. Les nanocellulose peuvent être divisées en deux différentes familles de matériaux : les nanofibrilles de celluloses (NFCs) et les nanocristaux de cellulose (NCCs).
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Kato, Kaoru Lisa. "Structural changes in thermally aged cellulose and paper." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624865.

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Montibon, Elson. "Preparation of Electroconductive Paper by Deposition of Conducting Polymer." Licentiate thesis, Karlstad University, Faculty of Technology and Science, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-4478.

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<p>The thesis describes an investigation into the interaction between the conducting polymer and cellulosic materials, and the preparation of electroconductive paper. The adsorption behavior of the conducting polymer onto cellulosic materials was characterized. Poly(3,4-ethylenedioxythiophene) doped with poly(4-styrene sulfonate) (PEDOT:PSS) was used as conducting polymer because of its attractive properties in terms of conductivity, water solubility, and environmental stability. The model substrate used for adsorption was microcrystalline cellulose (MCC). Various pH levels and salt concentrat
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Kröling, Henri [Verfasser]. "Paper as Reinforcement in Paper-Epoxy Composites and All-Cellulose Composites / Henri Kröling." Aachen : Shaker, 2018. http://d-nb.info/1161299386/34.

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Rixen, Alexandra. "Energieffektivisering i ett reningsverk för skogsindustriellt avloppsvatten genom förfällning av extraktivämnen." Thesis, Karlstads universitet, Fakulteten för teknik- och naturvetenskap, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-7342.

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Pulp- and papermills expend vast amounts of water in order to produce pulp, paper and cardboard. Hence, they alsocreate vast amounts of waste water which has to be cleaned before it can be released into the receiving body of water. Insuch a wastewater treatment plant, tremendous amounts of energy are expended by the aeration in the biologicalcleaning process. This aeration is necessary to supply the microorganisms that shall decompose organic material withoxygen, which they need for their metabolism. The transfer of oxygen from the gas phase to the liquid phase isprimarily inhibited by surface
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Illergård, Josefin. "Development of New Bacteria-Reducing Surfaces." Licentiate thesis, KTH, Fibre and Polymer Technology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10586.

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<p>In recent years, antibacterial surfaces have been a subject of increased interest. Especiallyinteresting are non-leaching, contact-active surfaces that physically disrupts the bacterialcell using immobilised cationic polymers. Thus the risks of bacterial resistance and discharge of hazardous biocides is minimised. The assembly of such surfaces is elaborate andusually involves organic solvents. Here, polyelectrolyte multilayers (PEM) are proposed as an effective surface modification method, with an overall goal of producing antibacterial cellulose fibres. The PEM process is based on physical
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Das, Satyajit. "Production de celluloses pures à partir de pâte à papier par un procédé propre au peroxyde d'hydrogène catalysé." Phd thesis, Université de Grenoble, 2012. http://tel.archives-ouvertes.fr/tel-00876881.

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L'objectif de ce travail est donc de développer un procédé industriel, propre, de production de cellulose pure à partir de pâte kraft non blanchie, basé sur la catalyse du peroxyde d'hydrogène et utilisant si nécessaire des traitements complémentaires sans chlore. A cet effet, deux approches sont adoptées : (i) délignification de pâte kraft avec du peroxyde d'hydrogène et (ii) purification de la pâte à la soude et ozone. La réaction du système cuivre-phénanthroline / peroxyde d'hydrogène avec un composé modèle de lignine non phénolique, l'alcool vératrylique a été étudié. L'effet du catalyseur
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Aulin, Christian. "Novel oil resistant cellulosic materials." Doctoral thesis, Stockholm : Kungliga Tekniska högskolan, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11494.

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Dassoler, Karine. "Farelo de trigo como matéria-prima para produção de papel." Universidade Estadual do Oeste do Paraná, 2017. http://tede.unioeste.br/handle/tede/3290.

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Submitted by Neusa Fagundes (neusa.fagundes@unioeste.br) on 2018-02-08T19:10:01Z No. of bitstreams: 1 Karine_Dassoler2017.pdf: 1003941 bytes, checksum: f29baeb8bacac3432cb09c39d7db0b18 (MD5)<br>Made available in DSpace on 2018-02-08T19:10:01Z (GMT). No. of bitstreams: 1 Karine_Dassoler2017.pdf: 1003941 bytes, checksum: f29baeb8bacac3432cb09c39d7db0b18 (MD5) Previous issue date: 2017-07-13<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>Paper is an extremely versatile material that, by possessing chemical, physical and mechanical unique properties, can have several a
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Ciofi, José Leandro. "Uma investigação do nível de sustentabilidade das companhias de papel e celulose e a influência das informações financeiras sobre a qualidade da divulgação socioambiental." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/96/96133/tde-11052010-151545/.

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O conceito de sustentabilidade tem sido discutido em âmbito mundial e influenciado de modo crescente as decisões de mercado nos mais diversos países. As nações, os governos, as corporações, os gestores e os cidadãos tiveram suas posturas e questionamentos ampliados sob os pontos de vista econômicos, sociais e ambientais. A propagação de uma geração verde não somente afetou questões ambientais como também transformou as informações de enfoque sustentável em importantes direcionadores ao mercado. Em meio a este cenário, as corporações dos mais diversos segmentos passaram a ter de criar mecanismo
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41

Modolo, Regina Célia Espinosa. "Valorization of solid wastes from cellulose and paper industry." Doctoral thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/13961.

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Doutoramento em Ciências e Engenharia do Ambiente<br>This thesis reports in detail studies of industrial solid wastes valorization as alternative raw materials. All tested wastes are classified as non-hazardous and are generated in the pulp and paper process, including primary sludge, dregs, grits, lime mud and bottom ash (this generated in a process that occurs in parallel to the production of cellulose, whose aim is the production of energy to supply the plant through the combustion of forest biomass in fluidized bed). A detailed general characterization was performed at each waste an
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Bengtsson, Andreas. "Carbon fibres from lignin-cellulose precursors." Licentiate thesis, KTH, Träkemi och massateknologi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-244756.

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It is in the nature of the human species to find solutions of complex technical problems and always strive for improvements. The development of new materials is not an exception. One of the many man-made materials is carbon fibre (CF). Its excellent mechanical properties and low density have made it attractive as the reinforcing agent in lightweight composites. However, the high price of CF originating from expensive production is currently limiting CF from wider utilisation, e.g. in the automotive sector.   The dominating raw material used in CF production is petroleum-based polyacrylonitrile
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43

Jansson, Johan. "Digester modelling for diagnostics and control." Doctoral thesis, Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-7547.

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This thesis will show the possibility for the development and use of an on-line model for application to continuous digesters for pulp production. The model is developed by using a program called Dymola (Dynamic Modeling Laboratory). What makes the Dymola software so well suited is that the program solves equations simultaneously. The model is a further development from the Purdue model [Bhartiya et al, 2003]. The main difference between this model and the Purdue model however, is the dynamics in the model. The dynamics are very important when you use the model for control purposes because the
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Wright, R. G. "Studies on the thermal degradation of celluloses and electrical insulating papers." Thesis, University of Salford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356193.

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Park, Sunkyu. "Drying Behavior of Cellulose Fibers Characterized by Thermal Analysis." NCSU, 2006. http://www.lib.ncsu.edu/theses/available/etd-04282006-140641/.

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The objective of this research is to understand the drying behavior of cellulose fibers characterized by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). A parameter termed ?hard-to-remove (HR) water content? was defined as the ratio of water mass to fiber mass at the transition between the constant and falling rate drying zones of an isothermal TGA experiment. The HR water content showed a linear relationship with water retention value. TGA and DSC were used to explain the linear relationship. During drying, free water was observed to evaporate first, followed by
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46

Ankerfors, Mikael. "Microfibrillated cellulose: Energy-efficient preparation techniques and applications in paper." Doctoral thesis, KTH, Fiberteknologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-159222.

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This work describes three alternative processes for producing microfibrillated cellulose (MFC; also referred to as cellulose nanofibrils, CNF) in which bleached pulp fibres are first pretreated and then homogenized using a high-pressure homogenizer. In one process, fibre cell wall delamination was facilitated by a combined enzymatic and mechanical pretreatment. In the two other processes, cell wall delamination was facilitated by pretreatments that introduced anionically charged groups into the fibre wall, by means of either a carboxymethylation reaction or irreversibly attaching carboxymethyl
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Abouzeid, Ragab. "Advanced cellulose composites, preparation and properties." Phd thesis, Université de Grenoble, 2012. http://tel.archives-ouvertes.fr/tel-00947624.

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L'accumulation de déchets agricoles tels que la bagasse et le développement d'alternatives aux polymères issus de la pétrochimie ont reçu une attention croissante au cours des deux dernières décennies, due à l'augmentation de la population et à la préoccupation croissante pour la préservation de l'environnement. Cette étude tente de résoudre ces problèmes à l'aide de deux approches principales.La première est liée à des composites à base de papier et de liant naturel et la seconde est associée à la préparation et à la caractérisation de dérivés cellulosiques présentant des propriétés cristaux
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Fast, Kyle Robert. "CHARACTERIZATION OF ELECTROPHORECTIC SEPARATIONS ON A CELLULOSE PAPER-MICROFLUIDIC CHIP." DigitalCommons@CalPoly, 2015. https://digitalcommons.calpoly.edu/theses/1483.

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The purpose of this thesis project is to demonstrate the ability to utilize electrophoresis in a cellulose paper microfluidic chip to manipulate charged particles. Materials were selected and a manufacturing protocol was created to successfully apply the electric field onto the paper chip. Experiments were performed to characterize the separation rates for charged, colorimetric dye, Orange G in the membrane as a function of an applied electric field, dye concentration, and distance traveled. The experiments confirmed that the electric field can be applied to the chip and particle separation ra
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Vieira, Melissa Gurgel Adeodato 1979. "Analise da secagem de polpa de celulose para a obtenção de papel reciclado tipo cartão." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/266275.

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Orientador: Sandra Cristina dos Santos Rocha<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Quimica<br>Made available in DSpace on 2018-08-06T13:17:18Z (GMT). No. of bitstreams: 1 Vieira_MelissaGurgelAdeodato_D.pdf: 15789035 bytes, checksum: a4310c5dbe44a9a8965201da94b3f2d8 (MD5) Previous issue date: 2006<br>Resumo: o papel ainda desempenha um fator chave na cultura e na difusão da informação apesar dos grandes avanços tecnológicos. Embora seja produzido a partir de um recurso renovável, como é a madeira, existe tecnologia que permite a sua reutilização a pa
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Nygårds, Sofie. "Nanocellulose in pigment coatings : Aspects of barrier properties and printability in offset." Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-69080.

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Papers are coated in order to improve the properties of the surface, to improve printability and to include new functionalities like barriers properties. Typical coating formulation contains a high number of components, some are made from minerals and others are manufactured from petroleum. The barrier properties of today's paper based packages are plastics and/or aluminum             foil. Environmentally friendly substitutie of these nonrenewable materials are needed.  Nanocellulose is a promising material                 and of a growing interest as an alternative to petroleum-based materia
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