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Dissertations / Theses on the topic 'Cellulose fibre'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

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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2

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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3

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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4

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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5

Fisher, Alex K. "Durability design parameters for cellulose fibre reinforced concrete pipes in aggressive environments." Thesis, Queensland University of Technology, 2003.

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6

Paterson, Daniel Thomas. "Understanding rapid dewatering of cellulose fibre suspensions." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/58195.

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Rapid dewatering of cellulose fibre suspensions is a fundamental process in many unit operations in the production of pulp and paper. Understanding dewatering behaviour can be applied to optimizing designs of industrial equipment. In this project, we assess the suitability of a well-established modeling approach, referred to as the base model, at capturing the one dimensional dewatering behaviour of cellulose fibre suspensions seen experimentally. This modeling approach requires two closure relationships determined experimentally, i.e. compressive yield stress and permeability. Experimental eq

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7

Kihlman, Martin. "Dissolution of cellulose for textile fibre applications." Licentiate thesis, Karlstads universitet, Avdelningen för kemiteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-12798.

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This thesis forms part of a project with the objective of developing and implementing a novel, wood-based, process for the industrial production of cellulose textile fibres. This new process should not only be cost effective but also have far less environmental impact then current processes. Natural and man-made fibres are usually plagued with problems (e.g. economic and environmental) and are unsuitable in meeting growing demands. The focus of this thesis was therefore to investigate the dissolution of cellulose derived from various pulps in novel aqueous solvent systems. It was s

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8

Bergström, Roger. "Fibre flow mechanisms." Doctoral thesis, KTH, Fiber- och polymerteknik, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-240.

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The flow behaviour, and primarily the floc-floc interaction, of pulp paper suspensions have been studied visually. Analogy models based on these observations have been developed as well as the identification of important parameters of floc break-up in low shear rate flow fields. Floc compressions and the locations of voids (areas of lower fibre concentration) where found to influence the floc splitting mechanism. Based on this investigation an equipment for measuring the load carrying ability of fibre flocs and networks was designed, and the effect of measurement geometry, network structure an

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9

Solberg, Daniel. "Adsorption kinetics of cationic polyacrylamides on cellulose fibres and its influence on fibre flocculation." Licentiate thesis, KTH, Fibre and Polymer Technology, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1665.

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<p>The adsorption of cationic polyacrylamide (C-PAM) and silicananoparticles onto a model surface of silicon oxide wascompared with the adsorption of C-PAM to fibres and theirinfluence on flocculation of a fibre suspension. An increase inionic strength affects the polyelectrolyte adsorption indifferent ways for these two systems. With the silica surface,an increase in the ionic strength leads to a continuousincrease in the adsorption. However, on a cellulose fibre, theadsorption increases at low ionic strength (1 to 10 mM NaCl)and then decreases at higher ionic strength (10 to 100 mMNaCl). It

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10

Tawari, Akram. "Development of a cellulose acetate hollow-fine-fibre membrane." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/4253.

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Thesis (MScEng (Process Engineering))--University of Stellenbosch, 2010.<br>ENGLISH ABSTRACT: The goal of this study is to produce cellulose acetate (CA) hollow-fine-fibre membranes with good water flux performance in the 95 – 96% salt retention range for brackish water desalination from first principles. First, the acceptable range of fibre dimensions was determined by means of a collapse pressure calculation using the elastic buckling pressure equation (thin shell assumption). Second, the pressure drop across the fibre wall in the hollow-fine fibre was determined by using the Hagen-Pois

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11

Källgren, Rasmus. "Influence of level of cellulose oxidation and surface treatment on the adhesion between cellulose beads." Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-276412.

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With the growing impact of climate change on both political decisions and how companies develop their products, it is increasingly important to find environmentally friendly alternatives to fossil-based materials. One of the more interesting materials in this respect is cellulose, which is the world's most naturally occurring polymer and can be used in a variety of applications. One way to modify the fibers and to change their properties is to use a method called Layer-by-Layer (LbL) treatment where two polymers of opposite charge are alternately adsorbed to the fiber surface. Another possibil

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12

Gaffiot, Lauric. "Optimisation d’un procédé d’élaboration d’un composite à base de fibres naturelles." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAI056.

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Les matériaux composites constituent aujourd’hui un domaine très dynamique tant au niveau de l’industrie que de la recherche. Dans ce cadre, les renforts d’origines naturelles représentent une alternative intéressante aux fibres synthétiques de par leurs propriétés mécaniques élevées, leur faible densité et leur caractère biosourcé, afin de répondre à l’accroissement des niveaux de performances ciblés ainsi qu’aux exigences économiques et écologiques actuelles.Ces travaux s’inscrivent dans un projet regroupant laboratoires de recherche, fournisseurs et end-users, visant à développer un matéria

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13

Li, Qiang. "Growth of carbon nanotubes on electrospun cellulose fibres for high performance supercapacitors and carbon fibre composites." Thesis, University of Exeter, 2018. http://hdl.handle.net/10871/34360.

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The production of cellulose derived hybrid carbon nanofibre (CNF)/carbon nanotubes (CNTs) electrodes for the fabrication of supercapacitors and carbon fibre composites was investigated. The CNTs were grown via a floating catalyst chemical vapor deposition (CVD) method on the top surface of electrospun cellulose derived CNFs. These CNF and CNF/CNTs samples were then used as electrodes to produce liquid electrolyte-based supercapacitors. The growth of CNTs leads to an improvement of electrochemical performance compared to the plain CNFs. This improvement is due to the grown CNTs enlarging the re

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14

Clipson, J. A. "The preparation, properties and dyeing behaviour of differential-dyeing cellulose." Thesis, Nottingham Trent University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378970.

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15

Kimura, Hajime. "A novel cellulose acetate hollow fibre haemodialysis membrane : preparation and evaluation." Thesis, University of Strathclyde, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396694.

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16

Akbulut, Huseyin. "The properties and performance of cellulose fibre reinforced stone mastic asphalt." Thesis, University of Ulster, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342415.

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17

Deng, Xinying. "Toughening of natural-fibre composites using nano- and microcrystalline cellulose particles." Thesis, Imperial College London, 2018. http://hdl.handle.net/10044/1/64794.

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Environmental concerns have prompted research into natural materials to improve sustainability. Cellulose has some of the highest mechanical properties among naturally-derived materials, and natural-fibre composites have better specific stiffness than glass-fibre composites, and are thus increasingly used in the transport and construction sectors. However, cellulose is hydrophilic and it is difficult to obtain a uniform dispersion of cellulose modifiers in epoxy polymers. This makes it challenging to achieve high performance natural-fibre composites with good delamination resistance, which is

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18

Bergström, Jonas. "Flow Field and Fibre Fractionation Studies in Hydrocyclones." Doctoral thesis, KTH, Fiber- och polymerteknik, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4175.

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Hydrocyclones can be used to fractionate fibres according to their papermaking potential. The obtained fractions typically differ in fibre wall thickness and/or degree of fibre treatment. Despite a multitude of potential application scenarios, the process has so far had little commercial success. This is largely explained by the low fractionation efficiency and unfavourable operating characteristics of the process. The fractionation efficiency of a hydrocyclone is closely related to its flow field. The influence of pulp concentration on the tangential velocity field was therefore studied, by u

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19

Budd, J. "The adsorption of aluminium from aqueous solution by cellulose fibres." Thesis, University of Reading, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379304.

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20

Fillat, Latorre Amanda. "Flax fibre modification using enzyme systems to obtain high-value cellulose products." Doctoral thesis, Universitat Politècnica de Catalunya, 2011. http://hdl.handle.net/10803/38251.

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The aim of this thesis is to modify flax pulp fibres (Linum usitatissimum) by more friendly environmental processes. Pulp and paper research is focussing through enzyme systems investigation for developing green chemistry technologies due to existing environmental concerns and to legal restrictions. Moreover, it exists also an increasing strategic interest in using flax fibres to obtain high-quality specialty papers. That is why we study the application of biotechnology as an efficient alternative to traditional industrial processes based on the use of chemical agents. This wo

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21

De, Magistris Federica. "Wood fibre deformation in combined shear and compression." Doctoral thesis, KTH, Mekanik, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-415.

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Mechanical pulping for producing pulps from softwood suitable for printing grade papers, like news, is a highly energy-intensive process consuming around 2000 kWh/t in electrical energy. Due to increasing energy costs and environmental issues there is a high demand for decreasing this energy consumption. The mechanical treatment of wet wood pieces in a refiner, in the mechanical pulp plant, is a complex mechanical loading. This is a process occurring between rotating discs at high speed and temperatures of 140 °C - 160 °C, where by means of shear and compression forces the fibres are separated

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22

Galland, Sylvain. "Compression-moulded and multifunctional cellulose network materials." Doctoral thesis, KTH, Biokompositer, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-133564.

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Cellulose-based materials are widely used in a number of important applications (e.g. paper, wood, textiles). Additional developments are suggested by the growing interest for natural fibre-based composite and nanocomposite materials. The motivation is not only in the economic and ecological benefits, but is also related to advantageous properties and characteristics. The objective of this thesis is to provide a better understanding of process-structure-property relationships in some novel cellulose network materials with advanced functionalities, and showing potential large-scale processabili

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23

Fahlén, Jesper. "The cell wall ultrastructure of wood fibres : effects of the chemical pulp fibre line." Doctoral thesis, KTH, Fiber- och polymerteknik, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-129.

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Knowledge of the ultrastructural arrangement within wood fibres is important for understanding the mechanical properties of the fibres themselves, as well as for understanding and controlling the ultrastructural changes that occur during pulp processing. The object of this work was to explore the use of atomic force microscopy (AFM) in studies of the cell wall ultrastructure and to see how this structure is affected in the kraft pulp fibre line. This is done in order to eventually improve fibre properties for use in paper and other applications, such as composites. On the ultrastructural level

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24

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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25

Thomson, Cameron Ian. "Probing the Nature of Cellulosic Fibre Interfaces with Fluorescence Resonance Energy Transfer." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/16277.

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The material properties of fibre networks and fibre reinforced composites are strongly influenced by fibre-fibre interactions. Stress transfer between load bearing elements in such materials is often dictated by the nature of the fibre-fibre interface. Inter-fibre bonding is solely responsible for internal cohesion in paper, because all stresses transferred between fibres operate through fibre-fibre bonds. . The future development of cellulosic fibre materials will require an improved understanding of the fibre-fibre interface. Fluorescence resonance energy transfer (FRET) was proposed as a

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26

Kvick, Mathias. "Transitional and turbulent fibre suspension flows." Doctoral thesis, KTH, Strömningsfysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-153018.

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In this thesis the orientation of macro-sized fibres in turbulent flows is studied, as well as the effect of nano-sized fibrils on hydrodynamic stability. The focus lies on enabling processes for new materials where cellulose is the main constituent. When fibres (or any elongated particles) are added to a fluid, the complexity of the flow-problem increases. The fluid flow will influence the rotation of the fibres, and therefore also effect the overall fibre orientation. Exactly how the fibres rotate depends to a large extent on the mean velocity gradient in the flow. In addition, when fibres a

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27

Maccow, Awilda. "A chemo-enzymatic approach to expand the chemical space of cellulose-derived materials : Application to eco-friendly dyeing of cellulosic fibers." Electronic Thesis or Diss., Toulouse, INSA, 2022. http://www.theses.fr/2022ISAT0054.

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L'extension de l'espace moléculaire chimique accessible à partir de la biomasse végétale par des méthodes douces et propres est un sujet d'actualité qui stimule la communauté scientifique afin de développer des produits biosourcés à faible impact environnemental et d'élargir le champ d'exploitation de la biomasse. La fonctionnalisation de la cellulose, le polysaccharide le plus abondant sur la planète, et/ou des cello-oligosaccharides telle que décrite dans cette thèse s'inscrit dans cette démarche. Notre objectif était de développer une méthode chimio-enzymatique impliquant l'action d'une lac

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28

Kvick, Mathias. "Hydrodynamic stability and turbulence in fibre suspension flows." Licentiate thesis, KTH, Mekanik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-95279.

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29

Alamri, Hatem Rashed. "Microstructural design and properties of high performance recycled cellulose fibre reinforced polymer eco-nanocomposites." Thesis, Curtin University, 2012. http://hdl.handle.net/20.500.11937/765.

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In recent years, cellulose fibre-reinforced polymer composites have been gaining a great attention in several engineering applications due to their desirable properties, which include low density, low cost, renewability and recyclability as well as good mechanical properties. Moreover, cellulose fibres are environmentally friendly, non-toxic and renewable materials. Therefore, manufacturing industries especially packaging, building construction, automotive and furniture have been encouraged to use cellulose fibres in their applications instead of the more expansive and non-renewable synthetic

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30

Dallel, Mohamed. "Evaluation du potentiel textile des fibres d'Alfa (Stipa Tenacissima L.) : caractérisation physico-chimique de la fibre au fil." Phd thesis, Université de Haute Alsace - Mulhouse, 2012. http://tel.archives-ouvertes.fr/tel-00844129.

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Compte tenu des propriétés spécifiques de l'Alfa, de son haut potentiel fibreux, des conditions de sa production et de sa transformation très écologiques, nous nous sommes proposés de mener une étude ayant pour objectif l'extraction des fibres cellulosiques à partir de la plante en vue d'applications textiles. L'extraction est conduite suivant différentes voies : mécanique, classique à la soude et enzymatique. A la lumière des différentes caractéristiques de ces fibres issues des différents procédés d'extraction, nous avons établi des corrélations entre la structure et les propriétés des fibre

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31

Doineau, Estelle. "Modification de fibres de lin par des nanocristaux de cellulose et du xyloglucane pour le développement de composites biosourcés hiérarchiques Adsorption of xyloglucan and cellulose nanocrystals on natural fibres for the creation of hierarchically structured fibres Hierarchical thermoplastic biocomposites reinforced with flax fibres modified by xyloglucan and cellulose nanocrystals Development of Bio-Inspired Hierarchical Fibres to Tailor the Fibre/Matrix Interphase in (Bio)composites." Thesis, IMT Mines Alès, 2020. http://www.theses.fr/2020EMAL0007.

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Ce travail de thèse vise à développer un traitement de surface de fibres de lin pour l’amélioration des propriétés mécaniques de biocomposites à matrice polymère et renforts en lin. Cette modification de surface s’inspire des structures hiérarchiques présentes dans les systèmes biologiques (os, nacre ou bois), constitués de nano-objets permettant un meilleur transfert de charges dans ces matériaux. Cette présence d’objets de dimensions nanométriques permet notamment d’atteindre des valeurs de contrainte et ténacité élevées et de limiter la propagation de fissures. Dans ces travaux de recherche

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32

Peng, Joe Zhou. "Modelling of the cellulose and cement mineral bond and the mechanism of aluminous compounds in retarding cement carbonation." Thesis, View thesis, 2001. http://handle.uws.edu.au:8081/1959.7/26659.

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Analysis of calcium and oxygen atom arrays of known cement minerals and the structures of cellulose polymorphs were performed to see if it was possible to arrange a cellulose fibre on a cement mineral face such that the fibre is bonded by a repeating array of hydrogen or hydroxide coordination bonds for the full length of the attachment. Of the sixteen important cement minerals modelled, xonotlite, foshagite, tricalcium aluminate hydrate, chondronite and rosenhahnite could form such bonds to modified cellulose fibre. However, this was not the case for other cement minerals, especially tobermor

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Peng, Joe Zhou. "Modelling of the cellulose and cement mineral bond and the mechanism of aluminous compounds in retarding cement carbonation /." View thesis, 2001. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20030714.164824/index.html.

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34

Quajai, Sirisart, and soj@kmitnb ac th. "Biopolymer Composite based on Natural and Derived Hemp Cellulose Fibres." RMIT University. Applied Sciences, 2006. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20061222.111612.

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The aim of this research was to study the effect of pre-treatment and modification processes on the properties of hemp cellulose fibre for biopolymer composites application. Hemp fibres have been modified by various extraction, swelling, chemical and enzymatic treatments. The morphology and mechanical properties of the modified fibres have been measured. Biopolymer composites have been prepared using the modified fibres and matrices of cellulose acetate butyrate and cellulose solutions derived from hemp. The first fibre treatment employed was acetone extraction and mercerization. A low press

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35

Rehberger, Marcus. "Hybrid printing on fibre-based packaging : Performance, Quality and Market." Doctoral thesis, KTH, Medieteknik och grafisk produktion, Media, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-27022.

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Variable data will play a decisive role in the future of packaging and product promotion. Variable data printing (VDP) is a technique whereby certain information can be altered in an otherwise static layout with the help of a digital printing system, and in the packaging industry a wide range of applications is possible. Inkjet printing, due to its non-impact printing (NIP) principle, is the most suitable technology to use when applying variable data on packaging and to offer customized and even personalized prints for the industry and the end-consumer (van Daele, 2005). The aim of the work de

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36

Blachot, Jean-François. "Étude des propriétés rhéologiques des solutions cellulose/monohydrate de N-oxyde de N-méthylmorpholine (NMMO) : filage de cellulose extraite de paille de blé : structure et fibrillation des fils obtenus." Université Joseph Fourier (Grenoble ; 1971-2015), 1995. http://www.theses.fr/1995GRE10189.

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Une etude originale des proprietes rheologiques de solutions de cellulose dissoute dans du monohydrate de n-oxyde de n-methylmorpholine (nmmo) nous a permis de determiner l'influence de la concentration et de la masse molaire de la cellulose sur les valeurs de la viscosite newtonienne et du temps d'ecoulement qui evoluent respectivement comme c#4#,#6m#5 et c#2#,#7m#5. D'autre part, des mesures effectuees en spectrometrie mecanique a differentes temperatures ont permis d'elaborer une courbe maitresse decrivant le comportement de ces solutions depuis l'etat visqueux jusqu'a l'etat vitreux. Nous

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Ketabchi, Mohammad-Reza. "Preparation, characterisation and optimisation of cellulose nanoparticles from kenaf fibre and its application in polylactic acid reinforcement." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/41545/.

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In this work, cellulose nanoparticles (CNP) were extracted from kenaf fibre and were used to reinforce natural rubber/polylactic acid biocomposites. The kenaf fibre was subjected for pretreatment by three different techniques namely, alkali treatment, bleaching, and sonication. A full factorial design of experiment was conducted in order to optimise the extraction process. The optimisation levels were adjusted according to single and full factorial studies of micro cellulose fibres. The extracted CNP was then structurally and morphologically characterised. The optimum nanoparticles were next e

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38

Lembré, Pierre. "Contribution à l’étude de l’organisation et des propriétés mécaniques d’exopolymères de matrice de biofilms modèles." Thesis, Cergy-Pontoise, 2012. http://www.theses.fr/2012CERG0612/document.

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Les biofilms sont des édifices macromoléculaires qui résultent de l'adhérence de microorganismes à une surface. Ils sont constitués de cellules enchâssées dans un réseau d'exopolymères d'origine biologique qui forment une matrice extracellulaire. Les biofilms posent des problèmes technologiques et sanitaires dans de nombreux domaines, aussi bien agroalimentaire, médical, ou industriel. Comprendre les mécanismes de formation de ces structures est donc un enjeu majeur. Malgré une grande diversité de la structure des biofilms, de grands principes semblent en régir la composition. Ainsi, la présen

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39

Bonini, Céline. "Mise en évidence du rôle des interactions fibre/fibre et fibre/matrice dans des nanocomposites à renfort cellulosique et matrice apolaire (atactique et isotactique)." Université Joseph Fourier (Grenoble), 2000. http://www.theses.fr/2000GRE10195.

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La premiere partie de ce travail est consacree a la mise en uvre de renforts cellulosiques a base de whiskers. Les whiskers ont un facteur de forme eleve et un diametre nanometrique. Trois types de renfort differant par leur etat de dispersion et leur etat de surface ont ete elabores. Un systeme de whiskers disperses en solvant organique a ete mis au point grace a l'utilisation d'un tensioactif, les deux autres types de renfort consistent en des amas de whiskers nus ou greffes avec du polypropylene maleise. La deuxieme partie de ce travail porte sur la mise en uvre et la caracterisation mecani

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40

Mangiante, Gino. ""Green" and innovative chemical modifications of cellulose fibers." Thesis, Lyon, INSA, 2013. http://www.theses.fr/2013ISAL0024.

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Ce projet de recherche mené en collaboration avec le CTP (Centre Technique du papier) a eu comme objectif de mettre en place une stratégie de greffage de polymères sur des fibres de cellulose via « Chimie Click » dans l’eau et dans des conditions douces et respectueuses de l’environnement afin de conférer de nouvelles propriétés mécaniques aux papiers résultants. La première étape a été d’élaborer une fonctionnalisation alcyne des fibres dans des conditions douces – dans l’eau ou dans un mélange eau/isopropanol – permettant à la fois une fonctionnalisation conséquente tout en préservant la cri

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Köpcke, Viviana. "Improvement on cellulose accessibility and reactivity of different wood pulps." Licentiate thesis, KTH, Fibre and Polymer Technology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4792.

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<p>Cellulosans tillgänglighet och reaktivitet är nyckelparametrar vid framställning av regenererad cellulosa och cellulosaderivat. Det är välkänt att på grund av cellulosans kristallina struktur är tillgängligheten begränsad för lösningsmedel och olika reagens. Till exempel kan en inhomogen substitution av hydroxylgrupperna i cellulosakedjan resultera i cellulosaderivat av sämre kvalitet. Baserat på detta har en del av arbetet i denna studie fokuserat på att förbättra cellulosans tillgänglighet och reaktivitet genom att studera effekten av olika enzymatiska behandlingar med monokomponent endog

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Favier, Véronique. "Étude de nouveaux matériaux composites obtenus à partir de latex filmogènes et de whiskers de cellulose : effets de percolation mécanique." Grenoble INPG, 1995. http://www.theses.fr/1995INPG0120.

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De nouveaux materiaux composites, resultant de l'association originale d'un latex polymere filmogene et d'une suspension aqueuse de monocristaux (whiskers) de cellulose, ont ete elabores sous forme de films, par evaporation directe du melange aqueux. Pour des temperatures superieures a la temperature de transition vitreuse des composites, un effet de renfort remarquable et inhabituel pour les faibles fractions volumiques de whiskers mises en jeu (inferieures a 0. 1) a ete observe. Il se traduit par une forte augmentation du module elastique ainsi que du seuil de contrainte et une nette amelior

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Thieblesson, Lydie Marcelle. "Élaboration et caractérisation de matériaux issus de ressources locales recyclées ou biosourcées." Thesis, Rennes 1, 2018. http://www.theses.fr/2018REN1S133/document.

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En réponse à une forte croissance démographique mondiale, et notamment africaine, il est nécessaire d’anticiper les besoins de la population en terme de bâtiment. Il s’agit alors de développer des matériaux alternatifs présentant des performances multi-physiques adéquates tout en ayant un faible impact sur l’environnement. Ce travail porte sur l’élaboration et la caractérisation de composites utilisables comme produits constructifs de partition (cloison, faux plafonds). La sélection des matières premières intègre des critères de développement durable, en considérant leur disponibilité locale m

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Elias, Robert M. "The chemical reactivity of thermo mechanical pulp (TMP) fibres : a detailed kinetic study of the reaction between fibre and isolated fractions of hollcellulose and cellulose with succinic anhydride." Thesis, Bangor University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239884.

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Goubet, Florence. "Etude de la biosynthèse de polysaccharides pariétaux des fibres cellulosiques au cours du développement du lin." Rouen, 1994. http://www.theses.fr/1994ROUES048.

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Les fibres de lin contiennent de la cellulose incrustée de polymères hydrosolubles. L'étude des polysaccharides hydrosolubles de la paroi des fibres met en évidence 2 types de β galactanes: le β 1-4 galactane et le β 1-3, β 1-6 galactane. L'activité β 1-4 galactane synthase a un pH optimal de 8 et se localise au niveau de vésicules de faible densité tandis que l'activité β 1-3, β 1-6 galactane synthase a un pH optimal de 6,5 et se localise a la fois au niveau des vésicules de faible densité et de l'appareil de Golgi. Dans les cellules en suspension, la synthèse de β 1-4 galactanes est maximale

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Manolas, Christos. "Fractionnement du sorgho à fibre. Extraction et caractérisation des hémicelluloses de la moe͏̈lle. Etude des matériaux composites." Toulouse, INPT, 1993. http://www.theses.fr/1993INPT040G.

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Un bilan bibliographique des differentes techniques de fabrication de pate a papier a partir des plantes annuelles est dresse. La repartition des principaux constituants de la plante entiere et de la moelle de sorgho a balai (broom sorghum) est suivie pour 150 nouveaux hybrides. Le fractionnement de la moelle de sorgho par extraction a l'eau puis a la soude conduit a l'obtention d'hemicelluloses a et b, avec des rendements de 6 et 19% respectivement et un residu cellulosique. Les hemicelluloses extraites sont des arabinoxylanes substitues par des motifs 4-0 methyl glucuroniques. Les hemicellul

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Antonsson, Stefan. "Strategies for improving kraftliner pulp properties." Doctoral thesis, KTH, Träkemi och massateknologi, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9718.

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A large part of the world paper manufacturing consists of production of corrugated board components, kraftliner and fluting, that are used in many different types of corrugated boxes. Because these boxes are stored and transported, they are often subjected to changes in relative humidity. These changes together with mechanical loads will increase the deformation of the boxes compared to the case where the same loads are applied in a static environment. This enlarged creep due to the changes in relative humidity is called mechano-sorptive or accelerated creep. Mechano-sorptive creep forces prod

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Lingström, Rikard. "On the Adhesion Between Substrates Covered with Polyelectrolyte Multilayers." Doctoral thesis, KTH, Fiber- och polymerteknik, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4825.

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This thesis examines the formation of Polyelectrolyte Multilayers (PEM) on cellulose fibres as a new way of influencing the fibre surface and the adhesion between wood fibres. The aim of the study was to enhance the fundamental understanding of the adsorption mechanisms behind the formation of Polyelectrolyte Multilayers on cellulose fibres; to study how the properties of the layers can be influenced and to show how the properties of the layers influence the adhesion between the fibres and the strength of paper sheets made from the PEM treated fibres. Different polyelectrolyte systems are know

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Viforr, Silvia. "A way of reducing the energy demand in TMP by shear/compression deformation." Licentiate thesis, Stockholm : Department of Polymer Technology, Royal Institute of Technology, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4282.

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Gorski, Dmitri. "ATMP Process : Improved Energy Efficiency in TMP Refining Utilizing Selective Wood Disintegration and Targeted Application of Chemicals." Doctoral thesis, Mittuniversitetet, Institutionen för naturvetenskap, teknik och matematik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-13844.

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This thesis is focused on the novel wood chip refining process called AdvancedThermomechanical Pulp (ATMP) refining. ATMP consists of mechanical pretreatmentof chips in Impressafiner and Fiberizer prior to first stage refining atincreased intensity. Process chemicals (this study was concentrated on hydrogenperoxide and magnesium hydroxide) are introduced into the first stage refiner.It is known that the use of chemicals in TMP process and first stage refining atelevated intensity can reduce the energy demands of refining. The downside is thatthey also alter the character of the produced pulp.

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