Download or read book Dissolution de la cellulose dans les solvants organiques written by Daniel Mancier and published by . This book was released on 1979 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: ETUDE PAR RMN DES SOLUTIONS ORGANIQUES DE CELLULOSE. SOLUTIONS DE CELLULOSE DANS LA NMO: MOUVEMENTS DES MOLECULES DU SOLVANT ET DU POLYSACCHARIDE, MESURES DES TEMPS DE RELAXATION DU **(13)C. SYNTHESE DE NMO DEUTERIEE ET DE CELLULOSE MARQUEE AU CARBONE 13

Download or read book Dissolution et fonctionnalisation de la cellulose dans les m langes co solvant fluides sous et supercritiques written by Fatima Lafrad and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce travail de thèse présente une étude détaillée de la dissolution et de la fonctionnalisation de la cellulose dans les mélanges co-solvant/fluides sous et supercritiques. Plusieurs fluides ont été utilisés, notamment les mélanges supercritiques d'acétone/CO2 et d'éthanol/CO2, urée/CO2, l'eau sous critique, ainsi que les mélanges 1,8-Diazabicycloundec-7-ène(DBU)/CO2 et méthanol/DBU/CO2.La spectroscopie infrarouge a été utilisée pour étudier les interactions intermoléculaires dans les mélanges supercritiques d'acétone/CO2 et d'éthanol/CO2, à des différentes fractions molaires, dans un large domaine de température. Des calculs par dynamique moléculaires couplés à des mesures par spectroscopie infrarouge ont été réalisés pour comprendre les interactions liaisons hydrogènes dans l'eau sous et supercritique. Des suivis cinétiques in-situ par spectroscopie infrarouge pour optimiser la dissolution de la cellulose dans plusieurs solvants dans les conditions sous et supercritiques, ont été réalisés. Nous n'avons pas trouvé de signature spectrale de la dissolution de la cellulose dans les mélanges acétone/CO2 et éthanol/CO2. Par contre, la cellulose s'est transformée en cellulose carbamate dans le milieu urée/CO2 supercritique. Les photographies MEB de la cellulose traitée dans les liquides ioniques commutables, montrent une modification de la morphologie de la cellulose. Plusieurs techniques spectroscopiques ont été utilisées dans cette étude (FTIR en transmission ou en ATR, la CP/MAS RMN de solide, le MEB). Les calculs de chimie quantique nous ont permis de proposer un mécanisme réactionnel pour la réaction de la cellulose dans le mélange DBU/CO2.

Download or read book Some New Solvents for Cellulose and Their Action on this Substance written by Horace Grove Deming and published by . This book was released on 1911 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Cellulose Solvents For Analysis Shaping and Chemical Modification written by Tim Liebert and published by OUP USA. This book was released on 2010-09-23 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book will give an overview of the current state-of-the-art concerning the activation and dissolution of cellulose in a broad variety of solvents. Research on this topic can lead to new pathways for the utilization of the most abundant terrestrial biomolecule and may therefore be the basis for new green strategies towards advanced materials.

Download or read book M canismes de gonflement et de dissolution des fibres de cellulose written by Nicolas Le Moigne and published by . This book was released on 2008 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: Le but de ces travaux était d'étudier les mécanismes de gonflement et de dissolution des fibres de cellulose en faisant varier la qualité du solvant (N-methylmorpholine-N-oxide avec différentes quantités d'eau et solutions aqueuses de NaOH à 8%), les conditions de dissolution, comme la tension, et l'origine des fibres (coton, bois, fibres régénérées ou dérivées). Les mécanismes de gonflement et de dissolution ont été étudiés par des observations microscopiques à haute résolution. Une séparation sélective des fractions solubles et insolubles a été réalisée par centrifugation. La distribution de masse molaire, la cristallinité, la composition en sucre, l'allomorphie et la quantité de chaque fraction ont été analysées. A partir de ces résultats, nous avons pu mieux décrire les mécanismes de gonflement et de dissolution des fibres de cellulose et ainsi identifier les principaux paramètres gouvernant la dissolution. Nos résultats montrent que les caractéristiques structurales et moléculaires des fibres de cellulose ainsi que les paramètres de procédés doivent être mieux contrôlés afin d'améliorer la dissolution. (i) Les paramètres de procédés concernent la convection du solvant et la possibilité de mouvements des fibres dans le solvant, (ii) les paramètres structuraux concernent la suppression des parois externes, la déstructuration des parois internes et la suppression sélectives des hémicelluloses, (iii) les paramètres moléculaires concernent la thermodynamique, comme la longueur des chaînes, la cristallinité mais aussi l'amélioration de la mobilité conformationelle des chaînes.

Download or read book Cellulose Chemistry and Technology written by and published by . This book was released on 1975 with total page 700 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Some New Solvents for Cellulose and Their Action on This Substance written by Horace Grove Deming and published by Palala Press. This book was released on 2016-04-27 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work.This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

Download or read book La cellulose written by Marcel Chêne and published by . This book was released on 1967 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advances in Carbohydrate Chemistry and Biochemistry written by and published by Academic Press. This book was released on 2010-11-02 with total page 562 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since its inception in 1945, this serial has provided critical and integrating articles written by research specialists that integrate industrial, analytical, and technological aspects of biochemistry, organic chemistry, and instrumentation methodology in the study of carbohydrates. The articles provide a definitive interpretation of the current status and future trends in carbohydrate chemistry and biochemistry. - Features contributions from leading authorities and industry experts - Informs and updates on all the latest developments in the field

Download or read book Canadian Journal of Chemistry written by and published by . This book was released on 1984 with total page 668 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Celluloseverbindungen und ihre besonders wichtigen verwendungsgebiete bd Cellulosevorbehandlung celluloseester anorganischer s uren und celluloseester aliphatischer aromatischer und heterocyclischer carbons uren und sulfos uren sowie die zugeh rigen theresterverbindungen written by Otto Faust and published by . This book was released on 1935 with total page 1520 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Genie Civil written by and published by . This book was released on 1924 with total page 732 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Injectable formulations forming an implant in situ as vehicle of silica microparticles embedding superparamagnetic iron oxide nanoparticles for the local magnetically mediated hyperthermia treatment of solid tumors written by Pol-Edern Le Renard and published by LE RENARD Pol-Edern. This book was released on 2011 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Eucepa Symposium written by European Liaison Committee for Cellulose and Paper and published by . This book was released on 1958 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the 6th- symposium include also Proceedings of the 8th- European TAPPI meeting.

Download or read book Dictionnaire de chimie pure et appliqu e written by Adolphe Wurtz and published by . This book was released on 1906 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Canadian Journal of Microbiology written by and published by . This book was released on 2000-07 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Holzforschung written by and published by . This book was released on 1970 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt: