Sökning: "cationic modification"

Visar resultat 1 - 5 av 35 avhandlingar innehållade orden cationic modification.

1. 1. Strategies for cellulose fiber modification

   Författare :Per Persson; KTH; []
   Nyckelord :Candida antarctica lipase B; cationic catalysis; cellulose-binding module; dendrimer; enzymatic polymerization; fiber modification; silica-cast replica; sol-gel mineralization; organocatalysis; xyloglucan endotransglycosylase;

   Sammanfattning : This thesis describes strategies for and examples ofcellulose fiber modification.The ability of an engineered biocatalyst, acellulose-binding module fused to theCandida antarcticalipase B, to catalyze ring-openingpolymerization of e-caprolactone in close proximity tocellulose fiber surfaces was explored. LÄS MER

3. 2. Binary mixtures and cationic modification of protic ionic liquids. Local structure and transport properties

   Författare :Iqbaal Abdurrokhman; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; nuclear magnetic spectroscopy; cationic modification; triazolium; imidazolium; proton mobility; Protic ionic liquids; vibrational spectroscopy; impedance spectroscopy; binary mixtures; synthesis;

   Sammanfattning : Protic ionic liquids are a subclass of ionic liquids, which in many cases are obtained by mixing an equimolar amount of Brønsted acid and base. Protic ionic liquids possess an exchangeable proton that gives them distinct features, e.g. LÄS MER

4. 3. Surface Modification of Cellulose by Covalent Grafting and Physical Adsorption

   Författare :Linn Carlsson; Anna Carlmark; Eva Malmström; M. Naceur Belgacem; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Surface modification; cellulose; covalent modification; physical adsorption; polymer synthesis;

   Sammanfattning : The interest in new environmentally friendly cellulose‐based productshas increased tremendously over the last years. At the same time theSwedish forest industry faces new challenges in its strive to increase the utilization of cellulose fibers in high‐value end‐products. LÄS MER

5. 4. Zwitterionic Separation Materials for Liquid Chromatography and Capillary Electrophoresis : Synthesis, Characterization and Application for Inorganic Ion and Biomolecule Separations

   Författare :Wen Jiang; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Analytical chemistry; Zwitterionic; stationary phase; separation; liquid chromatography; capillary electrophoresis; sulfobetaine; modification; covalently bonded; graft polymerization; ζ-potential; Analytisk kemi; Analytical chemistry; Analytisk kemi;

   Sammanfattning : Liquid Chromatography (LC) and Capillary Electrophoresis (CE) are modern analytical techniques that play very important roles in many areas of modern science such as life science, biotechnology, biomedicine, environmental studies, and development of pharmaceutics. Even though these two techniques have existed and been subjected to studies for several decades, the developments of new separation materials for them are still very important till now in order to meet the different new demands for improvement from other disciplines in science. LÄS MER

7. 5. Characterisation of the Substituent Distribution in Starch and Cellulose Derivatives

   Författare :Sara Richardson; Centrum för analys och syntes; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Chemistry; Analytisk kemi; Cationic amylopectin; Hydroxypropyl amylopectin; Ethyl hydroxyethyl cellulose; Substituent distribution; Enzymic degradation; HPAEC-PAD; MALDI-TOF-MS; ESI-MS; Kemi; Analytical chemistry;

   Sammanfattning : Starch and cellulose can be chemically modified to produce derivatives with specific properties. Knowledge of correlations between the modification reaction, substituent distribution and properties is important in order to design modification processes so as to produce derivatives with the desired properties. LÄS MER