Search for dissertations about: "sulfonation"

Showing result 1 - 5 of 13 swedish dissertations containing the word sulfonation.

  2. 1. Effects of temperature and sulfonation on deformation of spruce wood

    Author : Lars Johansson; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; sulfonation; deformation; temperature; Scandinavian spruce; shear stress; torsional stress; fracture surface; SEM;

    Abstract : .... READ MORE

  4. 2. Mechanical Pulp. Effects of Pretreatment and Wood Source on Fiber Separation and Pulp Properties

    Author : Lars Johansson; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; torsional stress; pulp properties; chips; impregnation; screw press; SEM; mechanical pulp; sulfonation; shear stress; fracture surface; wood quality; temperature;

    Abstract : The work presented in this thesis concerns the mechanical pulping process and the effects of wood source and pretreatment conditions on the pulp properties. In the first part, the deformation of Norway spruce (Picea abies) wood samples was investigated under shear and torsional loading at different temperatures (20-95°C) and sulfonation conditions. READ MORE

  5. 3. Engineering of lignin in wood towards functional materials

    Author : Gabriella G. Mastantuoni; Qi Zhou; Lars Berglund; Jean-Marie Raquez; KTH; []
    Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Cellulose; wood; nanotechnology; sulfonation; biocomposite; cross-linking; densification; transparent film; wood foam; conductivity; Cellulosa; trä; nanoteknologi; sulfonering; biokomposit; tvärbindning; förtätning; transparent film; poröst trämaterial; konduktivitet; Fiber- och polymervetenskap; Fibre and Polymer Science;

    Abstract : Through 270 million years of evolution, the finely tuned hierarchical structure of wood has been optimized for efficient nutrient transport and exceptional mechanical stability. Its distinctive orthotropic constitution can provide inspiration and design opportunities for the development of novel functional materials. READ MORE

  6. 4. Oxidized Cladophora nanocellulose derivatives : Functionalization towards biocompatible materials

    Author : Igor Rocha; Jonas Lindh; Natalia Ferraz; Albert Mihranyan; Maria Strömme; Eva Malmström Jonsson; Uppsala universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Cladophora nanocellulose; TEMPO oxidation; periodate oxidation; sulfonation; cellulose beads; surface properties; biomaterials; cell studies; hemocompatibility;

    Abstract : Nanocellulose is a promising candidate for biomedical applications because of its enhanced mechanical properties, increased surface area and greater porosity compared to bulk cellulose.This thesis investigates the functionalization of Cladophora nanocellulose and evaluates the influence of these modifications on physicochemical properties and biocompatibility of the material. READ MORE

  7. 5. Proton-Conducting Polymers and Membranes for Fuel Cells-Preparation and Properties

    Author : Lina Karlsson; Kemiska institutionen; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Polymer technology; solution properties; aggregation; state of the water; sulfonation; polyelectrolyte; polymer electrolyte; ionomer; acrylamide copolymer; polyphenylsulfone; polysulfone; water absorption; ion exchange membrane; proton conductivity; Polymerteknik; biopolymers;

    Abstract : The development of new materials for use in fuel cells is of importance for the probable replacement of the combustion engine by this technology in public vehicles in the future. The proton-conducting polymer electrolyte membrane is one of the main components in the fuel cell. READ MORE