Search for dissertations about: "cellulose fibers"

Showing result 1 - 5 of 125 swedish dissertations containing the words cellulose fibers.

  1. 1. Molecular orientation in cellulose fibers and composites

    Author : Leo Svenningsson; Chalmers University of Technology; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; composite; molecular orientation; X-ray scattering; fibers; Raman spectroscopy; regenerated cellulose; carbon fibers; solid-state NMR; lignin;

    Abstract : The scope of this thesis is to quantitatively investigate the molecular orientation distribution of regenerated cellulose fibers and composites. The molecular orientation is known to affect macroscopic properties such as tensile strength of the fiber. READ MORE

  2. 2. Air-gap spinning of lignin-cellulose fibers

    Author : Jenny Bengtsson; Chalmers University of Technology; []
    Keywords : cellulose; carbon fibers; ionic liquid; lignin; air-gap spinning;

    Abstract : Co-processing of lignin and cellulose, the two main constituents of wood, has previously been identified as a potential route for the production of inexpensive and bio-based carbon fibers. The first step in this process is to spin a precursor fiber. READ MORE

  3. 3. Melt-processing and properties of thermoplastic composites based on ethylene-acrylic acid copolymer reinforced with wood nanocellulose

    Author : Abhijit Venkatesh; Chalmers University of Technology; []
    Keywords : Injection moulding; Cellulose nanofibers; Melt rheology; Cellulose nanocrystals; Mechanical properties; Cellulose; Pulp fibers; Composite; Extrusion;

    Abstract : Composites reinforced with cellulose nanofibers (CNF), both modified and unmodified cellulose nanocrystals (CNC) and pulp fibers have been prepared through small-scale and large-scale methods. The composites were produced by water-assisted dispersion mixing, drying and compression moulding on the laboratory scale and by extrusion and injection moulding for the large-scale production. READ MORE

  4. 4. Phosphorylated Cellulose Nanofibrils : A Nano-Tool for Preparing Cellulose-Based Flame-Retardant Materials

    Author : Maryam Ghanadpour; Lars Wågberg; Jeffrey W. Gilman; KTH; []
    Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; phosphorylated cellulose nanofibrils; flame-retardant; Fiber- och polymervetenskap; Fibre and Polymer Science;

    Abstract : The growing awareness of the need for a circular society and a circular chemistry has spurred the interest in using wood-based cellulose as a raw material for the preparation of new macroscopic devices and construction materials. The interest has been particularly focused on cellulose nanofibrils (CNF), which has led to the development of new material concepts through a nanoscale bottom-up engineering using renewable CNF. READ MORE

  5. 5. Chemical Modification of Electrospun Cellulose Nanofibers

    Author : Johannes Thunberg; Chalmers University of Technology; []
    Keywords : NATURVETENSKAP; TEKNIK OCH TEKNOLOGIER; NATURAL SCIENCES; ENGINEERING AND TECHNOLOGY; Cellulose Dissolution; Ionic liquid; Polypyrrole; Zeolitic Imidazolate Framework; Nanocellulose; Electrospinning; Cellulose; Metal-organic Framework;

    Abstract : The forest industry is a large part of the Swedish economy and the export of pulp, paper and wood products constitutes 11% of the total Swedish export of goods. The main product of a pulp mill is purified cellulose, which has many great properties like biodegradability and non-toxicity. READ MORE