Sökning: "degree of acetylation"

Visar resultat 1 - 5 av 13 avhandlingar innehållade orden degree of acetylation.

  1. 1. New Tools for Analysis of Wood and Pulp Components - Application of MALDI-TOF Mass Spectroscopy and Capillary Zone Electrophoresis

    Författare :Anna Jacobs; KTH; []
    Nyckelord :Capillary zone electrophoresis; carbohydrate composition; degree of acetylation; degree of polymerization; enzymatic hydrolysis; hardwood; hemicellulose; hexenuronic acid; lignin; MALDI-TOF mass spectroscopy; molar mass; molar mass distribution; olig;

    Sammanfattning : In the present thesis, capillary zone electrophoresis (CZE),matrix-assisted laser desorption/ionization time-of-flight massspectroscopy (MALDI-MS) and size-exclusion chromatography incombination with off-line MALDI-MS (SEC/MALDI-MS) have beenapplied successfully to the analysis of wood and pulpcomponents.The carbohydrate compositions of pulp and holocellulosesamples, as well as of isolated hemicellulose preparations,were determined employing enzymatic hydrolysis and subsequentanalysis of the saccharides released by CZE. LÄS MER

  3. 2. Characterization of acetylated hemicelluloses from hardwood

    Författare :Maria Nordström; KTH; []
    Nyckelord :acetyl; aspen; birch; chlorite delignification; degree of acetylation;

    Sammanfattning : .... LÄS MER

  4. 3. Bioplastics from Biomass - Acetylation of Xylans with Green Chemistry

    Författare :Agnes Stépán; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : There is social, environmental and increasing economic pressure on the industrial sector to substitute non-renewable resources with renewable ones as the increasing World population is exponentially depleting the fossil fuel supplies of the Earth. Each year about 260 million tons of plastics are produced from crude oil and most of it ends up as waste. LÄS MER

  5. 4. Effects of Molecular Architecture of Xylans on Material Properties

    Författare :Maria Gröndahl; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : Xylans are among the most abundant polymers on earth. Nature has created xylans with different molecular structures in different plant species. This molecular architecture is not a coincidence but is tailored to create a particular desirable functionality. LÄS MER

  7. 5. High-Performance Composites from Modified Wood Fiber

    Författare :Mats Westin; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Kraft lignin; fiberboard; lignocellulosic fiber; durability; wood fiber; mechanical properties; dimensional stability; decay resistance; acetylation; composite;

    Sammanfattning : The objective of this work was to produce and evaluate high-performance wood fiber composites. High-performance was defined as: high dimensional stability and a high durability, including resistance to wood-decaying organisms (fungi, bacteria, and insects). LÄS MER