Search for dissertations about: "lignin structure"

Showing result 21 - 25 of 116 swedish dissertations containing the words lignin structure.

  2. 21. Bioprocessing, Structure and Material Properties of Arabinoxylans

    Author : Anders Höije; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; moisture content; biorefinery; Arabinoxylan; mechanical properties; chemical structure; isolation; film formation; oxygen permeability; enzymatic treatment;

    Abstract : This work has focused on using agriculture residues as raw material for new polymeric materials. Arabinoxylans have been isolated from barley husks and endosperm fiber using alkali extraction, and the chemical composition and detailed structure have been determined. READ MORE

  4. 22. Fundamental Aspects of Lignin Carbohydrate Complexes (LCC) : Mechanisms, Recalcitrance and Material concepts

    Author : Nicola Giummarella; Martin Lawoko; Gunnar Henriksson; Arthur J. Ragauskas; KTH; []
    Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; Lignin Carbohydrates Complexes; Phenyl Glycosides; Benzyl Ethers; Benzyl and γ-esters; Universal Mild Quantitative fractionation; LCC mechanism formation; Extracellular lignin; Dehydogenation polymer; Autohydrolysis; Recalcitrance; Acetylation role; HSQC; HMBC; HSQC-TOCSY; 13C; 31P NMR; Thioacidolysis-GC; SEC; Green; Biomimetic; One-pot-lignin functionalization; Lignin platform material.; Fiber- och polymervetenskap; Fibre and Polymer Science;

    Abstract : Covalent bonds between lignin and carbohydrates, forming a matrix referred to as lignin carbohydrate complexes (LCC), remain one of the most controversial topics in wood chemistry. A key issue is whether they are formed during chemical and mechanical pretreatments of the compact wood structure or actually present in wood prior to isolation. READ MORE

  5. 23. Effects of Cell Wall Structure on Tensile Properties of Hardwood : Effect of down-regulation of lignin on mechanical performance of transgenic hybrid aspen. Effect of chemical degradation on mechanical performance of archaeological oak from the Vasa ship

    Author : Ingela Bjurhager; Lars Berglund; Ulrike Wegst; KTH; []
    Keywords : tensile strength; transgenic hybrid aspen; lignin down-regulation; the Vasa ship; chemical degradation; longitudinell draghållfasthet; transgen hybridasp; ligninnedreglering; Vasaskeppet; kemisk nedbrytning; TECHNOLOGY; TEKNIKVETENSKAP;

    Abstract : Wood is a complex material and the mechanical properties are influencedby a number of structural parameters. The objective of this study has been toinvestigate the relationship between the structure and the mechanical propertiesof hardwood. Two levels were of special interest, viz. READ MORE

  6. 24. High strength paper from high yield pulps by means of hot-pressing

    Author : Tove Joelsson; Per Engstrand; Gunilla Pettersson; Anna Svedberg; Samuel Schabel; Mittuniversitetet; []
    Keywords : high yield pulp; hot-pressing; lignin; paper properties; wet strength;

    Abstract : AbstractHigh Yield Pulp (HYP), i.e. TMP, SGW or CTMP, is normally used in printing papers (News, SC and LWC) or in a middle layer on cardboard i.e. READ MORE

  7. 25. Ultrastructure of the Primary Cell Wall of Softwood Fibres Studied using Dynamic FT-IR Spectroscopy

    Author : Jasna Stevanic Srndovic; Lars Wågberg; Per M. Claesson; Paul Gatenholm; KTH; []
    Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; primary cell wall; polymer interactions; viscoelasticity; dynamic FT-IR spectroscopy; dynamic 2D FT-IR spectroscopy; cellulose; xyloglucan; pectin; protein; lignin; low degree sulphonation; cellulose allomorphs; Wood fibre and forest products; Träfiber- och virkeslära;

    Abstract : The primary cell wall is a complex multipolymer system whose composite structure has been mostly determined from chemical and biochemical studies. Although the primary cell wall serves a central role, with regard to the connective properties of fibres, knowledge about the interactions among the polymers, when it comes to the mechanical properties, is very limited. READ MORE