Sökning: "lignin reactivity"

Hittade 4 uppsatser innehållade orden lignin reactivity.

  1. 1. Lignin modification for higher reactivity towards epoxides

    Master-uppsats, KTH/Fiber- och polymerteknologi

    Författare :Filip Rynkiewicz; [2023]
    Nyckelord :Lignin; modification; reactivity; epoxide; oxidation; Lignin; modifikation; reaktivitet; epoxid; oxidation;

    Sammanfattning : Fem metoder har använts för att modifiera barrvedslignin med syftet att öka reaktiviteten av ligninet mot epoxidgrupper. Ligninprover analyserades med NMR och FTIR medan reaktivitet var mätt genom reometri. Metoder som ökade mängden karboxylsyragrupper på ligninet minskade ligninets reaktivitet. LÄS MER

  3. 2. Synthesis and Investigation of Nitrile-Containing Polymers Inspired by Lignin

    Master-uppsats, Lunds universitet/Centrum för analys och syntes

    Författare :Tobias Lindborg; [2022]
    Nyckelord :Lignin; Polymer; Renewable; Bioresource; Glass transition temperature; Nitrile; Polymer technology; Chemistry; Technology and Engineering;

    Sammanfattning : The lignin-inspired derivatives coniferyl aldehyde and sinapyl aldehyde were used to prepare nitrile-containing methacrylate monomers with the aim to synthesize bio-based polymers exhibiting high glass transition temperatures (Tgs). The aldehydes were initially transformed to the corresponding nitriles and then underwent methacrylation before being polymerised by free-radical polymerisation. LÄS MER

  4. 3. Synthetic Functionalization of Colloidal Lignin Particles for Wood Adhesive Applications

    Master-uppsats, KTH/Skolan för kemi, bioteknologi och hälsa (CBH)

    Författare :Fusi Alexander Deen; [2020]
    Nyckelord :Lignin; Colloidal Lignin Particles; Glyoxal; CLPs; adhesive; Lignin; kolloidala ligninpartiklar; glyoxal; CLP; lim;

    Sammanfattning : Functionalizable spherical colloidal lignin particles (CLPs) represent a valuable asset for the valorization of lignin side-streams from the pulp industry. The spherical structure allows for the circumvention of the heterogeneous and poorly dispersible structure of the biopolymer. LÄS MER

  5. 4. Chemical methods to increase the reactivity  of lignin : In the context of green chemistry  and education for sustainable development

    Uppsats för yrkesexamina på avancerad nivå, KTH/Skolan för teknikvetenskaplig kommunikation och lärande (ECE)

    Författare :Erica Birgersson; [2015]
    Nyckelord :Biomaterial; lignin reactivity; thiol mediated demethylation; iodine mediated demethylation; green chemistry; SNl-fall.; Biomaterial; lignin reaktivitet; tiol medierad demetylering; jod medierad demetylering; gron kemi; SNI-fall;

    Sammanfattning : The research  concerning lignin in high value applications has increased  during the last years due to its renewability and availability in the black liquor from pulp mills. Today  the major part of kraft lignin found  in the black liquor is used as fuel to gain energy  in the recovery boiler. LÄS MER