Lignin-xylaric acid-polyurethane-based polymer network systems: Preparation and characterization

Helinä Pohjanlehto (Corresponding Author), Harri Setälä, D.E. Kiely, A.G. Mcdonald

    Research output: Contribution to journalArticleScientificpeer-review

    23 Citations (Scopus)

    Abstract

    Polyurethanes (PU) were synthesized from lignin by first preparing a prepolymer from esterified sugar‐based trihydroxyl compound xylaric acid and a 20 mol % excess of methylene diphenyl diisocyanate. The prepolymer was crosslinked with 5, 10, and 15 wt % of an industrial soda lignin, and polyethylene glycol was used to bring soft segments into the material structure. The total amount of bio‐based starting materials was as high as 35%. Evidence for the reaction between the prepolymer and lignin was observed using Fourier transform infrared spectroscopic analysis and 13C nuclear magnetic resonance spectroscopy. The thermal properties of the materials were investigated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The mechanical and viscoelastic properties of the materials were determined by dynamic mechanical analysis (DMA). The glass transition temperatures (Tg) obtained from DSC and DMA showed a trend of increasing Tg with the increasing amount of lignin. A similar trend was observed with TGA for the increasing thermal stability up to 550oC with the increasing amount of lignin. The lignin‐polyurethanes obtained were stiff materials showing high Young's modulus values.
    Original languageEnglish
    Article number39714
    JournalJournal of Applied Polymer Science
    Volume131
    Issue number1
    DOIs
    Publication statusPublished - 2013
    MoE publication typeA1 Journal article-refereed

    Keywords

    • crosslinking
    • polysaccharides
    • polyurethanes

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