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Premium Influence of Lignin Type on the Mechanical Properties of Lignin Based Compounds
Nitz Hansjörg,
Semke Hinnerk,
Mülhaupt Rolf
Publication year2001
Publication title
macromolecular materials and engineering
Resource typeJournals
PublisherWILEY‐VCH Verlag GmbH
Abstract Several types of sulfur‐free lignins were melt compounded in a Werner & Pfleiderer twin screw extruder (ZSK 25) together with polyamide 11 (PA11), a biodegradable polyester (Ecoflex®) and a biodegradable polyesteramide (BAK®). Sulfur‐free lignins, precipitated from black liquors of alkaline pulping of annual plants, like sisal and abaca, were compared to a sulfur‐free lignin (Alcell™) obtained by organosolv wood pulping. Lignin content and lignin type were varied systematically in order to examine stress/strain characteristics and impact behavior. Compounds with lignins from annual plants showed similar or better mechanical properties in comparison to compounds with Alcell™ lignin. A polyamid 11 compound containing 30 wt.‐% abaca lignin gave a Young's modulus of 1 890 MPa, compared to 1 420 MPa for PA11 and a 28% increase of yield stress. The morphology of the lignin compounds was investigated by means of environmental scanning electron microscopy (ESEM) and transmission electron microscopy (TEM).
Subject(s)black liquor , chemical engineering , chemistry , composite material , engineering , lignin , materials science , metallurgy , organic chemistry , organosolv , plastics extrusion , polyester , sisal , sulfur
SCImago Journal Rank0.913

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