Beschreibung:
<jats:p>Purpose: of this paper was to develop and to characterize the mechanical behaviour
of a structural composite obtained from a bio-based polyurethane matrix reinforced with
fiberglass.
Design/methodology/approach: Castor oil and Kraft lignin-containing polyol was
applied for bio-based polyurethane synthesis. Structural composite was obtained by
reinforcing this renewable source bio-based polymer with fiberglass mat. Polyester
resin composite was also obtained for comparison, following the same process and
reinforcement conditions. Mechanical characterization was carried out through uniaxial
tensile, flexural strength, Izod impact tests and additionally scanning electron microscopy
(MEV).
Findings: Bio-based polyurethane composite was obtained and presented higher ultimate
tensile strength (UTS) and equivalent impact resistance in comparison to polyester matrix
composite.
Research limitations/implications: Effects of Kraft lignin and fiberglass contents
changing on mechanical properties might be investigated in future researches.
Practical implications: Revalorization of Kraft lignin. 50 million tons of lignin are produced
worldwide every year as by-product of pulp and paper manufacturing. The most part of this
Kraft lignin is currently burned for energy generation.
Originality/value: Results indicated the possibility of reusing this industrial wasted
by-product at large scale as polymeric matrix for structural composite, in which high UTS
and impact resistance are required.
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