Abstract This study investigated how lignin—used as a
natural adhesion promoter in biodegradable, thermoplastic
cotton fibre-reinforced composites—influences the composites’
mechanical properties. Composites with fibre mass
proportions of 40% were produced by compression moulding.
Poly(lactic acid) (PLA), a biopolymer, served as matrix.
Cotton/PLA composites with and without lignin content
were manufactured. As reference samples of bast fibrereinforced
composites, kenaf/PLA composites were produced
under the same conditions. The composites were
tested for stiffness, tensile strength, elongation at break and
impact strength. Fractured surfaces were analysed using
scanning electron microscopy (SEM). The results of the
composite investigations showed that the addition of lignin
has an influence on the cotton/PLA composite characteristics.
SEM investigations showed that the adhesion between
fibre and matrix could be improved by the addition of lignin.
Tensile characteristics like tensile strength and Young’s
modulus could be improved clearly, while the impact properties
were decreased
Abstract This study investigated how lignin—used as anatural adhesion promoter in biodegradable, thermoplasticcotton fibre-reinforced composites—influences the composites’mechanical properties. Composites with fibre massproportions of 40% were produced by compression moulding.Poly(lactic acid) (PLA), a biopolymer, served as matrix.Cotton/PLA composites with and without lignin contentwere manufactured. As reference samples of bast fibrereinforcedcomposites, kenaf/PLA composites were producedunder the same conditions. The composites weretested for stiffness, tensile strength, elongation at break andimpact strength. Fractured surfaces were analysed usingscanning electron microscopy (SEM). The results of thecomposite investigations showed that the addition of ligninhas an influence on the cotton/PLA composite characteristics.SEM investigations showed that the adhesion betweenfibre and matrix could be improved by the addition of lignin.Tensile characteristics like tensile strength and Young’smodulus could be improved clearly, while the impact propertieswere decreased
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