Application of lignin as natural adhesion promoter in cotton fibre-reinforced poly(lactic acid) (PLA) composites |
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Authors: | Nina Graupner |
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Affiliation: | (1) Faserinstitut Bremen e.V. (FIBRE), Am Biologischen Garten 2, 28359 Bremen, Germany;(2) Present address: University of Applied Sciences Bremen, Faculty 5 – Biomimetics/Biological Materials, Neustadtswall 30, 28199 Bremen, Germany |
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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 fibre-reinforced 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. |
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