The Natural Growth of CaCO3 Crystals on Hemp Yarns: A Morphology Analysis and the Mechanical Effects on Composites

Author:

Drouhet Quentin1ORCID,Barbière Romain1,Touchard Fabienne1ORCID,Chocinski-Arnault Laurence1,Mellier David1

Affiliation:

1. Department of Physics and Mechanics of Materials, Pprime Institute, CNRS-ENSMA-University of Poitiers, ISAE-ENSMA 1 Avenue Clément Ader, 86961 Futuroscope Chasseneuil, France

Abstract

Plant fibres are promising candidates to replace synthetic fibres in polymer matrix composites. However, there is still an important issue to overcome: the poor quality of adhesion at the fibre/matrix interface. Many surface treatments of plant fibres have been developed, most of them based on non-environmentally friendly processes. In this paper, a 100% natural treatment is proposed. Hemp yarns are immersed in tap water until the natural growth of limestone beads attached to their surface occurs. The morphology analysis reveals that these calcium carbonate crystals have a nanoneedle architecture, with hemp fibres acting as nucleators for these highly ordered coral-like structures. Tensile tests on ±45° woven hemp/epoxy composites show that the presence of CaCO3 beads improves the adhesion quality of the fibre/matrix interface and, therefore, increases Young’s modulus value.

Funder

EQUIPEX GAP

EUR INTREE

Publisher

MDPI AG

Subject

Mechanics of Materials,Biomaterials,Civil and Structural Engineering,Ceramics and Composites

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