The use of natural fibres such as flax in composite materials is an expanding market sector. Variability potentially exists at many points in the “plant-composite continuum”. In this study, the influence of i) variety, ii) growth year, and iii) processing technique on the mechanical properties of composites was tested. Ten varieties of flax grown in two consecutive years were processed by the following techniques: i) twin-screw extrusion and injection moulding, ii) vacuum assisted resin transfer moulding (VARTM) and iii) pultrusion. These processes differed in the fibre length, fibre orientation and polymer used, and so differed overall in the severity of the fibre treatments.
The two repetitions of growing in two subsequent years showed a significant influence on the morphology of the raw fibre bundles and the composite properties processed with VARTM and pultrusion technique. The year effect was overlapped by the severe processing influence using twin-screw extrusion and injection moulding, where no influence of the growing year was detectable in the mechanical properties of the composites and the morphology of the fibre bundles extracted from the composites.
Although the use of different processes on the same plant material causes large differences in the mechanical properties of the composites, we could identify plant varieties that showed consistently above average and below average performance with all processing techniques and over two years. This knowledge can be used as a basis for further breeding of flax varieties optimised for composite reinforcement.
Fecha Publicación: 01/01/2017
Autor: Fita-Bravo, S. (AIMPLAS) ; Haag, K. ; Padovani, J. ; Trouvé, J.-P. ; Pineau, C. ; Hawkins, S. ; De Jong, H. ; Deyholos, M. K. ; Chabbert, B. ; Müssig, J. ; Beaugrand, J
Referencia: Industrial Crops and Products (ISSN 0926-6690), Vol. 98, (2017), pp. 1 - 9 .-