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In this work several types of flax were used as reinforcement in poly(propylene) based unidirectional composites. These flax types included non-treated as well as treated (boiled) samples. On the other hand, two types of poly(propylene) were used as matrix: non-modified poly(propylene) (PP), and maleic anhydride modified poly(propylene) (MAA-PP). The influence of both fibre and matrix modification was studied through mechanical (flexural) and physical (density, sorption, and drying) tests. Combination of boiled flax with MAA-PP proved to yield the best mechanical properties, combined with good physical properties. A 100% stress transfer between fibre and matrix could be calculated in this optimised case. Interlaminar shear strength tests were done in order to confirm this improved fibre-matrix adhesion.
Velde et al. (Sun,) studied this question.