In this article, the microstructures of sisal fiber composites were analyzed. The porous structure of sisal fiber, crystalline morphology of matrix and fiber distribution in composites were characterized by Voronoi diagram. The tensile properties of composites were also measured. The results show that the maleated polypropylene compatibilizer can accelerate the formation of transcrystalline interface between fibers and matrix. Improvement of interface adhesion and reduction of fiber polarity can lead to better fiber distribution in the matrix. The tensile moduli of composites are related to the degree of fiber distribution.
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