This paper focuses on the analysis of thermal and mechanical properties of novel biocomposites of Alfa
fibers dispersed in a bioplastic of the Mater-Bi type in relation with their morphology. These biocomposites
obtained by twin screw extrusion were injection molded. Mater-Bi is a commercial biodegradable
thermoplastic based on poly(butylene terephthalate-co-butylene adipate) and starch. Raw and alkali
treated Alfa fibers were used as reinforcement. Thermal analysis showed significant increase of the
crystallization rate with the incorporation of Alfa fibers and enhancement of thermal stability by alkali
treatment. Modulus and tensile strength of biocomposites also increased whereas toughness and
elongation at break decreased upon increasing the fibers fraction. Scanning electron microscopy (SEM)
on fractured surfaces indicated good adhesion between the matrix and the treated or untreated Alfa fibers.
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