Synthetic polymers are widely used to make a variety of products. However, they are not easily degradable and thus negatively affect the ecosystem. In recent years, biodegradable polymers have gained attention due to a number of advantages, chiefly the fact they can be obtained from renewable sources and they reduce the environmental impact. However, their perfor- mance in terms of mechanical and thermal properties is not as good as conventional polymers. The addition of fillers aims to enhance mechanical performance and facilitate processing of these materials [1–3]. In particular, the literature contains various articles describing the preparation and characterization of nano and microcomposites of biodegradable polymers [3–7]. The main fillers used to prepare these kinds of composites are vegetal fibers and layered silicates, especially montmorillonite (MMT), hectorite and saponite [3–5].