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 performance 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].